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7 | TFile.Reader (Hadoop 0.20.1 API) |
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79 | SUMMARY: <A HREF="#nested_class_summary">NESTED</A> | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD> |
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89 | <H2> |
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90 | <FONT SIZE="-1"> |
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91 | org.apache.hadoop.io.file.tfile</FONT> |
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92 | <BR> |
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93 | Class TFile.Reader</H2> |
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94 | <PRE> |
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95 | <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A> |
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96 | <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.io.file.tfile.TFile.Reader</B> |
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97 | </PRE> |
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98 | <DL> |
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99 | <DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></DD> |
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100 | </DL> |
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101 | <DL> |
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102 | <DT><B>Enclosing class:</B><DD><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.html" title="class in org.apache.hadoop.io.file.tfile">TFile</A></DD> |
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103 | </DL> |
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104 | <HR> |
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105 | <DL> |
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106 | <DT><PRE>public static class <B>TFile.Reader</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></DL> |
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107 | </PRE> |
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108 | |
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109 | <P> |
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110 | TFile Reader. Users may only read TFiles by creating TFile.Reader.Scanner. |
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111 | objects. A scanner may scan the whole TFile (<A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner()"><CODE>createScanner()</CODE></A> |
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112 | ) , a portion of TFile based on byte offsets ( |
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113 | <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner(long, long)"><CODE>createScanner(long, long)</CODE></A>), or a portion of TFile with keys |
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114 | fall in a certain key range (for sorted TFile only, |
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115 | <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner(byte[], byte[])"><CODE>createScanner(byte[], byte[])</CODE></A> or |
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116 | <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner(org.apache.hadoop.io.file.tfile.RawComparable, org.apache.hadoop.io.file.tfile.RawComparable)"><CODE>createScanner(RawComparable, RawComparable)</CODE></A>). |
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117 | <P> |
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118 | |
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119 | <P> |
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120 | <HR> |
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121 | |
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122 | <P> |
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123 | <!-- ======== NESTED CLASS SUMMARY ======== --> |
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124 | |
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125 | <A NAME="nested_class_summary"><!-- --></A> |
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126 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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127 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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128 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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129 | <B>Nested Class Summary</B></FONT></TH> |
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130 | </TR> |
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131 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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132 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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133 | <CODE>static class</CODE></FONT></TD> |
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134 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A></B></CODE> |
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135 | |
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136 | <BR> |
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137 | The TFile Scanner.</TD> |
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138 | </TR> |
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139 | </TABLE> |
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140 | |
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141 | <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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142 | |
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143 | <A NAME="constructor_summary"><!-- --></A> |
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144 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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145 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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146 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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147 | <B>Constructor Summary</B></FONT></TH> |
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148 | </TR> |
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149 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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150 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#TFile.Reader(org.apache.hadoop.fs.FSDataInputStream, long, org.apache.hadoop.conf.Configuration)">TFile.Reader</A></B>(<A HREF="../../../../../../org/apache/hadoop/fs/FSDataInputStream.html" title="class in org.apache.hadoop.fs">FSDataInputStream</A> fsdis, |
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151 | long fileLength, |
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152 | <A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> conf)</CODE> |
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153 | |
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154 | <BR> |
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155 | Constructor</TD> |
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156 | </TR> |
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157 | </TABLE> |
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158 | |
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159 | <!-- ========== METHOD SUMMARY =========== --> |
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160 | |
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161 | <A NAME="method_summary"><!-- --></A> |
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162 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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163 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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164 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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165 | <B>Method Summary</B></FONT></TH> |
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166 | </TR> |
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167 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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168 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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169 | <CODE> void</CODE></FONT></TD> |
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170 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#close()">close</A></B>()</CODE> |
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171 | |
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172 | <BR> |
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173 | Close the reader.</TD> |
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174 | </TR> |
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175 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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176 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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177 | <CODE> <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A></CODE></FONT></TD> |
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178 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner()">createScanner</A></B>()</CODE> |
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179 | |
