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<h1 title="Package" class="title">Package&nbsp;org.apache.hadoop.hbase.io.hfile</h1>
<div class="docSummary">
<div class="block">Provides implementations of <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> and HFile
<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>BlockCache</code></a>.</div>
</div>
<p>See:&nbsp;<a href="#package.description">Description</a></p>
</div>
<div class="contentContainer">
<ul class="blockList">
<li class="blockList">
<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation">
<caption><span>Interface Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a></td>
<td class="colLast">
<div class="block">Block cache interface.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a></td>
<td class="colLast">
<div class="block">Cacheable is an interface that allows for an object to be cached.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheableDeserializer.html" title="interface in org.apache.hadoop.hbase.io.hfile">CacheableDeserializer</a>&lt;T extends <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&gt;</td>
<td class="colLast">
<div class="block">Interface for a deserializer.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CachedBlock.html" title="interface in org.apache.hadoop.hbase.io.hfile">CachedBlock</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">FirstLevelBlockCache</a></td>
<td class="colLast">
<div class="block">In-memory BlockCache that may be backed by secondary layer(s).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.CachingBlockReader.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFile.CachingBlockReader</a></td>
<td class="colLast">
<div class="block">An abstraction used by the block index.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.Reader.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFile.Reader</a></td>
<td class="colLast">
<div class="block">An interface used by clients to open and iterate an <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.Writer.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFile.Writer</a></td>
<td class="colLast">
<div class="block">API required to write an <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a></div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileBlock.BlockIterator</a></td>
<td class="colLast">
<div class="block">Iterator for reading <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFileBlock</code></a>s in load-on-open-section, such as root data index
block, meta index block, file info block etc.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockWritable.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileBlock.BlockWritable</a></td>
<td class="colLast">
<div class="block">Something that can be written into a block.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.FSReader.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileBlock.FSReader</a></td>
<td class="colLast">
<div class="block">An HFile block reader with iteration ability.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileDataBlockEncoder.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileDataBlockEncoder</a></td>
<td class="colLast">
<div class="block">Controls what kind of data block encoding is used.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileScanner.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileScanner</a></td>
<td class="colLast">
<div class="block">A scanner allows you to position yourself within a HFile and
scan through it.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/InlineBlockWriter.html" title="interface in org.apache.hadoop.hbase.io.hfile">InlineBlockWriter</a></td>
<td class="colLast">
<div class="block">A way to write "inline" blocks into an <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ResizableBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">ResizableBlockCache</a></td>
<td class="colLast">
<div class="block">BlockCache which is resizable.</div>
</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList">
<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation">
<caption><span>Class Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/AgeSnapshot.html" title="class in org.apache.hadoop.hbase.io.hfile">AgeSnapshot</a></td>
<td class="colLast">
<div class="block">Snapshot of block cache age in cache.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheFactory.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheFactory</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a></td>
<td class="colLast">
<div class="block">Cache Key for use with implementations of <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>BlockCache</code></a></div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCachesIterator.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCachesIterator</a></td>
<td class="colLast">
<div class="block">Iterator over an array of BlockCache CachedBlocks.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheUtil</a></td>
<td class="colLast">
<div class="block">Utilty for aggregating counts in CachedBlocks and toString/toJSON CachedBlocks and BlockCaches.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.CachedBlockCountsPerFile.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheUtil.CachedBlockCountsPerFile</a></td>
<td class="colLast">
<div class="block">Little data structure to hold counts for a file.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.CachedBlocksByFile.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheUtil.CachedBlocksByFile</a></td>
<td class="colLast">
