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7 | org.apache.hadoop.mapred (Hadoop 0.20.1 API) |
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81 | <HR> |
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82 | <H2> |
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83 | Package org.apache.hadoop.mapred |
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84 | </H2> |
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85 | A software framework for easily writing applications which process vast |
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86 | amounts of data (multi-terabyte data-sets) parallelly on large clusters |
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87 | (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant |
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88 | manner. |
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89 | <P> |
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90 | <B>See:</B> |
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91 | <BR> |
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92 | <A HREF="#package_description"><B>Description</B></A> |
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93 | <P> |
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94 | |
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95 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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96 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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97 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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98 | <B>Interface Summary</B></FONT></TH> |
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99 | </TR> |
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100 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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101 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat<K,V></A></B></TD> |
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102 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputFormat</CODE></A> instead.</I></TD> |
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103 | </TR> |
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104 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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105 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></B></TD> |
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106 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputSplit</CODE></A> instead.</I></TD> |
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107 | </TR> |
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108 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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109 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A></B></TD> |
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110 | <TD><B>Deprecated.</B></TD> |
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111 | </TR> |
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112 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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113 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Listener.html" title="interface in org.apache.hadoop.mapred">JobHistory.Listener</A></B></TD> |
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114 | <TD>Callback interface for reading back log events from JobHistory.</TD> |
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115 | </TR> |
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116 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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117 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper<K1,V1,K2,V2></A></B></TD> |
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118 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A> instead.</I></TD> |
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119 | </TR> |
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120 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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121 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapRunnable.html" title="interface in org.apache.hadoop.mapred">MapRunnable<K1,V1,K2,V2></A></B></TD> |
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122 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A> instead.</I></TD> |
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123 | </TR> |
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124 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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125 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector<K,V></A></B></TD> |
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126 | <TD>Collects the <code><key, value></code> pairs output by <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A>s |
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127 | and <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><CODE>Reducer</CODE></A>s.</TD> |
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128 | </TR> |
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129 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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130 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat<K,V></A></B></TD> |
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131 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/OutputFormat.html" title="class in org.apache.hadoop.mapreduce"><CODE>OutputFormat</CODE></A> instead.</I></TD> |
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132 | </TR> |
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133 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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134 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Partitioner.html" title="interface in org.apache.hadoop.mapred">Partitioner<K2,V2></A></B></TD> |
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135 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce"><CODE>Partitioner</CODE></A> instead.</I></TD> |
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136 | </TR> |
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137 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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138 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/RawKeyValueIterator.html" title="interface in org.apache.hadoop.mapred">RawKeyValueIterator</A></B></TD> |
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139 | <TD><code>RawKeyValueIterator</code> is an iterator used to iterate over |
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140 | the raw keys and values during sort/merge of intermediate data.</TD> |
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141 | </TR> |
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142 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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143 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader<K,V></A></B></TD> |