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180 | <BR> |
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181 | Get a scanner than can scan the whole TFile.</TD> |
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182 | </TR> |
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183 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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184 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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185 | <CODE> <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A></CODE></FONT></TD> |
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186 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner(byte[], byte[])">createScanner</A></B>(byte[] beginKey, |
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187 | byte[] endKey)</CODE> |
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188 | |
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189 | <BR> |
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190 | Get a scanner that covers a portion of TFile based on keys.</TD> |
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191 | </TR> |
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192 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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193 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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194 | <CODE> <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A></CODE></FONT></TD> |
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195 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner(long, long)">createScanner</A></B>(long offset, |
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196 | long length)</CODE> |
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197 | |
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198 | <BR> |
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199 | Get a scanner that covers a portion of TFile based on byte offsets.</TD> |
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200 | </TR> |
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201 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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202 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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203 | <CODE> <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A></CODE></FONT></TD> |
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204 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner(org.apache.hadoop.io.file.tfile.RawComparable, org.apache.hadoop.io.file.tfile.RawComparable)">createScanner</A></B>(<A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A> beginKey, |
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205 | <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A> endKey)</CODE> |
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206 | |
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207 | <BR> |
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208 | Get a scanner that covers a specific key range.</TD> |
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209 | </TR> |
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210 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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211 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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212 | <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A><<A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A>></CODE></FONT></TD> |
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213 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getComparator()">getComparator</A></B>()</CODE> |
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214 | |
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215 | <BR> |
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216 | Get an instance of the RawComparator that is constructed based on the |
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217 | string comparator representation.</TD> |
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218 | </TR> |
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219 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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220 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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221 | <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD> |
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222 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getComparatorName()">getComparatorName</A></B>()</CODE> |
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223 | |
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224 | <BR> |
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225 | Get the string representation of the comparator.</TD> |
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226 | </TR> |
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227 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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228 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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229 | <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A><<A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.Entry.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner.Entry</A>></CODE></FONT></TD> |
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230 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getEntryComparator()">getEntryComparator</A></B>()</CODE> |
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231 | |
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232 | <BR> |
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233 | Get a Comparator object to compare Entries.</TD> |
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234 | </TR> |
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235 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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236 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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237 | <CODE> long</CODE></FONT></TD> |
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238 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getEntryCount()">getEntryCount</A></B>()</CODE> |
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239 | |
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240 | <BR> |
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241 | Get the number of key-value pair entries in TFile.</TD> |
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242 | </TR> |
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243 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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244 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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245 | <CODE> <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A></CODE></FONT></TD> |
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246 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getFirstKey()">getFirstKey</A></B>()</CODE> |
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247 | |
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248 | <BR> |
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249 | Get the first key in the TFile.</TD> |
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250 | </TR> |
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251 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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252 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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253 | <CODE> <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A></CODE></FONT></TD> |
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254 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getKeyNear(long)">getKeyNear</A></B>(long offset)</CODE> |
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255 | |
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256 | <BR> |
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257 | Get a sample key that is within a block whose starting offset is greater |
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258 | than or equal to the specified offset.</TD> |
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259 | </TR> |
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260 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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261 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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262 | <CODE> <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A></CODE></FONT></TD> |
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263 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getLastKey()">getLastKey</A></B>()</CODE> |
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264 | |
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265 | <BR> |
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266 | Get the last key in the TFile.</TD> |
