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<h1 title="Package" class="title">Package&nbsp;org.apache.hadoop.io</h1>
<div class="docSummary">
<div class="block">Generic i/o code for use when reading and writing data to the network,
to databases, and to files.</div>
</div>
<p>See:&nbsp;<a href="#package.description">Description</a></p>
</div>
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<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
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<tbody>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ByteBufferPool.html" title="interface in org.apache.hadoop.io">ByteBufferPool</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/Closeable.html" title="interface in org.apache.hadoop.io">Closeable</a></td>
<td class="colLast">Deprecated
<div class="block"><span class="deprecationComment">use java.io.Closeable</span></div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MapFile.Reader.Option.html" title="interface in org.apache.hadoop.io">MapFile.Reader.Option</a></td>
<td class="colLast">&nbsp;</td>
</tr>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MapFile.Writer.Option.html" title="interface in org.apache.hadoop.io">MapFile.Writer.Option</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</a>&lt;T&gt;</td>
<td class="colLast">
<div class="block">
A <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util"><code>Comparator</code></a> that operates directly on byte representations of
objects.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ReadaheadPool.ReadaheadRequest.html" title="interface in org.apache.hadoop.io">ReadaheadPool.ReadaheadRequest</a></td>
<td class="colLast">
<div class="block">An outstanding readahead request that has been submitted to
the pool.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/SequenceFile.Reader.Option.html" title="interface in org.apache.hadoop.io">SequenceFile.Reader.Option</a></td>
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<div class="block">A tag interface for all of the Reader options</div>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/SequenceFile.Sorter.RawKeyValueIterator.html" title="interface in org.apache.hadoop.io">SequenceFile.Sorter.RawKeyValueIterator</a></td>
<td class="colLast">
<div class="block">The interface to iterate over raw keys/values of SequenceFiles.</div>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/SequenceFile.ValueBytes.html" title="interface in org.apache.hadoop.io">SequenceFile.ValueBytes</a></td>
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<div class="block">The interface to 'raw' values of SequenceFiles.</div>
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<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/SequenceFile.Writer.Option.html" title="interface in org.apache.hadoop.io">SequenceFile.Writer.Option</a></td>
<td class="colLast">&nbsp;</td>
</tr>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/Stringifier.html" title="interface in org.apache.hadoop.io">Stringifier</a>&lt;T&gt;</td>
<td class="colLast">
<div class="block">Stringifier interface offers two methods to convert an object
to a string representation and restore the object given its
string representation.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></td>
<td class="colLast">
<div class="block">A serializable object which implements a simple, efficient, serialization
protocol, based on <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> and <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a>.</div>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>&lt;T&gt;</td>
<td class="colLast">
<div class="block">A <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io"><code>Writable</code></a> which is also <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang"><code>Comparable</code></a>.</div>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/WritableFactory.html" title="interface in org.apache.hadoop.io">WritableFactory</a></td>
<td class="colLast">
<div class="block">A factory for a class of Writable.</div>
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<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/AbstractMapWritable.html" title="class in org.apache.hadoop.io">AbstractMapWritable</a></td>
<td class="colLast">
<div class="block">Abstract base class for MapWritable and SortedMapWritable
Unlike org.apache.nutch.crawl.MapWritable, this class allows creation of
MapWritable&lt;Writable, MapWritable&gt; so the CLASS_TO_ID and ID_TO_CLASS
maps travel with the class instead of being static.</div>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ArrayFile.html" title="class in org.apache.hadoop.io">ArrayFile</a></td>
<td class="colLast">
<div class="block">A dense file-based mapping from integers to values.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ArrayFile.Reader.html" title="class in org.apache.hadoop.io">ArrayFile.Reader</a></td>
<td class="colLast">
<div class="block">Provide access to an existing array file.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ArrayFile.Writer.html" title="class in org.apache.hadoop.io">ArrayFile.Writer</a></td>
<td class="colLast">
<div class="block">Write a new array file.</div>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ArrayPrimitiveWritable.html" title="class in org.apache.hadoop.io">ArrayPrimitiveWritable</a></td>
