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<div class="subTitle">org.apache.hadoop.hbase.wal</div>
<h2 title="Interface WAL" class="title">Interface WAL</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="../../../../../org/apache/hadoop/hbase/replication/regionserver/WALFileLengthProvider.html" title="interface in org.apache.hadoop.hbase.replication.regionserver">WALFileLengthProvider</a></dd>
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<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/AbstractFSWAL.html" title="class in org.apache.hadoop.hbase.regionserver.wal">AbstractFSWAL</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html" title="class in org.apache.hadoop.hbase.regionserver.wal">AsyncFSWAL</a>, <a href="../../../../../org/apache/hadoop/hbase/wal/DisabledWALProvider.DisabledWAL.html" title="class in org.apache.hadoop.hbase.wal">DisabledWALProvider.DisabledWAL</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/DualAsyncFSWAL.html" title="class in org.apache.hadoop.hbase.regionserver.wal">DualAsyncFSWAL</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSHLog</a></dd>
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<pre>@InterfaceAudience.Private
@InterfaceStability.Evolving
public interface <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.43">WAL</a>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="../../../../../org/apache/hadoop/hbase/replication/regionserver/WALFileLengthProvider.html" title="interface in org.apache.hadoop.hbase.replication.regionserver">WALFileLengthProvider</a></pre>
<div class="block">A Write Ahead Log (WAL) provides service for reading, writing waledits. This interface provides
APIs for WAL users (such as RegionServer) to use the WAL (do append, sync, etc).
Note that some internals, such as log rolling and performance evaluation tools, will use
WAL.equals to determine if they have already seen a given WAL.</div>
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<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Interface and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a></span></code>
<div class="block">Utility class that lets us keep track of the edit with it's key.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Reader.html" title="interface in org.apache.hadoop.hbase.wal">WAL.Reader</a></span></code>
<div class="block">When outside clients need to consume persisted WALs, they rely on a provided
Reader.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t5" class="tableTab"><span><a href="javascript:show(16);">Default Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#abortCacheFlush-byte:A-">abortCacheFlush</a></span>(byte[]&nbsp;encodedRegionName)</code>
<div class="block">Abort a cache flush.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#appendData-org.apache.hadoop.hbase.client.RegionInfo-org.apache.hadoop.hbase.wal.WALKeyImpl-org.apache.hadoop.hbase.wal.WALEdit-">appendData</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;info,
<a href="../../../../../org/apache/hadoop/hbase/wal/WALKeyImpl.html" title="class in org.apache.hadoop.hbase.wal">WALKeyImpl</a>&nbsp;key,
<a href="../../../../../org/apache/hadoop/hbase/wal/WALEdit.html" title="class in org.apache.hadoop.hbase.wal">WALEdit</a>&nbsp;edits)</code>
<div class="block">Append a set of data edits to the WAL.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#appendMarker-org.apache.hadoop.hbase.client.RegionInfo-org.apache.hadoop.hbase.wal.WALKeyImpl-org.apache.hadoop.hbase.wal.WALEdit-">appendMarker</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;info,
<a href="../../../../../org/apache/hadoop/hbase/wal/WALKeyImpl.html" title="class in org.apache.hadoop.hbase.wal">WALKeyImpl</a>&nbsp;key,
<a href="../../../../../org/apache/hadoop/hbase/wal/WALEdit.html" title="class in org.apache.hadoop.hbase.wal">WALEdit</a>&nbsp;edits)</code>
<div class="block">Append an operational 'meta' event marker edit to the WAL.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#close--">close</a></span>()</code>
<div class="block">Caller no longer needs any edits from this WAL.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#completeCacheFlush-byte:A-long-">completeCacheFlush</a></span>(byte[]&nbsp;encodedRegionName,
long&nbsp;maxFlushedSeqId)</code>
<div class="block">Complete the cache flush.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/WALCoprocessorHost.html" title="class in org.apache.hadoop.hbase.regionserver.wal">WALCoprocessorHost</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#getCoprocessorHost--">getCoprocessorHost</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#getEarliestMemStoreSeqNum-byte:A-">getEarliestMemStoreSeqNum</a></span>(byte[]&nbsp;encodedRegionName)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Since version 1.2.0. Removing because not used and exposes subtle internal
workings. Use <a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#getEarliestMemStoreSeqNum-byte:A-byte:A-"><code>getEarliestMemStoreSeqNum(byte[], byte[])</code></a></span></div>
</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#getEarliestMemStoreSeqNum-byte:A-byte:A-">getEarliestMemStoreSeqNum</a></span>(byte[]&nbsp;encodedRegionName,
byte[]&nbsp;familyName)</code>
<div class="block">Gets the earliest unflushed sequence id in the memstore for the store.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#registerWALActionsListener-org.apache.hadoop.hbase.regionserver.wal.WALActionsListener-">registerWALActionsListener</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/WALActionsListener.html" title="interface in org.apache.hadoop.hbase.regionserver.wal">WALActionsListener</a>&nbsp;listener)</code>