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144 | <TD><code>RecordReader</code> reads <key, value> pairs from an |
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145 | <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>.</TD> |
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146 | </TR> |
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147 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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148 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred">RecordWriter<K,V></A></B></TD> |
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149 | <TD><code>RecordWriter</code> writes the output <key, value> pairs |
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150 | to an output file.</TD> |
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151 | </TR> |
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152 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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153 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer<K2,V2,K3,V3></A></B></TD> |
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154 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce"><CODE>Reducer</CODE></A> instead.</I></TD> |
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155 | </TR> |
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156 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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157 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A></B></TD> |
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158 | <TD>A facility for Map-Reduce applications to report progress and update |
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159 | counters, status information etc.</TD> |
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160 | </TR> |
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161 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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162 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/RunningJob.html" title="interface in org.apache.hadoop.mapred">RunningJob</A></B></TD> |
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163 | <TD><code>RunningJob</code> is the user-interface to query for details on a |
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164 | running Map-Reduce job.</TD> |
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165 | </TR> |
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166 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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167 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.Filter.html" title="interface in org.apache.hadoop.mapred">SequenceFileInputFilter.Filter</A></B></TD> |
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168 | <TD>filter interface</TD> |
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169 | </TR> |
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170 | </TABLE> |
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171 | |
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172 | |
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173 | <P> |
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174 | |
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175 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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176 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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177 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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178 | <B>Class Summary</B></FONT></TH> |
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179 | </TR> |
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180 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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181 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/ClusterStatus.html" title="class in org.apache.hadoop.mapred">ClusterStatus</A></B></TD> |
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182 | <TD>Status information on the current state of the Map-Reduce cluster.</TD> |
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183 | </TR> |
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184 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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185 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.html" title="class in org.apache.hadoop.mapred">Counters</A></B></TD> |
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186 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/Counters.html" title="class in org.apache.hadoop.mapreduce"><CODE>Counters</CODE></A> instead.</I></TD> |
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187 | </TR> |
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188 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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189 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A></B></TD> |
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190 | <TD>A counter record, comprising its name and value.</TD> |
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191 | </TR> |
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192 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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193 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html" title="class in org.apache.hadoop.mapred">Counters.Group</A></B></TD> |
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194 | <TD><code>Group</code> of counters, comprising of counters from a particular |
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195 | counter <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang"><CODE>Enum</CODE></A> class.</TD> |
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196 | </TR> |
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197 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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198 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/DefaultJobHistoryParser.html" title="class in org.apache.hadoop.mapred">DefaultJobHistoryParser</A></B></TD> |
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199 | <TD>Default parser for job history files.</TD> |
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200 | </TR> |
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201 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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202 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat<K,V></A></B></TD> |
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203 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/FileInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>FileInputFormat</CODE></A> |
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204 | instead.</I></TD> |
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205 | </TR> |
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206 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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207 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileOutputCommitter.html" title="class in org.apache.hadoop.mapred">FileOutputCommitter</A></B></TD> |
