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<h1 title="Package" class="title">Package&nbsp;org.apache.hadoop.hbase.wal</h1>
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<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/AbstractFSWALProvider.Reader.html" title="interface in org.apache.hadoop.hbase.wal">AbstractFSWALProvider.Reader</a></td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/AsyncFSWALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">AsyncFSWALProvider.AsyncWriter</a></td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/FSHLogProvider.Writer.html" title="interface in org.apache.hadoop.hbase.wal">FSHLogProvider.Writer</a></td>
<td class="colLast">&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/RegionGroupingProvider.RegionGroupingStrategy.html" title="interface in org.apache.hadoop.hbase.wal">RegionGroupingProvider.RegionGroupingStrategy</a></td>
<td class="colLast">
<div class="block">Map identifiers to a group number.</div>
</td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html" title="interface in org.apache.hadoop.hbase.wal">WAL</a></td>
<td class="colLast">
<div class="block">A Write Ahead Log (WAL) provides service for reading, writing waledits.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Reader.html" title="interface in org.apache.hadoop.hbase.wal">WAL.Reader</a></td>
<td class="colLast">
<div class="block">When outside clients need to consume persisted WALs, they rely on a provided
Reader.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALKey.html" title="interface in org.apache.hadoop.hbase.wal">WALKey</a></td>
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<div class="block">Key for WAL Entry.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider</a></td>
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<div class="block">The Write Ahead Log (WAL) stores all durable edits to the HRegion.</div>
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<th class="colFirst" scope="col">Class</th>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/AbstractFSWALProvider.html" title="class in org.apache.hadoop.hbase.wal">AbstractFSWALProvider</a>&lt;T extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/AbstractFSWAL.html" title="class in org.apache.hadoop.hbase.regionserver.wal">AbstractFSWAL</a>&lt;?&gt;&gt;</td>
<td class="colLast">
<div class="block">Base class of a WAL Provider that returns a single thread safe WAL that writes to Hadoop FS.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/AbstractFSWALProvider.WALStartTimeComparator.html" title="class in org.apache.hadoop.hbase.wal">AbstractFSWALProvider.WALStartTimeComparator</a></td>
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<div class="block">Comparator used to compare WAL files together based on their start time.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/AbstractRecoveredEditsOutputSink.html" title="class in org.apache.hadoop.hbase.wal">AbstractRecoveredEditsOutputSink</a></td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/AbstractWALRoller.html" title="class in org.apache.hadoop.hbase.wal">AbstractWALRoller</a>&lt;T extends <a href="../../../../../org/apache/hadoop/hbase/Abortable.html" title="interface in org.apache.hadoop.hbase">Abortable</a>&gt;</td>
<td class="colLast">
<div class="block">Runs periodically to determine if the WAL should be rolled.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/AsyncFSWALProvider.html" title="class in org.apache.hadoop.hbase.wal">AsyncFSWALProvider</a></td>
<td class="colLast">
<div class="block">A WAL provider that use <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html" title="class in org.apache.hadoop.hbase.regionserver.wal"><code>AsyncFSWAL</code></a>.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/BoundedEntryBuffers.html" title="class in org.apache.hadoop.hbase.wal">BoundedEntryBuffers</a></td>
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<div class="block">Used for <a href="../../../../../org/apache/hadoop/hbase/wal/BoundedRecoveredEditsOutputSink.html" title="class in org.apache.hadoop.hbase.wal"><code>BoundedRecoveredEditsOutputSink</code></a>.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/BoundedGroupingStrategy.html" title="class in org.apache.hadoop.hbase.wal">BoundedGroupingStrategy</a></td>
<td class="colLast">
<div class="block">A WAL grouping strategy that limits the number of wal groups to
"hbase.wal.regiongrouping.numgroups".</div>
</td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/BoundedRecoveredEditsOutputSink.html" title="class in org.apache.hadoop.hbase.wal">BoundedRecoveredEditsOutputSink</a></td>
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<div class="block">Class that manages the output streams from the log splitting process.</div>
</td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/BoundedRecoveredHFilesOutputSink.html" title="class in org.apache.hadoop.hbase.wal">BoundedRecoveredHFilesOutputSink</a></td>
<td class="colLast">
<div class="block">A WALSplitter sink that outputs <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>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/DisabledWALProvider.html" title="class in org.apache.hadoop.hbase.wal">DisabledWALProvider</a></td>
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<div class="block">No-op implementation of <a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html" title="interface in org.apache.hadoop.hbase.wal"><code>WALProvider</code></a> used when the WAL is disabled.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/EntryBuffers.html" title="class in org.apache.hadoop.hbase.wal">EntryBuffers</a></td>
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<div class="block">Class which accumulates edits and separates them into a buffer per region while simultaneously
accounting RAM usage.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/EntryBuffers.RegionEntryBuffer.html" title="class in org.apache.hadoop.hbase.wal">EntryBuffers.RegionEntryBuffer</a></td>
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<div class="block">A buffer of some number of edits for a given region.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/FSHLogProvider.html" title="class in org.apache.hadoop.hbase.wal">FSHLogProvider</a></td>