<div class="block">Use one of these to keep a running account of cached blocks by file.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockWithScanInfo.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockWithScanInfo</a></td>
<td class="colLast">
<div class="block">BlockWithScanInfo is wrapper class for HFileBlock with other attributes.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheableDeserializerIdManager.html" title="class in org.apache.hadoop.hbase.io.hfile">CacheableDeserializerIdManager</a></td>
<td class="colLast">
<div class="block">This class is used to manage the identifiers for <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheableDeserializer.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>CacheableDeserializer</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheConfig.html" title="class in org.apache.hadoop.hbase.io.hfile">CacheConfig</a></td>
<td class="colLast">
<div class="block">Stores all of the cache objects and configuration for a single HFile.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheStats.html" title="class in org.apache.hadoop.hbase.io.hfile">CacheStats</a></td>
<td class="colLast">
<div class="block">Class that implements cache metrics.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html" title="class in org.apache.hadoop.hbase.io.hfile">ChecksumUtil</a></td>
<td class="colLast">
<div class="block">Utility methods to compute and validate checksums.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CombinedBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile">CombinedBlockCache</a></td>
<td class="colLast">
<div class="block">CombinedBlockCache is an abstraction layer that combines
<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>FirstLevelBlockCache</code></a> and <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket"><code>BucketCache</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CombinedBlockCache.CombinedCacheStats.html" title="class in org.apache.hadoop.hbase.io.hfile">CombinedBlockCache.CombinedCacheStats</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CompoundBloomFilter.html" title="class in org.apache.hadoop.hbase.io.hfile">CompoundBloomFilter</a></td>
<td class="colLast">
<div class="block">A Bloom filter implementation built on top of
<a href="../../../../../../org/apache/hadoop/hbase/util/BloomFilterChunk.html" title="class in org.apache.hadoop.hbase.util"><code>BloomFilterChunk</code></a>, encapsulating
a set of fixed-size Bloom filters written out at the time of
<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> generation into the data
block stream, and loaded on demand at query time.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CompoundBloomFilterBase.html" title="class in org.apache.hadoop.hbase.io.hfile">CompoundBloomFilterBase</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CompoundBloomFilterWriter.html" title="class in org.apache.hadoop.hbase.io.hfile">CompoundBloomFilterWriter</a></td>
<td class="colLast">
<div class="block">Adds methods required for writing a compound Bloom filter to the data
section of an <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> to the
<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CompoundBloomFilter.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>CompoundBloomFilter</code></a> class.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CompoundBloomFilterWriter.ReadyChunk.html" title="class in org.apache.hadoop.hbase.io.hfile">CompoundBloomFilterWriter.ReadyChunk</a></td>
<td class="colLast">
<div class="block">A Bloom filter chunk enqueued for writing</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ExclusiveMemHFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">ExclusiveMemHFileBlock</a></td>
<td class="colLast">
<div class="block">The <a href="../../../../../../org/apache/hadoop/hbase/io/ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io"><code>ByteBuffAllocator</code></a> won't allocate pooled heap <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio"><code>ByteBuff</code></a> now; at the same time,
if allocate an off-heap <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio"><code>ByteBuff</code></a> from allocator, then it must be a pooled one.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.html" title="class in org.apache.hadoop.hbase.io.hfile">FixedFileTrailer</a></td>
<td class="colLast">
<div class="block">The <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> has a fixed trailer which contains offsets to other
variable parts of the file.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile">HFile</a></td>
<td class="colLast">
<div class="block">File format for hbase.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.WriterFactory.html" title="class in org.apache.hadoop.hbase.io.hfile">HFile.WriterFactory</a></td>
<td class="colLast">
<div class="block">This variety of ways to construct writers is used throughout the code, and
we want to be able to swap writer implementations.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></td>
<td class="colLast">
<div class="block">Cacheable Blocks of an <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> version 2 file.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockDeserializer.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.BlockDeserializer</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.FSReaderImpl.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.FSReaderImpl</a></td>
<td class="colLast">
<div class="block">Reads version 2 HFile blocks from the filesystem.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.Header.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.Header</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.PrefetchedHeader.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.PrefetchedHeader</a></td>