<div class="block">Registers WALActionsListener</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;byte[]&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#rollWriter--">rollWriter</a></span>()</code>
<div class="block">Roll the log writer.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;byte[]&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#rollWriter-boolean-">rollWriter</a></span>(boolean&nbsp;force)</code>
<div class="block">Roll the log writer.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#shutdown--">shutdown</a></span>()</code>
<div class="block">Stop accepting new writes.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#startCacheFlush-byte:A-java.util.Map-">startCacheFlush</a></span>(byte[]&nbsp;encodedRegionName,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;&nbsp;familyToSeq)</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#startCacheFlush-byte:A-java.util.Set-">startCacheFlush</a></span>(byte[]&nbsp;encodedRegionName,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;byte[]&gt;&nbsp;families)</code>
<div class="block">WAL keeps track of the sequence numbers that are as yet not flushed im memstores
in order to be able to do accounting to figure which WALs can be let go.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#sync--">sync</a></span>()</code>
<div class="block">Sync what we have in the WAL.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>default void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#sync-boolean-">sync</a></span>(boolean&nbsp;forceSync)</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#sync-long-">sync</a></span>(long&nbsp;txid)</code>
<div class="block">Sync the WAL if the txId was not already sync'd.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>default void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#sync-long-boolean-">sync</a></span>(long&nbsp;txid,
boolean&nbsp;forceSync)</code>&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#toString--">toString</a></span>()</code>
<div class="block">Human readable identifying information about the state of this WAL.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#unregisterWALActionsListener-org.apache.hadoop.hbase.regionserver.wal.WALActionsListener-">unregisterWALActionsListener</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/WALActionsListener.html" title="interface in org.apache.hadoop.hbase.regionserver.wal">WALActionsListener</a>&nbsp;listener)</code>
<div class="block">Unregisters WALActionsListener</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#updateStore-byte:A-byte:A-java.lang.Long-boolean-">updateStore</a></span>(byte[]&nbsp;encodedRegionName,
byte[]&nbsp;familyName,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;sequenceid,
boolean&nbsp;onlyIfGreater)</code>
<div class="block">updates the seuence number of a specific store.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.hadoop.hbase.replication.regionserver.<a href="../../../../../org/apache/hadoop/hbase/replication/regionserver/WALFileLengthProvider.html" title="interface in org.apache.hadoop.hbase.replication.regionserver">WALFileLengthProvider</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/replication/regionserver/WALFileLengthProvider.html#getLogFileSizeIfBeingWritten-org.apache.hadoop.fs.Path-">getLogFileSizeIfBeingWritten</a></code></li>
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<h4>registerWALActionsListener</h4>
<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.48">registerWALActionsListener</a>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/WALActionsListener.html" title="interface in org.apache.hadoop.hbase.regionserver.wal">WALActionsListener</a>&nbsp;listener)</pre>
<div class="block">Registers WALActionsListener</div>
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<h4>unregisterWALActionsListener</h4>
<pre>boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.53">unregisterWALActionsListener</a>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/WALActionsListener.html" title="interface in org.apache.hadoop.hbase.regionserver.wal">WALActionsListener</a>&nbsp;listener)</pre>
<div class="block">Unregisters WALActionsListener</div>
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<h4>rollWriter</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;byte[]&gt;&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.66">rollWriter</a>()
throws <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/FailedLogCloseException.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FailedLogCloseException</a>,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Roll the log writer. That is, start writing log messages to a new file.
<p/>
The implementation is synchronized in order to make sure there's one rollWriter
running at any given time.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>If lots of logs, flush the stores of returned regions so next time through we
can clean logs. Returns null if nothing to flush. Names are actual
region names as returned by <a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html#getEncodedName--"><code>RegionInfo.getEncodedName()</code></a></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/FailedLogCloseException.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FailedLogCloseException</a></code></dd>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;byte[]&gt;&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.82">rollWriter</a>(boolean&nbsp;force)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Roll the log writer. That is, start writing log messages to a new file.