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267 | </TR> |
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268 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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269 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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270 | <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io">DataInputStream</A></CODE></FONT></TD> |
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271 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getMetaBlock(java.lang.String)">getMetaBlock</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> name)</CODE> |
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272 | |
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273 | <BR> |
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274 | Stream access to a meta block.``</TD> |
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275 | </TR> |
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276 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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277 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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278 | <CODE> boolean</CODE></FONT></TD> |
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279 | <TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#isSorted()">isSorted</A></B>()</CODE> |
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280 | |
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281 | <BR> |
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282 | Is the TFile sorted?</TD> |
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283 | </TR> |
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284 | </TABLE> |
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285 | <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> |
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286 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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287 | <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> |
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288 | <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH> |
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289 | </TR> |
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290 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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291 | <TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD> |
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292 | </TR> |
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293 | </TABLE> |
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294 | |
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295 | <P> |
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296 | |
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297 | <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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298 | |
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299 | <A NAME="constructor_detail"><!-- --></A> |
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300 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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301 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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302 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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303 | <B>Constructor Detail</B></FONT></TH> |
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304 | </TR> |
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305 | </TABLE> |
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306 | |
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307 | <A NAME="TFile.Reader(org.apache.hadoop.fs.FSDataInputStream, long, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3> |
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308 | TFile.Reader</H3> |
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309 | <PRE> |
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310 | public <B>TFile.Reader</B>(<A HREF="../../../../../../org/apache/hadoop/fs/FSDataInputStream.html" title="class in org.apache.hadoop.fs">FSDataInputStream</A> fsdis, |
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311 | long fileLength, |
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312 | <A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> conf) |
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313 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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314 | <DL> |
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315 | <DD>Constructor |
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316 | <P> |
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317 | <DL> |
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318 | <DT><B>Parameters:</B><DD><CODE>fsdis</CODE> - FS input stream of the TFile.<DD><CODE>fileLength</CODE> - The length of TFile. This is required because we have no easy |
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319 | way of knowing the actual size of the input file through the |
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320 | File input stream.<DD><CODE>conf</CODE> - |
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321 | <DT><B>Throws:</B> |
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322 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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323 | </DL> |
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324 | |
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325 | <!-- ============ METHOD DETAIL ========== --> |
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326 | |
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327 | <A NAME="method_detail"><!-- --></A> |
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328 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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329 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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330 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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331 | <B>Method Detail</B></FONT></TH> |
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332 | </TR> |
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333 | </TABLE> |
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334 | |
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335 | <A NAME="close()"><!-- --></A><H3> |
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336 | close</H3> |
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337 | <PRE> |
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338 | public void <B>close</B>() |
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339 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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340 | <DL> |
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341 | <DD>Close the reader. The state of the Reader object is undefined after |
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342 | close. Calling close() for multiple times has no effect. |
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343 | <P> |
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344 | <DD><DL> |
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345 | <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true#close()" title="class or interface in java.io">close</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></CODE></DL> |
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346 | </DD> |
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347 | <DD><DL> |
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348 | |
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349 | <DT><B>Throws:</B> |
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350 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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351 | </DD> |
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352 | </DL> |
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353 | <HR> |
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354 | |
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355 | <A NAME="getComparatorName()"><!-- --></A><H3> |
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356 | getComparatorName</H3> |
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357 | <PRE> |
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358 | public <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>getComparatorName</B>()</PRE> |
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359 | <DL> |
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360 | <DD>Get the string representation of the comparator. |
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361 | <P> |
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362 | <DD><DL> |
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363 | </DL> |
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364 | </DD> |
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365 | <DD><DL> |