<td class="colLast">
<div class="block">Data-structure to use caching the header of the NEXT block.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.Writer.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.Writer</a></td>
<td class="colLast">
<div class="block">Unified version 2 <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> block writer.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockBuilder.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlockBuilder</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlockIndex</a></td>
<td class="colLast">
<div class="block">Provides functionality to write (<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.BlockIndexWriter.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFileBlockIndex.BlockIndexWriter</code></a>) and read
BlockIndexReader
single-level and multi-level block indexes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.BlockIndexChunk.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlockIndex.BlockIndexChunk</a></td>
<td class="colLast">
<div class="block">A single chunk of the block index in the process of writing.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.BlockIndexReader.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlockIndex.BlockIndexReader</a></td>
<td class="colLast">
<div class="block">The reader will always hold the root level index in the memory.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.BlockIndexWriter.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlockIndex.BlockIndexWriter</a></td>
<td class="colLast">
<div class="block">Writes the block index into the output stream.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.ByteArrayKeyBlockIndexReader.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlockIndex.ByteArrayKeyBlockIndexReader</a></td>
<td class="colLast">
<div class="block">An implementation of the BlockIndexReader that deals with block keys which are plain
byte[] like MetaBlock or the Bloom Block for ROW bloom.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.CellBasedKeyBlockIndexReader.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlockIndex.CellBasedKeyBlockIndexReader</a></td>
<td class="colLast">
<div class="block">An implementation of the BlockIndexReader that deals with block keys which are the key
part of a cell like the Data block index or the ROW_COL bloom blocks
This needs a comparator to work with the Cells</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileContext.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContext</a></td>
<td class="colLast">
<div class="block">Read-only HFile Context Information.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileContextBuilder.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContextBuilder</a></td>
<td class="colLast">
<div class="block">A builder that helps in building up the HFileContext</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileDataBlockEncoderImpl.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileDataBlockEncoderImpl</a></td>
<td class="colLast">
<div class="block">Do different kinds of data block encoding according to column family
options.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileInfo.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileInfo</a></td>
<td class="colLast">
<div class="block">Metadata Map of attributes for HFile written out as HFile Trailer.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFilePreadReader.html" title="class in org.apache.hadoop.hbase.io.hfile">HFilePreadReader</a></td>
<td class="colLast">
<div class="block">Implementation of <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.Reader.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>HFile.Reader</code></a> to deal with pread.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFilePrettyPrinter.html" title="class in org.apache.hadoop.hbase.io.hfile">HFilePrettyPrinter</a></td>
<td class="colLast">
<div class="block">Implements pretty-printing functionality for <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a>s.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFilePrettyPrinter.KeyValueStatsCollector.html" title="class in org.apache.hadoop.hbase.io.hfile">HFilePrettyPrinter.KeyValueStatsCollector</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFilePrettyPrinter.SimpleReporter.html" title="class in org.apache.hadoop.hbase.io.hfile">HFilePrettyPrinter.SimpleReporter</a></td>
<td class="colLast">
<div class="block">Almost identical to ConsoleReporter, but extending ScheduledReporter,
as extending ConsoleReporter in this version of dropwizard is now too much trouble.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFilePrettyPrinter.SimpleReporter.Builder.html" title="class in org.apache.hadoop.hbase.io.hfile">HFilePrettyPrinter.SimpleReporter.Builder</a></td>
<td class="colLast">
<div class="block">A builder for <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFilePrettyPrinter.SimpleReporter.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFilePrettyPrinter.SimpleReporter</code></a> instances.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileReaderImpl</a></td>
<td class="colLast">
<div class="block">Implementation that can handle all hfile versions of <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.Reader.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>HFile.Reader</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.EncodedScanner.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileReaderImpl.EncodedScanner</a></td>
<td class="colLast">