<p/>
The implementation is synchronized in order to make sure there's one rollWriter
running at any given time.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>force</code> - If true, force creation of a new writer even if no entries have
been written to the current writer</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>If lots of logs, flush the stores of returned regions so next time through we
can clean logs. Returns null if nothing to flush. Names are actual
region names as returned by <a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html#getEncodedName--"><code>RegionInfo.getEncodedName()</code></a></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.88">shutdown</a>()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Stop accepting new writes. If we have unsynced writes still in buffer, sync them.
Extant edits are left in place in backing storage to be replayed later.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.96">close</a>()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Caller no longer needs any edits from this WAL. Implementers are free to reclaim
underlying resources after this call; i.e. filesystem based WALs can archive or
delete files.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
</dl>
</li>
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<pre>long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.113">appendData</a>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;info,
<a href="../../../../../org/apache/hadoop/hbase/wal/WALKeyImpl.html" title="class in org.apache.hadoop.hbase.wal">WALKeyImpl</a>&nbsp;key,
<a href="../../../../../org/apache/hadoop/hbase/wal/WALEdit.html" title="class in org.apache.hadoop.hbase.wal">WALEdit</a>&nbsp;edits)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Append a set of data edits to the WAL. 'Data' here means that the content in the edits will
also have transitioned through the memstore.
<p/>
The WAL is not flushed/sync'd after this transaction completes BUT on return this edit must
have its region edit/sequence id assigned else it messes up our unification of mvcc and
sequenceid. On return <code>key</code> will have the region edit/sequence id filled in.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>info</code> - the regioninfo associated with append</dd>
<dd><code>key</code> - Modified by this call; we add to it this edits region edit/sequence id.</dd>
<dd><code>edits</code> - Edits to append. MAY CONTAIN NO EDITS for case where we want to get an edit
sequence id that is after all currently appended edits.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns a 'transaction id' and <code>key</code> will have the region edit/sequence id
in it.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#appendMarker-org.apache.hadoop.hbase.client.RegionInfo-org.apache.hadoop.hbase.wal.WALKeyImpl-org.apache.hadoop.hbase.wal.WALEdit-"><code>appendMarker(RegionInfo, WALKeyImpl, WALEdit)</code></a></dd>
</dl>
</li>
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<pre>long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.133">appendMarker</a>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;info,
<a href="../../../../../org/apache/hadoop/hbase/wal/WALKeyImpl.html" title="class in org.apache.hadoop.hbase.wal">WALKeyImpl</a>&nbsp;key,
<a href="../../../../../org/apache/hadoop/hbase/wal/WALEdit.html" title="class in org.apache.hadoop.hbase.wal">WALEdit</a>&nbsp;edits)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Append an operational 'meta' event marker edit to the WAL. A marker meta edit could
be a FlushDescriptor, a compaction marker, or a region event marker; e.g. region open
or region close. The difference between a 'marker' append and a 'data' append as in
<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#appendData-org.apache.hadoop.hbase.client.RegionInfo-org.apache.hadoop.hbase.wal.WALKeyImpl-org.apache.hadoop.hbase.wal.WALEdit-"><code>appendData(RegionInfo, WALKeyImpl, WALEdit)</code></a>is that a marker will not have
transitioned through the memstore.
<p/>
The WAL is not flushed/sync'd after this transaction completes BUT on return this edit must
have its region edit/sequence id assigned else it messes up our unification of mvcc and
sequenceid. On return <code>key</code> will have the region edit/sequence id filled in.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>info</code> - the regioninfo associated with append</dd>
<dd><code>key</code> - Modified by this call; we add to it this edits region edit/sequence id.</dd>
<dd><code>edits</code> - Edits to append. MAY CONTAIN NO EDITS for case where we want to get an edit
sequence id that is after all currently appended edits.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns a 'transaction id' and <code>key</code> will have the region edit/sequence id
in it.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#appendData-org.apache.hadoop.hbase.client.RegionInfo-org.apache.hadoop.hbase.wal.WALKeyImpl-org.apache.hadoop.hbase.wal.WALEdit-"><code>appendData(RegionInfo, WALKeyImpl, WALEdit)</code></a></dd>
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<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.140">updateStore</a>(byte[]&nbsp;encodedRegionName,
byte[]&nbsp;familyName,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;sequenceid,
boolean&nbsp;onlyIfGreater)</pre>
<div class="block">updates the seuence number of a specific store.