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208 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/OutputCommitter.html" title="class in org.apache.hadoop.mapred"><CODE>OutputCommitter</CODE></A> that commits files specified |
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209 | in job output directory i.e.</TD> |
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210 | </TR> |
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211 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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212 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="class in org.apache.hadoop.mapred">FileOutputFormat<K,V></A></B></TD> |
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213 | <TD>A base class for <A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>OutputFormat</CODE></A>.</TD> |
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214 | </TR> |
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215 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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216 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileSplit.html" title="class in org.apache.hadoop.mapred">FileSplit</A></B></TD> |
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217 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/FileSplit.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>FileSplit</CODE></A> |
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218 | instead.</I></TD> |
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219 | </TR> |
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220 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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221 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/ID.html" title="class in org.apache.hadoop.mapred">ID</A></B></TD> |
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222 | <TD><B>Deprecated.</B></TD> |
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223 | </TR> |
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224 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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225 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/IsolationRunner.html" title="class in org.apache.hadoop.mapred">IsolationRunner</A></B></TD> |
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226 | <TD> </TD> |
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227 | </TR> |
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228 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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229 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred">JobClient</A></B></TD> |
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230 | <TD><code>JobClient</code> is the primary interface for the user-job to interact |
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231 | with the <A HREF="../../../../org/apache/hadoop/mapred/JobTracker.html" title="class in org.apache.hadoop.mapred"><CODE>JobTracker</CODE></A>.</TD> |
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232 | </TR> |
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233 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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234 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A></B></TD> |
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235 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf"><CODE>Configuration</CODE></A> instead</I></TD> |
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236 | </TR> |
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237 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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238 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobContext.html" title="class in org.apache.hadoop.mapred">JobContext</A></B></TD> |
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239 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce"><CODE>JobContext</CODE></A> instead.</I></TD> |
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240 | </TR> |
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241 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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242 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobEndNotifier.html" title="class in org.apache.hadoop.mapred">JobEndNotifier</A></B></TD> |
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243 | <TD> </TD> |
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244 | </TR> |
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245 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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246 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html" title="class in org.apache.hadoop.mapred">JobHistory</A></B></TD> |
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247 | <TD>Provides methods for writing to and reading from job history.</TD> |
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248 | </TR> |
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249 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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250 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.HistoryCleaner.html" title="class in org.apache.hadoop.mapred">JobHistory.HistoryCleaner</A></B></TD> |
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251 | <TD>Delete history files older than one month.</TD> |
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252 | </TR> |
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253 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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254 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.JobInfo.html" title="class in org.apache.hadoop.mapred">JobHistory.JobInfo</A></B></TD> |
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255 | <TD>Helper class for logging or reading back events related to job start, finish or failure.</TD> |
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256 | </TR> |
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257 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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258 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.MapAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.MapAttempt</A></B></TD> |
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259 | <TD>Helper class for logging or reading back events related to start, finish or failure of |
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260 | a Map Attempt on a node.</TD> |
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261 | </TR> |
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262 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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263 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.ReduceAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.ReduceAttempt</A></B></TD> |