<div class="block">Scanner that operates on encoded data blocks.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.HFileScannerImpl.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileReaderImpl.HFileScannerImpl</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileStreamReader.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileStreamReader</a></td>
<td class="colLast">
<div class="block">Implementation of <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.Reader.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>HFile.Reader</code></a> to deal with stream read
do not perform any prefetch operations (HFilePreadReader will do this).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileUtil.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileUtil</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileWriterImpl.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileWriterImpl</a></td>
<td class="colLast">
<div class="block">Common functionality needed by all versions of <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> writers.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/InclusiveCombinedBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile">InclusiveCombinedBlockCache</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile">LruAdaptiveBlockCache</a></td>
<td class="colLast">
<div class="block"><b>This realisation improve performance of classical LRU
cache up to 3 times via reduce GC job.</b></div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.EvictionThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruAdaptiveBlockCache.EvictionThread</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.StatisticsThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruAdaptiveBlockCache.StatisticsThread</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile">LruBlockCache</a></td>
<td class="colLast">
<div class="block">A block cache implementation that is memory-aware using <a href="../../../../../../org/apache/hadoop/hbase/io/HeapSize.html" title="interface in org.apache.hadoop.hbase.io"><code>HeapSize</code></a>, memory-bound using an
LRU eviction algorithm, and concurrent: backed by a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent"><code>ConcurrentHashMap</code></a> and with a
non-blocking eviction thread giving constant-time <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#cacheBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.Cacheable-boolean-"><code>LruBlockCache.cacheBlock(org.apache.hadoop.hbase.io.hfile.BlockCacheKey, org.apache.hadoop.hbase.io.hfile.Cacheable, boolean)</code></a> and <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#getBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-boolean-boolean-boolean-"><code>LruBlockCache.getBlock(org.apache.hadoop.hbase.io.hfile.BlockCacheKey, boolean, boolean, boolean)</code></a>
operations.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.EvictionThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruBlockCache.EvictionThread</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.StatisticsThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruBlockCache.StatisticsThread</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">LruCachedBlock</a></td>
<td class="colLast">
<div class="block">Represents an entry in the <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>LruBlockCache</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlockQueue.html" title="class in org.apache.hadoop.hbase.io.hfile">LruCachedBlockQueue</a></td>
<td class="colLast">
<div class="block">A memory-bound queue that will grow until an element brings
total size &gt;= maxSize.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile">MemcachedBlockCache</a></td>
<td class="colLast">
<div class="block">Class to store blocks into memcached.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.HFileBlockTranscoder.html" title="class in org.apache.hadoop.hbase.io.hfile">MemcachedBlockCache.HFileBlockTranscoder</a></td>
<td class="colLast">
<div class="block">Class to encode and decode an HFileBlock to and from memecached's resulting byte arrays.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/NoOpDataBlockEncoder.html" title="class in org.apache.hadoop.hbase.io.hfile">NoOpDataBlockEncoder</a></td>
<td class="colLast">
<div class="block">Does not perform any kind of encoding/decoding.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/NoOpDataBlockEncoder.NoneEncodingState.html" title="class in org.apache.hadoop.hbase.io.hfile">NoOpDataBlockEncoder.NoneEncodingState</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/PrefetchExecutor.html" title="class in org.apache.hadoop.hbase.io.hfile">PrefetchExecutor</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ReaderContext.html" title="class in org.apache.hadoop.hbase.io.hfile">ReaderContext</a></td>
<td class="colLast">
<div class="block">Carries the information on some of the meta data about the HFile Reader</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ReaderContextBuilder.html" title="class in org.apache.hadoop.hbase.io.hfile">ReaderContextBuilder</a></td>
<td class="colLast">
<div class="block">A builder that helps in building up the ReaderContext</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/SharedMemHFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">SharedMemHFileBlock</a></td>
<td class="colLast">
<div class="block">The <a href="../../../../../../org/apache/hadoop/hbase/io/ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io"><code>ByteBuffAllocator</code></a> won't allocate pooled heap <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio"><code>ByteBuff</code></a> now; at the same time,