depending on the flag: replaces current seq number if the given seq id is bigger,
or even if it is lower than existing one</div>
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<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.146">sync</a>()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Sync what we have in the WAL.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.152">sync</a>(long&nbsp;txid)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Sync the WAL if the txId was not already sync'd.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>txid</code> - Transaction id to sync to.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>default&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.158">sync</a>(boolean&nbsp;forceSync)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>forceSync</code> - Flag to force sync rather than flushing to the buffer. Example - Hadoop hflush
vs hsync.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>default&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.167">sync</a>(long&nbsp;txid,
boolean&nbsp;forceSync)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>txid</code> - Transaction id to sync to.</dd>
<dd><code>forceSync</code> - Flag to force sync rather than flushing to the buffer. Example - Hadoop hflush
vs hsync.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.188">startCacheFlush</a>(byte[]&nbsp;encodedRegionName,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;byte[]&gt;&nbsp;families)</pre>
<div class="block">WAL keeps track of the sequence numbers that are as yet not flushed im memstores
in order to be able to do accounting to figure which WALs can be let go. This method tells WAL
that some region is about to flush. The flush can be the whole region or for a column family
of the region only.
<p>Currently, it is expected that the update lock is held for the region; i.e. no
concurrent appends while we set up cache flush.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>families</code> - Families to flush. May be a subset of all families in the region.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns <a href="../../../../../org/apache/hadoop/hbase/HConstants.html#NO_SEQNUM"><code>HConstants.NO_SEQNUM</code></a> if we are flushing the whole region OR if
we are flushing a subset of all families but there are no edits in those families not
being flushed; in other words, this is effectively same as a flush of all of the region
though we were passed a subset of regions. Otherwise, it returns the sequence id of the
oldest/lowest outstanding edit.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#completeCacheFlush-byte:A-long-"><code>completeCacheFlush(byte[], long)</code></a>,
<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#abortCacheFlush-byte:A-"><code>abortCacheFlush(byte[])</code></a></dd>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.190">startCacheFlush</a>(byte[]&nbsp;encodedRegionName,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;&nbsp;familyToSeq)</pre>
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<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.200">completeCacheFlush</a>(byte[]&nbsp;encodedRegionName,
long&nbsp;maxFlushedSeqId)</pre>
<div class="block">Complete the cache flush.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>encodedRegionName</code> - Encoded region name.</dd>
<dd><code>maxFlushedSeqId</code> - The maxFlushedSeqId for this flush. There is no edit in memory that is
less that this sequence id.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#startCacheFlush-byte:A-java.util.Set-"><code>startCacheFlush(byte[], Set)</code></a>,
<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#abortCacheFlush-byte:A-"><code>abortCacheFlush(byte[])</code></a></dd>
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<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.208">abortCacheFlush</a>(byte[]&nbsp;encodedRegionName)</pre>
<div class="block">Abort a cache flush. Call if the flush fails. Note that the only recovery
for an aborted flush currently is a restart of the regionserver so the
snapshot content dropped by the failure gets restored to the memstore.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>encodedRegionName</code> - Encoded region name.</dd>
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<pre><a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/WALCoprocessorHost.html" title="class in org.apache.hadoop.hbase.regionserver.wal">WALCoprocessorHost</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.213">getCoprocessorHost</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Coprocessor host.</dd>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.223">getEarliestMemStoreSeqNum</a>(byte[]&nbsp;encodedRegionName)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Since version 1.2.0. Removing because not used and exposes subtle internal
workings. Use <a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html#getEarliestMemStoreSeqNum-byte:A-byte:A-"><code>getEarliestMemStoreSeqNum(byte[], byte[])</code></a></span></div>
<div class="block">Gets the earliest unflushed sequence id in the memstore for the region.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>encodedRegionName</code> - The region to get the number for.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The earliest/lowest/oldest sequence id if present, HConstants.NO_SEQNUM if absent.</dd>
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<pre>long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.231">getEarliestMemStoreSeqNum</a>(byte[]&nbsp;encodedRegionName,
byte[]&nbsp;familyName)</pre>
<div class="block">Gets the earliest unflushed sequence id in the memstore for the store.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>encodedRegionName</code> - The region to get the number for.</dd>
<dd><code>familyName</code> - The family to get the number for.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The earliest/lowest/oldest sequence id if present, HConstants.NO_SEQNUM if absent.</dd>
</dl>
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<h4>toString</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WAL.html#line.240">toString</a>()</pre>
<div class="block">Human readable identifying information about the state of this WAL.
Implementors are encouraged to include information appropriate for debugging.
Consumers are advised not to rely on the details of the returned String; it does
not have a defined structure.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
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