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366 | |
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367 | <DT><B>Returns:</B><DD>If the TFile is not sorted by keys, an empty string will be |
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368 | returned. Otherwise, the actual comparator string that is |
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369 | provided during the TFile creation time will be returned.</DL> |
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370 | </DD> |
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371 | </DL> |
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372 | <HR> |
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373 | |
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374 | <A NAME="isSorted()"><!-- --></A><H3> |
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375 | isSorted</H3> |
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376 | <PRE> |
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377 | public boolean <B>isSorted</B>()</PRE> |
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378 | <DL> |
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379 | <DD>Is the TFile sorted? |
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380 | <P> |
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381 | <DD><DL> |
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382 | </DL> |
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383 | </DD> |
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384 | <DD><DL> |
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385 | |
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386 | <DT><B>Returns:</B><DD>true if TFile is sorted.</DL> |
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387 | </DD> |
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388 | </DL> |
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389 | <HR> |
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390 | |
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391 | <A NAME="getEntryCount()"><!-- --></A><H3> |
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392 | getEntryCount</H3> |
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393 | <PRE> |
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394 | public long <B>getEntryCount</B>()</PRE> |
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395 | <DL> |
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396 | <DD>Get the number of key-value pair entries in TFile. |
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397 | <P> |
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398 | <DD><DL> |
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399 | </DL> |
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400 | </DD> |
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401 | <DD><DL> |
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402 | |
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403 | <DT><B>Returns:</B><DD>the number of key-value pairs in TFile</DL> |
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404 | </DD> |
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405 | </DL> |
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406 | <HR> |
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407 | |
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408 | <A NAME="getFirstKey()"><!-- --></A><H3> |
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409 | getFirstKey</H3> |
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410 | <PRE> |
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411 | public <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A> <B>getFirstKey</B>() |
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412 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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413 | <DL> |
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414 | <DD>Get the first key in the TFile. |
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415 | <P> |
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416 | <DD><DL> |
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417 | </DL> |
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418 | </DD> |
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419 | <DD><DL> |
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420 | |
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421 | <DT><B>Returns:</B><DD>The first key in the TFile. |
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422 | <DT><B>Throws:</B> |
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423 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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424 | </DD> |
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425 | </DL> |
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426 | <HR> |
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427 | |
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428 | <A NAME="getLastKey()"><!-- --></A><H3> |
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429 | getLastKey</H3> |
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430 | <PRE> |
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431 | public <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A> <B>getLastKey</B>() |
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432 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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433 | <DL> |
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434 | <DD>Get the last key in the TFile. |
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435 | <P> |
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436 | <DD><DL> |
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437 | </DL> |
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438 | </DD> |
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439 | <DD><DL> |
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440 | |
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441 | <DT><B>Returns:</B><DD>The last key in the TFile. |
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442 | <DT><B>Throws:</B> |
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443 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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444 | </DD> |
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445 | </DL> |
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446 | <HR> |
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447 | |
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448 | <A NAME="getEntryComparator()"><!-- --></A><H3> |
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449 | getEntryComparator</H3> |
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450 | <PRE> |
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451 | public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A><<A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.Entry.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner.Entry</A>> <B>getEntryComparator</B>()</PRE> |
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452 | <DL> |
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453 | <DD>Get a Comparator object to compare Entries. It is useful when you want |
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454 | stores the entries in a collection (such as PriorityQueue) and perform |
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455 | sorting or comparison among entries based on the keys without copying out |
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456 | the key. |
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457 | <P> |
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458 | <DD><DL> |
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459 | </DL> |
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460 | </DD> |
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461 | <DD><DL> |
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462 | |
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463 | <DT><B>Returns:</B><DD>An Entry Comparator..</DL> |
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464 | </DD> |
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465 | </DL> |
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466 | <HR> |
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467 | |
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468 | <A NAME="getComparator()"><!-- --></A><H3> |
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469 | getComparator</H3> |
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470 | <PRE> |
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471 | public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A><<A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A>> <B>getComparator</B>()</PRE> |
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472 | <DL> |
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473 | <DD>Get an instance of the RawComparator that is constructed based on the |
---|
474 | string comparator representation. |
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475 | <P> |
---|
476 | <DD><DL> |
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477 | </DL> |
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478 | </DD> |