if allocate an off-heap <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio"><code>ByteBuff</code></a> from allocator, then it must be a pooled one.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/TinyLfuBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile">TinyLfuBlockCache</a></td>
<td class="colLast">
<div class="block">A block cache that is memory-aware using <a href="../../../../../../org/apache/hadoop/hbase/io/HeapSize.html" title="interface in org.apache.hadoop.hbase.io"><code>HeapSize</code></a>, memory bounded using the W-TinyLFU
eviction algorithm, and concurrent.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/TinyLfuBlockCache.CachedBlockView.html" title="class in org.apache.hadoop.hbase.io.hfile">TinyLfuBlockCache.CachedBlockView</a></td>
<td class="colLast">&nbsp;</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList">
<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Enum Summary table, listing enums, and an explanation">
<caption><span>Enum Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Enum</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheFactory.ExternalBlockCaches.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockCacheFactory.ExternalBlockCaches</a></td>
<td class="colLast">
<div class="block">Enum of all built in external block caches.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockPriority.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockPriority</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType</a></td>
<td class="colLast">
<div class="block">Various types of HFile blocks.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.BlockCategory.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType.BlockCategory</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.Writer.State.html" title="enum in org.apache.hadoop.hbase.io.hfile">HFileBlock.Writer.State</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ReaderContext.ReaderType.html" title="enum in org.apache.hadoop.hbase.io.hfile">ReaderContext.ReaderType</a></td>
<td class="colLast">&nbsp;</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList">
<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Exception Summary table, listing exceptions, and an explanation">
<caption><span>Exception Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Exception</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CorruptHFileException.html" title="class in org.apache.hadoop.hbase.io.hfile">CorruptHFileException</a></td>
<td class="colLast">
<div class="block">This exception is thrown when attempts to read an HFile fail due to corruption or truncation
issues.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.BlockIndexNotLoadedException.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileReaderImpl.BlockIndexNotLoadedException</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.NotSeekedException.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileReaderImpl.NotSeekedException</a></td>
<td class="colLast">
<div class="block">An exception thrown when an operation requiring a scanner to be seeked
is invoked on a scanner that is not seeked.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/InvalidHFileException.html" title="class in org.apache.hadoop.hbase.io.hfile">InvalidHFileException</a></td>
<td class="colLast">
<div class="block">Thrown when an invalid HFile format is detected</div>
</td>
</tr>
</tbody>
</table>
</li>
</ul>
<a name="package.description">
<!-- -->
</a>
<h2 title="Package org.apache.hadoop.hbase.io.hfile Description">Package org.apache.hadoop.hbase.io.hfile Description</h2>
<div class="block">Provides implementations of <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> and HFile
<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>BlockCache</code></a>. Caches are configured (and instantiated)
by <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheConfig.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>CacheConfig</code></a>. See head of the
<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheConfig.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>CacheConfig</code></a> class for constants that define
cache options and configuration keys to use setting cache options. Cache implementations
include the default, native on-heap <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>LruBlockCache</code></a> and a
<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket"><code>BucketCache</code></a> that has a bunch of deploy formats
including acting as a L2 for LruBlockCache -- when a block is evicted from LruBlockCache, it
goes to the BucketCache and when we search a block, we look in both places -- or, the
most common deploy type,
using <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CombinedBlockCache.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>CombinedBlockCache</code></a>, BucketCache is used as
a host for data blocks with meta blocks in an instance of LruBlockCache. BucketCache
can also be onheap, offheap, and file-backed.
<h1>Which BlockCache should I use?</h1>
By default LruBlockCache is on. If you would like to cache more, and offheap (offheap
usually means less GC headache), try enabling * BucketCache. Fetching will always
be slower when fetching from BucketCache but latencies tend to be less erratic over time
(roughly because GC is less). See Nick Dimiduk's
<a href="http://www.n10k.com/blog/blockcache-101/">BlockCache 101</a> for some numbers.
<h1>Enabling <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket"><code>BucketCache</code></a></h1>
See the HBase Reference Guide <a href="http://hbase.apache.org/book.html#enable.bucketcache">Enable BucketCache</a>.</div>
</div>
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