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264 | <TD>Helper class for logging or reading back events related to start, finish or failure of |
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265 | a Map Attempt on a node.</TD> |
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266 | </TR> |
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267 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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268 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Task.html" title="class in org.apache.hadoop.mapred">JobHistory.Task</A></B></TD> |
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269 | <TD>Helper class for logging or reading back events related to Task's start, finish or failure.</TD> |
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270 | </TR> |
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271 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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272 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.TaskAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.TaskAttempt</A></B></TD> |
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273 | <TD>Base class for Map and Reduce TaskAttempts.</TD> |
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274 | </TR> |
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275 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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276 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobID.html" title="class in org.apache.hadoop.mapred">JobID</A></B></TD> |
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277 | <TD><B>Deprecated.</B></TD> |
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278 | </TR> |
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279 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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280 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobProfile.html" title="class in org.apache.hadoop.mapred">JobProfile</A></B></TD> |
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281 | <TD>A JobProfile is a MapReduce primitive.</TD> |
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282 | </TR> |
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283 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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284 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobQueueInfo.html" title="class in org.apache.hadoop.mapred">JobQueueInfo</A></B></TD> |
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285 | <TD>Class that contains the information regarding the Job Queues which are |
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286 | maintained by the Hadoop Map/Reduce framework.</TD> |
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287 | </TR> |
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288 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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289 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobStatus.html" title="class in org.apache.hadoop.mapred">JobStatus</A></B></TD> |
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290 | <TD>Describes the current status of a job.</TD> |
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291 | </TR> |
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292 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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293 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobTracker.html" title="class in org.apache.hadoop.mapred">JobTracker</A></B></TD> |
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294 | <TD>JobTracker is the central location for submitting and |
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295 | tracking MR jobs in a network environment.</TD> |
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296 | </TR> |
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297 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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298 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html" title="class in org.apache.hadoop.mapred">KeyValueLineRecordReader</A></B></TD> |
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299 | <TD>This class treats a line in the input as a key/value pair separated by a |
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300 | separator character.</TD> |
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301 | </TR> |
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302 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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303 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueTextInputFormat.html" title="class in org.apache.hadoop.mapred">KeyValueTextInputFormat</A></B></TD> |
---|
304 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A> for plain text files.</TD> |
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305 | </TR> |
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306 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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307 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/LineRecordReader.html" title="class in org.apache.hadoop.mapred">LineRecordReader</A></B></TD> |
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308 | <TD><B>Deprecated.</B> <I>Use |
---|
309 | <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/LineRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>LineRecordReader</CODE></A> instead.</I></TD> |
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310 | </TR> |
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311 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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312 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/LineRecordReader.LineReader.html" title="class in org.apache.hadoop.mapred">LineRecordReader.LineReader</A></B></TD> |
---|
313 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/util/LineReader.html" title="class in org.apache.hadoop.util"><CODE>LineReader</CODE></A> instead.</I></TD> |
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314 | </TR> |
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315 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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316 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapFileOutputFormat.html" title="class in org.apache.hadoop.mapred">MapFileOutputFormat</A></B></TD> |
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317 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>OutputFormat</CODE></A> that writes <A HREF="../../../../org/apache/hadoop/io/MapFile.html" title="class in org.apache.hadoop.io"><CODE>MapFile</CODE></A>s.</TD> |
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318 | </TR> |
---|
319 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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320 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">MapReduceBase</A></B></TD> |
---|
321 | <TD><B>Deprecated.</B></TD> |
---|
322 | </TR> |
---|