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<div class="block">A WAL provider that use <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.html" title="class in org.apache.hadoop.hbase.regionserver.wal"><code>FSHLog</code></a>.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/NamespaceGroupingStrategy.html" title="class in org.apache.hadoop.hbase.wal">NamespaceGroupingStrategy</a></td>
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<div class="block">A WAL grouping strategy based on namespace.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/NettyAsyncFSWALConfigHelper.html" title="class in org.apache.hadoop.hbase.wal">NettyAsyncFSWALConfigHelper</a></td>
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<div class="block">Helper class for passing netty event loop config to <a href="../../../../../org/apache/hadoop/hbase/wal/AsyncFSWALProvider.html" title="class in org.apache.hadoop.hbase.wal"><code>AsyncFSWALProvider</code></a>.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/OutputSink.html" title="class in org.apache.hadoop.hbase.wal">OutputSink</a></td>
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<div class="block">The following class is an abstraction class to provide a common interface to support different
ways of consuming recovered edits.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/OutputSink.WriterThread.html" title="class in org.apache.hadoop.hbase.wal">OutputSink.WriterThread</a></td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/RecoveredEditsOutputSink.html" title="class in org.apache.hadoop.hbase.wal">RecoveredEditsOutputSink</a></td>
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<div class="block">Class that manages the output streams from the log splitting process.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/RegionGroupingProvider.html" title="class in org.apache.hadoop.hbase.wal">RegionGroupingProvider</a></td>
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<div class="block">A WAL Provider that returns a WAL per group of regions.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/RegionGroupingProvider.IdentityGroupingStrategy.html" title="class in org.apache.hadoop.hbase.wal">RegionGroupingProvider.IdentityGroupingStrategy</a></td>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/SyncReplicationWALProvider.html" title="class in org.apache.hadoop.hbase.wal">SyncReplicationWALProvider</a></td>
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<div class="block">The special <a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html" title="interface in org.apache.hadoop.hbase.wal"><code>WALProvider</code></a> for synchronous replication.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a></td>
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<div class="block">Utility class that lets us keep track of the edit with it's key.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALEdit.html" title="class in org.apache.hadoop.hbase.wal">WALEdit</a></td>
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<div class="block">Used in HBase's transaction log (WAL) to represent a collection of edits (Cell/KeyValue objects)
that came in as a single transaction.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALFactory.html" title="class in org.apache.hadoop.hbase.wal">WALFactory</a></td>
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<div class="block">Entry point for users of the Write Ahead Log.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALKeyImpl.html" title="class in org.apache.hadoop.hbase.wal">WALKeyImpl</a></td>
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<div class="block">Default implementation of Key for an Entry in the WAL.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALPrettyPrinter.html" title="class in org.apache.hadoop.hbase.wal">WALPrettyPrinter</a></td>
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<div class="block">WALPrettyPrinter prints the contents of a given WAL with a variety of
options affecting formatting and extent of content.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALSplitter.html" title="class in org.apache.hadoop.hbase.wal">WALSplitter</a></td>
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<div class="block">Split RegionServer WAL files.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALSplitter.PipelineController.html" title="class in org.apache.hadoop.hbase.wal">WALSplitter.PipelineController</a></td>
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<div class="block">Contains some methods to control WAL-entries producer / consumer interactions</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALSplitter.SplitWALResult.html" title="class in org.apache.hadoop.hbase.wal">WALSplitter.SplitWALResult</a></td>
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<div class="block">Data structure returned as result by #splitWAL(FileStatus, CancelableProgressable).</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALSplitUtil.html" title="class in org.apache.hadoop.hbase.wal">WALSplitUtil</a></td>
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<div class="block">This class provides static methods to support WAL splitting related works</div>
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<div class="block">A struct used by getMutationsFromWALEntry</div>
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<th class="colFirst" scope="col">Enum</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/RegionGroupingProvider.Strategies.html" title="enum in org.apache.hadoop.hbase.wal">RegionGroupingProvider.Strategies</a></td>
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<div class="block">Maps between configuration names for strategies and implementation classes.</div>
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<td class="colFirst"><a href="../../../../../org/apache/hadoop/hbase/wal/WALFactory.Providers.html" title="enum in org.apache.hadoop.hbase.wal">WALFactory.Providers</a></td>
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<div class="block">Maps between configuration names for providers and implementation classes.</div>
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