---|
479 | <DD><DL> |
---|
480 | |
---|
481 | <DT><B>Returns:</B><DD>a Comparator that can compare RawComparable's.</DL> |
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482 | </DD> |
---|
483 | </DL> |
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484 | <HR> |
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485 | |
---|
486 | <A NAME="getMetaBlock(java.lang.String)"><!-- --></A><H3> |
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487 | getMetaBlock</H3> |
---|
488 | <PRE> |
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489 | public <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io">DataInputStream</A> <B>getMetaBlock</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> name) |
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490 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A>, |
---|
491 | <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/MetaBlockDoesNotExist.html" title="class in org.apache.hadoop.io.file.tfile">MetaBlockDoesNotExist</A></PRE> |
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492 | <DL> |
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493 | <DD>Stream access to a meta block.`` |
---|
494 | <P> |
---|
495 | <DD><DL> |
---|
496 | </DL> |
---|
497 | </DD> |
---|
498 | <DD><DL> |
---|
499 | <DT><B>Parameters:</B><DD><CODE>name</CODE> - The name of the meta block. |
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500 | <DT><B>Returns:</B><DD>The input stream. |
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501 | <DT><B>Throws:</B> |
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502 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE> - on I/O error. |
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503 | <DD><CODE><A HREF="../../../../../../org/apache/hadoop/io/file/tfile/MetaBlockDoesNotExist.html" title="class in org.apache.hadoop.io.file.tfile">MetaBlockDoesNotExist</A></CODE> - If the meta block with the name does not exist.</DL> |
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504 | </DD> |
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505 | </DL> |
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506 | <HR> |
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507 | |
---|
508 | <A NAME="getKeyNear(long)"><!-- --></A><H3> |
---|
509 | getKeyNear</H3> |
---|
510 | <PRE> |
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511 | public <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A> <B>getKeyNear</B>(long offset) |
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512 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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513 | <DL> |
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514 | <DD>Get a sample key that is within a block whose starting offset is greater |
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515 | than or equal to the specified offset. |
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516 | <P> |
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517 | <DD><DL> |
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518 | </DL> |
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519 | </DD> |
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520 | <DD><DL> |
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521 | <DT><B>Parameters:</B><DD><CODE>offset</CODE> - The file offset. |
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522 | <DT><B>Returns:</B><DD>the key that fits the requirement; or null if no such key exists |
---|
523 | (which could happen if the offset is close to the end of the |
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524 | TFile). |
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525 | <DT><B>Throws:</B> |
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526 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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527 | </DD> |
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528 | </DL> |
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529 | <HR> |
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530 | |
---|
531 | <A NAME="createScanner()"><!-- --></A><H3> |
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532 | createScanner</H3> |
---|
533 | <PRE> |
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534 | public <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A> <B>createScanner</B>() |
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535 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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536 | <DL> |
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537 | <DD>Get a scanner than can scan the whole TFile. |
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538 | <P> |
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539 | <DD><DL> |
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540 | </DL> |
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541 | </DD> |
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542 | <DD><DL> |
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543 | |
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544 | <DT><B>Returns:</B><DD>The scanner object. A valid Scanner is always returned even if |
---|
545 | the TFile is empty. |
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546 | <DT><B>Throws:</B> |
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547 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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548 | </DD> |
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549 | </DL> |
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550 | <HR> |
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551 | |
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552 | <A NAME="createScanner(long, long)"><!-- --></A><H3> |
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553 | createScanner</H3> |
---|
554 | <PRE> |
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555 | public <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A> <B>createScanner</B>(long offset, |
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556 | long length) |
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557 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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558 | <DL> |
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559 | <DD>Get a scanner that covers a portion of TFile based on byte offsets. |
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560 | <P> |
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561 | <DD><DL> |
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562 | </DL> |
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563 | </DD> |
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564 | <DD><DL> |
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565 | <DT><B>Parameters:</B><DD><CODE>offset</CODE> - The beginning byte offset in the TFile.<DD><CODE>length</CODE> - The length of the region. |
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566 | <DT><B>Returns:</B><DD>The actual coverage of the returned scanner tries to match the |
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567 | specified byte-region but always round up to the compression |
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568 | block boundaries. It is possible that the returned scanner |
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569 | contains zero key-value pairs even if length is positive. |
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570 | <DT><B>Throws:</B> |
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571 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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572 | </DD> |
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573 | </DL> |
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574 | <HR> |
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575 | |
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576 | <A NAME="createScanner(byte[], byte[])"><!-- --></A><H3> |
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577 | createScanner</H3> |
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578 | <PRE> |
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579 | public <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A> <B>createScanner</B>(byte[] beginKey, |
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580 | byte[] endKey) |
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581 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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582 | <DL> |
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583 | <DD>Get a scanner that covers a portion of TFile based on keys. |
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584 | <P> |
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585 | <DD><DL> |
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586 | </DL> |
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587 | </DD> |
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588 | <DD><DL> |
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589 | <DT><B>Parameters:</B><DD><CODE>beginKey</CODE> - Begin key of the scan (inclusive). If null, scan from the first |