323 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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324 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapReducePolicyProvider.html" title="class in org.apache.hadoop.mapred">MapReducePolicyProvider</A></B></TD> |
---|
325 | <TD><A HREF="../../../../org/apache/hadoop/security/authorize/PolicyProvider.html" title="class in org.apache.hadoop.security.authorize"><CODE>PolicyProvider</CODE></A> for Map-Reduce protocols.</TD> |
---|
326 | </TR> |
---|
327 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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328 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapRunner.html" title="class in org.apache.hadoop.mapred">MapRunner<K1,V1,K2,V2></A></B></TD> |
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329 | <TD>Default <A HREF="../../../../org/apache/hadoop/mapred/MapRunnable.html" title="interface in org.apache.hadoop.mapred"><CODE>MapRunnable</CODE></A> implementation.</TD> |
---|
330 | </TR> |
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331 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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332 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MultiFileInputFormat.html" title="class in org.apache.hadoop.mapred">MultiFileInputFormat<K,V></A></B></TD> |
---|
333 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapred/lib/CombineFileInputFormat.html" title="class in org.apache.hadoop.mapred.lib"><CODE>CombineFileInputFormat</CODE></A> instead</I></TD> |
---|
334 | </TR> |
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335 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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336 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MultiFileSplit.html" title="class in org.apache.hadoop.mapred">MultiFileSplit</A></B></TD> |
---|
337 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapred/lib/CombineFileSplit.html" title="class in org.apache.hadoop.mapred.lib"><CODE>CombineFileSplit</CODE></A> instead</I></TD> |
---|
338 | </TR> |
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339 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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340 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/OutputCommitter.html" title="class in org.apache.hadoop.mapred">OutputCommitter</A></B></TD> |
---|
341 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html" title="class in org.apache.hadoop.mapreduce"><CODE>OutputCommitter</CODE></A> instead.</I></TD> |
---|
342 | </TR> |
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343 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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344 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/OutputLogFilter.html" title="class in org.apache.hadoop.mapred">OutputLogFilter</A></B></TD> |
---|
345 | <TD>This class filters log files from directory given |
---|
346 | It doesnt accept paths having _logs.</TD> |
---|
347 | </TR> |
---|
348 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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349 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat</A></B></TD> |
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350 | <TD>InputFormat reading keys, values from SequenceFiles in binary (raw) |
---|
351 | format.</TD> |
---|
352 | </TR> |
---|
353 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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354 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader</A></B></TD> |
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355 | <TD>Read records from a SequenceFile as binary (raw) bytes.</TD> |
---|
356 | </TR> |
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357 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
358 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryOutputFormat</A></B></TD> |
---|
359 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>OutputFormat</CODE></A> that writes keys, values to |
---|
360 | <A HREF="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile</CODE></A>s in binary(raw) format</TD> |
---|
361 | </TR> |
---|
362 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
363 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.WritableValueBytes.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryOutputFormat.WritableValueBytes</A></B></TD> |
---|
364 | <TD>Inner class used for appendRaw</TD> |
---|
365 | </TR> |
---|
366 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
367 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsTextInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextInputFormat</A></B></TD> |
---|
368 | <TD>This class is similar to SequenceFileInputFormat, except it generates SequenceFileAsTextRecordReader |
---|
369 | which converts the input keys and values to their String forms by calling toString() method.</TD> |
---|
370 | </TR> |
---|
371 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
372 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsTextRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextRecordReader</A></B></TD> |
---|
373 | <TD>This class converts the input keys and values to their String forms by calling toString() |
---|
374 | method.</TD> |
---|
375 | </TR> |
---|
376 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
377 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter<K,V></A></B></TD> |
---|
378 | <TD>A class that allows a map/red job to work on a sample of sequence files.</TD> |
---|
379 | </TR> |
---|
380 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
381 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.FilterBase.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter.FilterBase</A></B></TD> |
---|
382 | <TD>base class for Filters</TD> |
---|
383 | </TR> |
---|
384 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
385 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.MD5Filter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter.MD5Filter</A></B></TD> |
---|
386 | <TD>This class returns a set of records by examing the MD5 digest of its |
---|
387 | key against a filtering frequency <i>f</i>.</TD> |
---|
388 | </TR> |
---|
389 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
390 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.PercentFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter.PercentFilter</A></B></TD> |
---|
391 | <TD>This class returns a percentage of records |
---|
392 | The percentage is determined by a filtering frequency <i>f</i> using |
---|
393 | the criteria record# % f == 0.</TD> |
---|
394 | </TR> |
---|
395 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
396 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.RegexFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter.RegexFilter</A></B></TD> |
---|
397 | <TD>Records filter by matching key to regex</TD> |
---|
398 | </TR> |
---|
399 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
400 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFormat<K,V></A></B></TD> |
---|
401 | <TD><B>Deprecated.</B> <I>Use |
---|
402 | <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/SequenceFileInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>SequenceFileInputFormat</CODE></A> |
