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7org.apache.hadoop.io.serializer (Hadoop 0.20.1 API)
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82<H2>
83Package org.apache.hadoop.io.serializer
84</H2>
85
86This package provides a mechanism for using different serialization frameworks
87in Hadoop.
88<P>
89<B>See:</B>
90<BR>
91&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A HREF="#package_description"><B>Description</B></A>
92<P>
93
94<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
95<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
96<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
97<B>Interface Summary</B></FONT></TH>
98</TR>
99<TR BGCOLOR="white" CLASS="TableRowColor">
100<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/serializer/Deserializer.html" title="interface in org.apache.hadoop.io.serializer">Deserializer&lt;T&gt;</A></B></TD>
101<TD>
102 Provides a facility for deserializing objects of type <T> from an
103 <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io"><CODE>InputStream</CODE></A>.</TD>
104</TR>
105<TR BGCOLOR="white" CLASS="TableRowColor">
106<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/serializer/Serialization.html" title="interface in org.apache.hadoop.io.serializer">Serialization&lt;T&gt;</A></B></TD>
107<TD>
108 Encapsulates a <A HREF="../../../../../org/apache/hadoop/io/serializer/Serializer.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Serializer</CODE></A>/<A HREF="../../../../../org/apache/hadoop/io/serializer/Deserializer.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Deserializer</CODE></A> pair.</TD>
109</TR>
110<TR BGCOLOR="white" CLASS="TableRowColor">
111<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/serializer/Serializer.html" title="interface in org.apache.hadoop.io.serializer">Serializer&lt;T&gt;</A></B></TD>
112<TD>
113 Provides a facility for serializing objects of type <T> to an
114 <A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><CODE>OutputStream</CODE></A>.</TD>
115</TR>
116</TABLE>
117&nbsp;
118
119<P>
120
121<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
122<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
123<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
124<B>Class Summary</B></FONT></TH>
125</TR>
126<TR BGCOLOR="white" CLASS="TableRowColor">
127<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/serializer/DeserializerComparator.html" title="class in org.apache.hadoop.io.serializer">DeserializerComparator&lt;T&gt;</A></B></TD>
128<TD>
129 A <A HREF="../../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io"><CODE>RawComparator</CODE></A> that uses a <A HREF="../../../../../org/apache/hadoop/io/serializer/Deserializer.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Deserializer</CODE></A> to deserialize
130 the objects to be compared so that the standard <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util"><CODE>Comparator</CODE></A> can
131 be used to compare them.</TD>
132</TR>
133<TR BGCOLOR="white" CLASS="TableRowColor">
134<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/serializer/JavaSerialization.html" title="class in org.apache.hadoop.io.serializer">JavaSerialization</A></B></TD>
135<TD>
136 An experimental <A HREF="../../../../../org/apache/hadoop/io/serializer/Serialization.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Serialization</CODE></A> for Java <A HREF="http://java.sun.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io"><CODE>Serializable</CODE></A> classes.</TD>
137</TR>
138<TR BGCOLOR="white" CLASS="TableRowColor">
139<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/serializer/JavaSerializationComparator.html" title="class in org.apache.hadoop.io.serializer">JavaSerializationComparator&lt;T extends Serializable & Comparable&lt;T&gt;&gt;</A></B></TD>
140<TD>
141 A <A HREF="../../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io"><CODE>RawComparator</CODE></A> that uses a <A HREF="../../../../../org/apache/hadoop/io/serializer/JavaSerialization.html" title="class in org.apache.hadoop.io.serializer"><CODE>JavaSerialization</CODE></A>
142 <A HREF="../../../../../org/apache/hadoop/io/serializer/Deserializer.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Deserializer</CODE></A> to deserialize objects that are then compared via
143 their <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang"><CODE>Comparable</CODE></A> interfaces.</TD>
144</TR>
145<TR BGCOLOR="white" CLASS="TableRowColor">
146<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/serializer/SerializationFactory.html" title="class in org.apache.hadoop.io.serializer">SerializationFactory</A></B></TD>
147<TD>
148 A factory for <A HREF="../../../../../org/apache/hadoop/io/serializer/Serialization.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Serialization</CODE></A>s.</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/serializer/WritableSerialization.html" title="class in org.apache.hadoop.io.serializer">WritableSerialization</A></B></TD>
152<TD>A <A HREF="../../../../../org/apache/hadoop/io/serializer/Serialization.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Serialization</CODE></A> for <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io"><CODE>Writable</CODE></A>s that delegates to
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155</TR>
156</TABLE>
157&nbsp;
158
159<P>
160<A NAME="package_description"><!-- --></A><H2>
161Package org.apache.hadoop.io.serializer Description
162</H2>
163
164<P>
165<p>
166This package provides a mechanism for using different serialization frameworks
167in Hadoop. The property "io.serializations" defines a list of
168<A HREF="../../../../../org/apache/hadoop/io/serializer/Serialization.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Serialization</CODE></A>s that know how to create
169<A HREF="../../../../../org/apache/hadoop/io/serializer/Serializer.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Serializer</CODE></A>s and
170<A HREF="../../../../../org/apache/hadoop/io/serializer/Deserializer.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Deserializer</CODE></A>s.
171</p>
172
173<p>
174To add a new serialization framework write an implementation of
175<A HREF="../../../../../org/apache/hadoop/io/serializer/Serialization.html" title="interface in org.apache.hadoop.io.serializer"><CODE>Serialization</CODE></A> and add its name to the
176"io.serializations" property.
177</p>
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179
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