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590 | key-value entry of the TFile.<DD><CODE>endKey</CODE> - End key of the scan (exclusive). If null, scan up to the last |
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591 | key-value entry of the TFile. |
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592 | <DT><B>Returns:</B><DD>The actual coverage of the returned scanner will cover all keys |
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593 | greater than or equal to the beginKey and less than the endKey. |
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594 | <DT><B>Throws:</B> |
---|
595 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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596 | </DD> |
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597 | </DL> |
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598 | <HR> |
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599 | |
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600 | <A NAME="createScanner(org.apache.hadoop.io.file.tfile.RawComparable, org.apache.hadoop.io.file.tfile.RawComparable)"><!-- --></A><H3> |
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601 | createScanner</H3> |
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602 | <PRE> |
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603 | public <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</A> <B>createScanner</B>(<A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A> beginKey, |
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604 | <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</A> endKey) |
---|
605 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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606 | <DL> |
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607 | <DD>Get a scanner that covers a specific key range. |
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608 | <P> |
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609 | <DD><DL> |
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610 | </DL> |
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611 | </DD> |
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612 | <DD><DL> |
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613 | <DT><B>Parameters:</B><DD><CODE>beginKey</CODE> - Begin key of the scan (inclusive). If null, scan from the first |
---|
614 | key-value entry of the TFile.<DD><CODE>endKey</CODE> - End key of the scan (exclusive). If null, scan up to the last |
---|
615 | key-value entry of the TFile. |
---|
616 | <DT><B>Returns:</B><DD>The actual coverage of the returned scanner will cover all keys |
---|
617 | greater than or equal to the beginKey and less than the endKey. |
---|
618 | <DT><B>Throws:</B> |
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619 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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620 | </DD> |
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621 | </DL> |
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622 | <!-- ========= END OF CLASS DATA ========= --> |
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623 | <HR> |
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624 | |
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625 | |
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626 | <!-- ======= START OF BOTTOM NAVBAR ====== --> |
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627 | <A NAME="navbar_bottom"><!-- --></A> |
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628 | <A HREF="#skip-navbar_bottom" title="Skip navigation links"></A> |
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629 | <TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""> |
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630 | <TR> |
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631 | <TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> |
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632 | <A NAME="navbar_bottom_firstrow"><!-- --></A> |
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633 | <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> |
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634 | <TR ALIGN="center" VALIGN="top"> |
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635 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> |
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636 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> |
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637 | <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> |
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638 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/TFile.Reader.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> |
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639 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> |
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640 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> |
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641 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> |
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642 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> |
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643 | </TR> |
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644 | </TABLE> |
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645 | </TD> |
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646 | <TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM> |
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647 | </EM> |
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648 | </TD> |
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649 | </TR> |
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650 | |
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651 | <TR> |
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652 | <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> |
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653 | <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.html" title="class in org.apache.hadoop.io.file.tfile"><B>PREV CLASS</B></A> |
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654 | <A HREF="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile"><B>NEXT CLASS</B></A></FONT></TD> |
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655 | <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> |
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656 | <A HREF="../../../../../../index.html?org/apache/hadoop/io/file/tfile/TFile.Reader.html" target="_top"><B>FRAMES</B></A> |
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657 | <A HREF="TFile.Reader.html" target="_top"><B>NO FRAMES</B></A> |
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658 | <SCRIPT type="text/javascript"> |
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659 | <!-- |
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660 | if(window==top) { |
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661 | document.writeln('<A HREF="../../../../../../allclasses-noframe.html"><B>All Classes</B></A>'); |
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662 | } |
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663 | //--> |
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664 | </SCRIPT> |
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665 | <NOSCRIPT> |
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666 | <A HREF="../../../../../../allclasses-noframe.html"><B>All Classes</B></A> |
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667 | </NOSCRIPT> |
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668 | |
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669 | |
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670 | </FONT></TD> |
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671 | </TR> |
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672 | <TR> |
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673 | <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> |
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674 | SUMMARY: <A HREF="#nested_class_summary">NESTED</A> | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD> |
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675 | <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> |
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676 | DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD> |
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677 | </TR> |
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678 | </TABLE> |
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679 | <A NAME="skip-navbar_bottom"></A> |
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680 | <!-- ======== END OF BOTTOM NAVBAR ======= --> |
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681 | |
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682 | <HR> |
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683 | Copyright © 2009 The Apache Software Foundation |
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684 | </BODY> |
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685 | </HTML> |
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