<td class="colLast">
<div class="block">This is a wrapper class.</div>
</td>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ArrayWritable.html" title="class in org.apache.hadoop.io">ArrayWritable</a></td>
<td class="colLast">
<div class="block">A Writable for arrays containing instances of a class.</div>
</td>
</tr>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</a></td>
<td class="colLast">
<div class="block">Interface supported by <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a>
types supporting ordering/permutation by a representative set of bytes.</div>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/BloomMapFile.html" title="class in org.apache.hadoop.io">BloomMapFile</a></td>
<td class="colLast">
<div class="block">This class extends <a href="../../../../org/apache/hadoop/io/MapFile.html" title="class in org.apache.hadoop.io"><code>MapFile</code></a> and provides very much the same
functionality.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/BloomMapFile.Reader.html" title="class in org.apache.hadoop.io">BloomMapFile.Reader</a></td>
<td class="colLast">&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/BloomMapFile.Writer.html" title="class in org.apache.hadoop.io">BloomMapFile.Writer</a></td>
<td class="colLast">&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/BooleanWritable.html" title="class in org.apache.hadoop.io">BooleanWritable</a></td>
<td class="colLast">
<div class="block">A WritableComparable for booleans.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/BooleanWritable.Comparator.html" title="class in org.apache.hadoop.io">BooleanWritable.Comparator</a></td>
<td class="colLast">
<div class="block">A Comparator optimized for BooleanWritable.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/BytesWritable.html" title="class in org.apache.hadoop.io">BytesWritable</a></td>
<td class="colLast">
<div class="block">A byte sequence that is usable as a key or value.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/BytesWritable.Comparator.html" title="class in org.apache.hadoop.io">BytesWritable.Comparator</a></td>
<td class="colLast">
<div class="block">A Comparator optimized for BytesWritable.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ByteWritable.html" title="class in org.apache.hadoop.io">ByteWritable</a></td>
<td class="colLast">
<div class="block">A WritableComparable for a single byte.</div>
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</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ByteWritable.Comparator.html" title="class in org.apache.hadoop.io">ByteWritable.Comparator</a></td>
<td class="colLast">
<div class="block">A Comparator optimized for ByteWritable.</div>
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</tr>
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<td class="colFirst"><a href="../../../../org/apache/hadoop/io/CompressedWritable.html" title="class in org.apache.hadoop.io">CompressedWritable</a></td>
<td class="colLast">
<div class="block">A base-class for Writables which store themselves compressed and lazily
inflate on field access.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/DataInputByteBuffer.html" title="class in org.apache.hadoop.io">DataInputByteBuffer</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/DataOutputOutputStream.html" title="class in org.apache.hadoop.io">DataOutputOutputStream</a></td>
<td class="colLast">
<div class="block">OutputStream implementation that wraps a DataOutput.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/DefaultStringifier.html" title="class in org.apache.hadoop.io">DefaultStringifier</a>&lt;T&gt;</td>
<td class="colLast">
<div class="block">DefaultStringifier is the default implementation of the <a href="../../../../org/apache/hadoop/io/Stringifier.html" title="interface in org.apache.hadoop.io"><code>Stringifier</code></a>
interface which stringifies the objects using base64 encoding of the
serialized version of the objects.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/DoubleWritable.html" title="class in org.apache.hadoop.io">DoubleWritable</a></td>
<td class="colLast">
<div class="block">Writable for Double values.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/DoubleWritable.Comparator.html" title="class in org.apache.hadoop.io">DoubleWritable.Comparator</a></td>
<td class="colLast">
<div class="block">A Comparator optimized for DoubleWritable.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ElasticByteBufferPool.html" title="class in org.apache.hadoop.io">ElasticByteBufferPool</a></td>
<td class="colLast">
<div class="block">This is a simple ByteBufferPool which just creates ByteBuffers as needed.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/EnumSetWritable.html" title="class in org.apache.hadoop.io">EnumSetWritable</a>&lt;E extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a>&lt;E&gt;&gt;</td>
<td class="colLast">
<div class="block">A Writable wrapper for EnumSet.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/FloatWritable.html" title="class in org.apache.hadoop.io">FloatWritable</a></td>
<td class="colLast">
<div class="block">A WritableComparable for floats.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/FloatWritable.Comparator.html" title="class in org.apache.hadoop.io">FloatWritable.Comparator</a></td>