---|
403 | instead.</I></TD> |
---|
404 | </TR> |
---|
405 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
406 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileOutputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileOutputFormat<K,V></A></B></TD> |
---|
407 | <TD><B>Deprecated.</B> <I>Use |
---|
408 | <A HREF="../../../../org/apache/hadoop/mapreduce/lib/output/SequenceFileOutputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.output"><CODE>SequenceFileOutputFormat</CODE></A> |
---|
409 | instead.</I></TD> |
---|
410 | </TR> |
---|
411 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
412 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileRecordReader<K,V></A></B></TD> |
---|
413 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> for <A HREF="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile</CODE></A>s.</TD> |
---|
414 | </TR> |
---|
415 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
416 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html" title="class in org.apache.hadoop.mapred">SkipBadRecords</A></B></TD> |
---|
417 | <TD>Utility class for skip bad records functionality.</TD> |
---|
418 | </TR> |
---|
419 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
420 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptContext.html" title="class in org.apache.hadoop.mapred">TaskAttemptContext</A></B></TD> |
---|
421 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce"><CODE>TaskAttemptContext</CODE></A> |
---|
422 | instead.</I></TD> |
---|
423 | </TR> |
---|
424 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
425 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A></B></TD> |
---|
426 | <TD><B>Deprecated.</B></TD> |
---|
427 | </TR> |
---|
428 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
429 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskCompletionEvent.html" title="class in org.apache.hadoop.mapred">TaskCompletionEvent</A></B></TD> |
---|
430 | <TD>This is used to track task completion events on |
---|
431 | job tracker.</TD> |
---|
432 | </TR> |
---|
433 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
434 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskGraphServlet.html" title="class in org.apache.hadoop.mapred">TaskGraphServlet</A></B></TD> |
---|
435 | <TD>The servlet that outputs svg graphics for map / reduce task |
---|
436 | statuses</TD> |
---|
437 | </TR> |
---|
438 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
439 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskID.html" title="class in org.apache.hadoop.mapred">TaskID</A></B></TD> |
---|
440 | <TD><B>Deprecated.</B></TD> |
---|
441 | </TR> |
---|
442 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
443 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskLog.html" title="class in org.apache.hadoop.mapred">TaskLog</A></B></TD> |
---|
444 | <TD>A simple logger to handle the task-specific user logs.</TD> |
---|
445 | </TR> |
---|
446 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
447 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskLogAppender.html" title="class in org.apache.hadoop.mapred">TaskLogAppender</A></B></TD> |
---|
448 | <TD>A simple log4j-appender for the task child's |
---|
449 | map-reduce system logs.</TD> |
---|
450 | </TR> |
---|
451 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
452 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskLogServlet.html" title="class in org.apache.hadoop.mapred">TaskLogServlet</A></B></TD> |
---|
453 | <TD>A servlet that is run by the TaskTrackers to provide the task logs via http.</TD> |
---|
454 | </TR> |
---|
455 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
456 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskReport.html" title="class in org.apache.hadoop.mapred">TaskReport</A></B></TD> |
---|
457 | <TD>A report on the state of a task.</TD> |
---|
458 | </TR> |
---|
459 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
460 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html" title="class in org.apache.hadoop.mapred">TaskTracker</A></B></TD> |
---|
461 | <TD>TaskTracker is a process that starts and tracks MR Tasks |
---|
462 | in a networked environment.</TD> |
---|
463 | </TR> |
---|
464 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
465 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.MapOutputServlet.html" title="class in org.apache.hadoop.mapred">TaskTracker.MapOutputServlet</A></B></TD> |
---|
466 | <TD>This class is used in TaskTracker's Jetty to serve the map outputs |
---|
467 | to other nodes.</TD> |
---|
468 | </TR> |
---|
469 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
470 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TextInputFormat.html" title="class in org.apache.hadoop.mapred">TextInputFormat</A></B></TD> |
---|
471 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/TextInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>TextInputFormat</CODE></A> |
---|
472 | instead.</I></TD> |
---|
473 | </TR> |
---|
474 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
475 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TextOutputFormat.html" title="class in org.apache.hadoop.mapred">TextOutputFormat<K,V></A></B></TD> |
---|
476 | <TD><B>Deprecated.</B> <I>Use |
---|
477 | <A HREF="../../../../org/apache/hadoop/mapreduce/lib/output/TextOutputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.output"><CODE>TextOutputFormat</CODE></A> instead.</I></TD> |
---|
478 | </TR> |
---|
479 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
480 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TextOutputFormat.LineRecordWriter.html" title="class in org.apache.hadoop.mapred">TextOutputFormat.LineRecordWriter<K,V></A></B></TD> |
---|
481 | <TD> </TD> |
---|
482 | </TR> |
---|
483 | </TABLE> |
---|
484 | |
---|
485 | |
---|
486 | <P> |
---|
487 | |
---|
488 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
---|
489 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
---|
490 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
---|
491 | <B>Enum Summary</B></FONT></TH> |
---|
492 | </TR> |
---|
493 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
494 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobClient.TaskStatusFilter.html" title="enum in org.apache.hadoop.mapred">JobClient.TaskStatusFilter</A></B></TD> |
---|
495 | <TD> </TD> |
---|
496 | </TR> |
---|
497 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
498 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Keys.html" title="enum in org.apache.hadoop.mapred">JobHistory.Keys</A></B></TD> |
---|
499 | <TD>Job history files contain key="value" pairs, where keys belong to this enum.</TD> |
---|
500 | </TR> |
---|
501 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
502 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.RecordTypes.html" title="enum in org.apache.hadoop.mapred">JobHistory.RecordTypes</A></B></TD> |
---|
503 | <TD>Record types are identifiers for each line of log in history files.</TD> |
---|
504 | </TR> |
---|
505 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