<td class="colLast">
<div class="block">A Comparator optimized for FloatWritable.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/GenericWritable.html" title="class in org.apache.hadoop.io">GenericWritable</a></td>
<td class="colLast">
<div class="block">A wrapper for Writable instances.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</a></td>
<td class="colLast">
<div class="block">A WritableComparable for ints.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/IntWritable.Comparator.html" title="class in org.apache.hadoop.io">IntWritable.Comparator</a></td>
<td class="colLast">
<div class="block">A Comparator optimized for IntWritable.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/IOUtils.html" title="class in org.apache.hadoop.io">IOUtils</a></td>
<td class="colLast">
<div class="block">An utility class for I/O related functionality.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/IOUtils.NullOutputStream.html" title="class in org.apache.hadoop.io">IOUtils.NullOutputStream</a></td>
<td class="colLast">
<div class="block">The /dev/null of OutputStreams.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a></td>
<td class="colLast">
<div class="block">A WritableComparable for longs.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/LongWritable.Comparator.html" title="class in org.apache.hadoop.io">LongWritable.Comparator</a></td>
<td class="colLast">
<div class="block">A Comparator optimized for LongWritable.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/LongWritable.DecreasingComparator.html" title="class in org.apache.hadoop.io">LongWritable.DecreasingComparator</a></td>
<td class="colLast">
<div class="block">A decreasing Comparator optimized for LongWritable.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MapFile.html" title="class in org.apache.hadoop.io">MapFile</a></td>
<td class="colLast">
<div class="block">A file-based map from keys to values.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MapFile.Merger.html" title="class in org.apache.hadoop.io">MapFile.Merger</a></td>
<td class="colLast">
<div class="block">Class to merge multiple MapFiles of same Key and Value types to one MapFile</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MapFile.Reader.html" title="class in org.apache.hadoop.io">MapFile.Reader</a></td>
<td class="colLast">
<div class="block">Provide access to an existing map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MapFile.Writer.html" title="class in org.apache.hadoop.io">MapFile.Writer</a></td>
<td class="colLast">
<div class="block">Writes a new map.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MapWritable.html" title="class in org.apache.hadoop.io">MapWritable</a></td>
<td class="colLast">
<div class="block">A Writable Map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MD5Hash.html" title="class in org.apache.hadoop.io">MD5Hash</a></td>
<td class="colLast">
<div class="block">A Writable for MD5 hash values.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MD5Hash.Comparator.html" title="class in org.apache.hadoop.io">MD5Hash.Comparator</a></td>
<td class="colLast">
<div class="block">A WritableComparator optimized for MD5Hash keys.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/MultipleIOException.Builder.html" title="class in org.apache.hadoop.io">MultipleIOException.Builder</a></td>
<td class="colLast">
<div class="block">Build an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io"><code>IOException</code></a> using <a href="../../../../org/apache/hadoop/io/MultipleIOException.html" title="class in org.apache.hadoop.io"><code>MultipleIOException</code></a>
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</td>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</a></td>
<td class="colLast">
<div class="block">Singleton Writable with no data.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/NullWritable.Comparator.html" title="class in org.apache.hadoop.io">NullWritable.Comparator</a></td>
<td class="colLast">
<div class="block">A Comparator &quot;optimized&quot; for NullWritable.</div>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/ObjectWritable.html" title="class in org.apache.hadoop.io">ObjectWritable</a></td>
<td class="colLast">
<div class="block">A polymorphic Writable that writes an instance with it's class name.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/SecureIOUtils.html" title="class in org.apache.hadoop.io">SecureIOUtils</a></td>
<td class="colLast">
<div class="block">This class provides secure APIs for opening and creating files on the local
disk.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io">SequenceFile</a></td>
<td class="colLast">
<div class="block"><code>SequenceFile</code>s are flat files consisting of binary key/value
pairs.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io">SequenceFile.Metadata</a></td>
<td class="colLast">
<div class="block">The class encapsulating with the metadata of a file.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/hadoop/io/SequenceFile.Reader.html" title="class in org.apache.hadoop.io">SequenceFile.Reader</a></td>
<td class="colLast">
<div class="block">Reads key/value pairs from a sequence-format file.</div>
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</tr>
<tr class="rowColor">
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