506 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Values.html" title="enum in org.apache.hadoop.mapred">JobHistory.Values</A></B></TD> |
---|
507 | <TD>This enum contains some of the values commonly used by history log events.</TD> |
---|
508 | </TR> |
---|
509 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
510 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobPriority.html" title="enum in org.apache.hadoop.mapred">JobPriority</A></B></TD> |
---|
511 | <TD>Used to describe the priority of the running job.</TD> |
---|
512 | </TR> |
---|
513 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
514 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobTracker.State.html" title="enum in org.apache.hadoop.mapred">JobTracker.State</A></B></TD> |
---|
515 | <TD> </TD> |
---|
516 | </TR> |
---|
517 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
518 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskCompletionEvent.Status.html" title="enum in org.apache.hadoop.mapred">TaskCompletionEvent.Status</A></B></TD> |
---|
519 | <TD> </TD> |
---|
520 | </TR> |
---|
521 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
522 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskLog.LogName.html" title="enum in org.apache.hadoop.mapred">TaskLog.LogName</A></B></TD> |
---|
523 | <TD>The filter for userlogs.</TD> |
---|
524 | </TR> |
---|
525 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
526 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TIPStatus.html" title="enum in org.apache.hadoop.mapred">TIPStatus</A></B></TD> |
---|
527 | <TD>The states of a <CODE>TaskInProgress</CODE> as seen by the JobTracker.</TD> |
---|
528 | </TR> |
---|
529 | </TABLE> |
---|
530 | |
---|
531 | |
---|
532 | <P> |
---|
533 | |
---|
534 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
---|
535 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
---|
536 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
---|
537 | <B>Exception Summary</B></FONT></TH> |
---|
538 | </TR> |
---|
539 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
540 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileAlreadyExistsException.html" title="class in org.apache.hadoop.mapred">FileAlreadyExistsException</A></B></TD> |
---|
541 | <TD>Used when target file already exists for any operation and |
---|
542 | is not configured to be overwritten.</TD> |
---|
543 | </TR> |
---|
544 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
545 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InvalidFileTypeException.html" title="class in org.apache.hadoop.mapred">InvalidFileTypeException</A></B></TD> |
---|
546 | <TD>Used when file type differs from the desired file type.</TD> |
---|
547 | </TR> |
---|
548 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
549 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InvalidInputException.html" title="class in org.apache.hadoop.mapred">InvalidInputException</A></B></TD> |
---|
550 | <TD>This class wraps a list of problems with the input, so that the user |
---|
551 | can get a list of problems together instead of finding and fixing them one |
---|
552 | by one.</TD> |
---|
553 | </TR> |
---|
554 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
555 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InvalidJobConfException.html" title="class in org.apache.hadoop.mapred">InvalidJobConfException</A></B></TD> |
---|
556 | <TD>This exception is thrown when jobconf misses some mendatory attributes |
---|
557 | or value of some attributes is invalid.</TD> |
---|
558 | </TR> |
---|
559 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
560 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobTracker.IllegalStateException.html" title="class in org.apache.hadoop.mapred">JobTracker.IllegalStateException</A></B></TD> |
---|
561 | <TD>A client tried to submit a job before the Job Tracker was ready.</TD> |
---|
562 | </TR> |
---|
563 | </TABLE> |
---|
564 | |
---|
565 | |
---|
566 | <P> |
---|
567 | <A NAME="package_description"><!-- --></A><H2> |
---|
568 | Package org.apache.hadoop.mapred Description |
---|
569 | </H2> |
---|
570 | |
---|
571 | <P> |
---|
572 | <p>A software framework for easily writing applications which process vast |
---|
573 | amounts of data (multi-terabyte data-sets) parallelly on large clusters |
---|
574 | (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant |
---|
575 | manner.</p> |
---|
576 | |
---|
577 | <p>A Map-Reduce <i>job</i> usually splits the input data-set into independent |
---|
578 | chunks which processed by <i>map</i> tasks in completely parallel manner, |
---|
579 | followed by <i>reduce</i> tasks which aggregating their output. Typically both |
---|
580 | the input and the output of the job are stored in a |
---|
581 | <A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs"><CODE>FileSystem</CODE></A>. The framework takes care of monitoring |
---|
582 | tasks and re-executing failed ones. Since, usually, the compute nodes and the |
---|
583 | storage nodes are the same i.e. Hadoop's Map-Reduce framework and Distributed |
---|
584 | FileSystem are running on the same set of nodes, tasks are effectively scheduled |
---|
585 | on the nodes where data is already present, resulting in very high aggregate |
---|
586 | bandwidth across the cluster.</p> |
---|
587 | |
---|
588 | <p>The Map-Reduce framework operates exclusively on <tt><key, value></tt> |
---|
589 | pairs i.e. the input to the job is viewed as a set of <tt><key, value></tt> |
---|
590 | pairs and the output as another, possibly different, set of |
---|
591 | <tt><key, value></tt> pairs. The <tt>key</tt>s and <tt>value</tt>s have to |
---|
592 | be serializable as <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io"><CODE>Writable</CODE></A>s and additionally the |
---|
593 | <tt>key</tt>s have to be <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A>s in |
---|
594 | order to facilitate grouping by the framework.</p> |
---|
595 | |
---|
596 | <p>Data flow:</p> |
---|
597 | <pre> |
---|
598 | (input) |
---|
599 | <tt><k1, v1></tt> |
---|
600 | |
---|
601 | | |
---|
602 | V |
---|
603 | |
---|
604 | <b>map</b> |
---|
605 | |
---|
606 | | |
---|
607 | V |
---|
608 | |
---|
609 | <tt><k2, v2></tt> |
---|
610 | |
---|
611 | | |
---|
612 | V |
---|
613 | |
---|
614 | <b>combine</b> |
---|
615 | |
---|
616 | | |
---|
617 | V |
---|
618 | |
---|
619 | <tt><k2, v2></tt> |
---|
620 | |
---|
621 | | |
---|
622 | V |
---|
623 | |
---|
624 | <b>reduce</b> |
---|
625 | |
---|
626 | | |
---|
627 | V |
---|
628 | |
---|
629 | <tt><k3, v3></tt> |
---|
630 | (output) |
---|
631 | </pre> |
---|
632 | |
---|
633 | <p>Applications typically implement |
---|
634 | <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html#map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><CODE>Mapper.map(Object, Object, OutputCollector, Reporter)</CODE></A> |
---|
635 | and |
---|
636 | <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html#reduce(K2, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><CODE>Reducer.reduce(Object, Iterator, OutputCollector, Reporter)</CODE></A> |
---|
637 | methods. The application-writer also specifies various facets of the job such |
---|
638 | as input and output locations, the <tt>Partitioner</tt>, <tt>InputFormat</tt> |
---|
639 | & <tt>OutputFormat</tt> implementations to be used etc. as |
---|
640 | a <A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><CODE>JobConf</CODE></A>. The client program, |
---|
641 | <A HREF="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred"><CODE>JobClient</CODE></A>, then submits the job to the framework |
---|
642 | and optionally monitors it.</p> |
---|
643 | |
---|
644 | <p>The framework spawns one map task per |
---|
645 | <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> generated by the |
---|
646 | <A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A> of the job and calls |
---|
647 | <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html#map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><CODE>Mapper.map(Object, Object, OutputCollector, Reporter)</CODE></A> |
---|
648 | with each <key, value> pair read by the |
---|
649 | <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> from the <tt>InputSplit</tt> for |
---|
650 | the task. The intermediate outputs of the maps are then grouped by <tt>key</tt>s |
---|
651 | and optionally aggregated by <i>combiner</i>. The key space of intermediate |
---|
652 | outputs are paritioned by the <A HREF="../../../../org/apache/hadoop/mapred/Partitioner.html" title="interface in org.apache.hadoop.mapred"><CODE>Partitioner</CODE></A>, where |
---|
653 | the number of partitions is exactly the number of reduce tasks for the job.</p> |
---|
654 | |
---|
655 | <p>The reduce tasks fetch the sorted intermediate outputs of the maps, via http, |
---|
656 | merge the <key, value> pairs and call |
---|
657 | <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html#reduce(K2, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><CODE>Reducer.reduce(Object, Iterator, OutputCollector, Reporter)</CODE></A> |
---|
658 | for each <key, list of values> pair. The output of the reduce tasks' is |
---|
659 | stored on the <tt>FileSystem</tt> by the |
---|
660 | <A HREF="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordWriter</CODE></A> provided by the |
---|
661 | <A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>OutputFormat</CODE></A> of the job.</p> |
---|
662 | |
---|
663 | <p>Map-Reduce application to perform a distributed <i>grep</i>:</p> |
---|
664 | <pre><tt> |
---|
665 | public class Grep extends Configured implements Tool { |
---|
666 | |
---|
667 | // <i>map: Search for the pattern specified by 'grep.mapper.regex' &</i> |
---|
668 | // <i>'grep.mapper.regex.group'</i> |
---|
669 | |
---|
670 | class GrepMapper<K, Text> |
---|
671 | extends MapReduceBase implements Mapper<K, Text, Text, LongWritable> { |
---|
672 | |
---|
673 | private Pattern pattern; |
---|
674 | private int group; |
---|
675 | |
---|
676 | public void configure(JobConf job) { |
---|
677 | pattern = Pattern.compile(job.get("grep.mapper.regex")); |
---|
678 | group = job.getInt("grep.mapper.regex.group", 0); |
---|
679 | } |
---|
680 | |
---|
681 | public void map(K key, Text value, |
---|
682 | OutputCollector<Text, LongWritable> output, |
---|
683 | Reporter reporter) |
---|
684 | throws IOException { |
---|
685 | String text = value.toString(); |
---|
686 | Matcher matcher = pattern.matcher(text); |
---|
687 | while (matcher.find()) { |
---|
688 | output.collect(new Text(matcher.group(group)), new LongWritable(1)); |
---|
689 | } |
---|
690 | } |
---|
691 | } |
---|
692 | |
---|
693 | // <i>reduce: Count the number of occurrences of the pattern</i> |
---|
694 | |
---|
695 | class GrepReducer<K> extends MapReduceBase |
---|
696 | implements Reducer<K, LongWritable, K, LongWritable> { |
---|
697 | |
---|
698 | public void reduce(K key, Iterator<LongWritable> values, |
---|
699 | OutputCollector<K, LongWritable> output, |
---|
700 | Reporter reporter) |
---|
701 | throws IOException { |
---|
702 | |
---|
703 | // sum all values for this key |
---|
704 | long sum = 0; |
---|
705 | while (values.hasNext()) { |
---|
706 | sum += values.next().get(); |
---|
707 | } |
---|
708 | |
---|
709 | // output sum |
---|
710 | output.collect(key, new LongWritable(sum)); |
---|
711 | } |
---|
712 | } |
---|
713 | |
---|
714 | public int run(String[] args) throws Exception { |
---|
715 | if (args.length < 3) { |
---|
716 | System.out.println("Grep <inDir> <outDir> <regex> [<group>]"); |
---|
717 | ToolRunner.printGenericCommandUsage(System.out); |
---|
718 | return -1; |
---|
719 | } |
---|
720 | |
---|
721 | JobConf grepJob = new JobConf(getConf(), Grep.class); |
---|
722 | |
---|
723 | grepJob.setJobName("grep"); |
---|
724 | |
---|
725 | FileInputFormat.setInputPaths(grepJob, new Path(args[0])); |
---|
726 | FileOutputFormat.setOutputPath(grepJob, args[1]); |
---|
727 | |
---|
728 | grepJob.setMapperClass(GrepMapper.class); |
---|
729 | grepJob.setCombinerClass(GrepReducer.class); |
---|
730 | grepJob.setReducerClass(GrepReducer.class); |
---|
731 | |
---|
732 | grepJob.set("mapred.mapper.regex", args[2]); |
---|
733 | if (args.length == 4) |
---|
734 | grepJob.set("mapred.mapper.regex.group", args[3]); |
---|
735 | |
---|
736 | grepJob.setOutputFormat(SequenceFileOutputFormat.class); |
---|
737 | grepJob.setOutputKeyClass(Text.class); |
---|
738 | grepJob.setOutputValueClass(LongWritable.class); |
---|
739 | |
---|
740 | JobClient.runJob(grepJob); |
---|
741 | |
---|
742 | return 0; |
---|
743 | } |
---|
744 | |
---|
745 | public static void main(String[] args) throws Exception { |
---|
746 | int res = ToolRunner.run(new Configuration(), new Grep(), args); |
---|
747 | System.exit(res); |
---|
748 | } |
---|
749 | |
---|
750 | } |
---|
751 | </tt></pre> |
---|
752 | |
---|
753 | <p>Notice how the data-flow of the above grep job is very similar to doing the |
---|
754 | same via the unix pipeline:</p> |
---|
755 | |
---|
756 | <pre> |
---|
757 | cat input/* | grep | sort | uniq -c > out |
---|
758 | </pre> |
---|
759 | |
---|
760 | <pre> |
---|
761 | input | map | shuffle | reduce > out |
---|
762 | </pre> |
---|
763 | |
---|
764 | <p>Hadoop Map-Reduce applications need not be written in |
---|
765 | Java<small><sup>TM</sup></small> only. |
---|
766 | <a href="../streaming/package-summary.html">Hadoop Streaming</a> is a utility |
---|
767 | which allows users to create and run jobs with any executables (e.g. shell |
---|
768 | utilities) as the mapper and/or the reducer. |
---|
769 | <a href="pipes/package-summary.html">Hadoop Pipes</a> is a |
---|
770 | <a href="http://www.swig.org/">SWIG</a>-compatible <em>C++ API</em> to implement |
---|
771 | Map-Reduce applications (non JNI<small><sup>TM</sup></small> based).</p> |
---|
772 | |
---|
773 | <p>See <a href="http://labs.google.com/papers/mapreduce.html">Google's original |
---|
774 | Map/Reduce paper</a> for background information.</p> |
---|
775 | |
---|
776 | <p><i>Java and JNI are trademarks or registered trademarks of |
---|
777 | Sun Microsystems, Inc. in the United States and other countries.</i></p> |
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778 | <P> |
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779 | |
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780 | <P> |
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