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<div class="subTitle">org.apache.hadoop.hbase.wal</div>
<h2 title="Interface WALProvider" class="title">Interface WALProvider</h2>
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<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/wal/AbstractFSWALProvider.html" title="class in org.apache.hadoop.hbase.wal">AbstractFSWALProvider</a>, <a href="../../../../../org/apache/hadoop/hbase/wal/AsyncFSWALProvider.html" title="class in org.apache.hadoop.hbase.wal">AsyncFSWALProvider</a>, <a href="../../../../../org/apache/hadoop/hbase/wal/DisabledWALProvider.html" title="class in org.apache.hadoop.hbase.wal">DisabledWALProvider</a>, <a href="../../../../../org/apache/hadoop/hbase/wal/FSHLogProvider.html" title="class in org.apache.hadoop.hbase.wal">FSHLogProvider</a>, <a href="../../../../../org/apache/hadoop/hbase/wal/RegionGroupingProvider.html" title="class in org.apache.hadoop.hbase.wal">RegionGroupingProvider</a>, <a href="../../../../../org/apache/hadoop/hbase/wal/SyncReplicationWALProvider.html" title="class in org.apache.hadoop.hbase.wal">SyncReplicationWALProvider</a></dd>
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<pre>@InterfaceAudience.Private
public interface <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.43">WALProvider</a></pre>
<div class="block">The Write Ahead Log (WAL) stores all durable edits to the HRegion. This interface provides the
entry point for all WAL implementors.
<p>
See <a href="../../../../../org/apache/hadoop/hbase/wal/FSHLogProvider.html" title="class in org.apache.hadoop.hbase.wal"><code>FSHLogProvider</code></a> for an example implementation. A single WALProvider will be used for
retrieving multiple WALs in a particular region server and must be threadsafe.</div>
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<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 interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a></span></code>&nbsp;</td>
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<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/WALProvider.Writer.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.Writer</a></span></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.WriterBase.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.WriterBase</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html#addWALActionsListener-org.apache.hadoop.hbase.regionserver.wal.WALActionsListener-">addWALActionsListener</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">Add a <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/WALActionsListener.html" title="interface in org.apache.hadoop.hbase.regionserver.wal"><code>WALActionsListener</code></a>.</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html#close--">close</a></span>()</code>
<div class="block">shutdown utstanding WALs and clean up any persisted state.</div>
</td>
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<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/WALProvider.html#getLogFileSize--">getLogFileSize</a></span>()</code>
<div class="block">Get size of the log files this provider is managing</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html#getNumLogFiles--">getNumLogFiles</a></span>()</code>
<div class="block">Get number of the log files this provider is managing</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html" title="interface in org.apache.hadoop.hbase.wal">WAL</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html#getWAL-org.apache.hadoop.hbase.client.RegionInfo-">getWAL</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;region)</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>default <a href="../../../../../org/apache/hadoop/hbase/replication/regionserver/WALFileLengthProvider.html" title="interface in org.apache.hadoop.hbase.replication.regionserver">WALFileLengthProvider</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html#getWALFileLengthProvider--">getWALFileLengthProvider</a></span>()</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code><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;<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html" title="interface in org.apache.hadoop.hbase.wal">WAL</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html#getWALs--">getWALs</a></span>()</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html#init-org.apache.hadoop.hbase.wal.WALFactory-org.apache.hadoop.conf.Configuration-java.lang.String-org.apache.hadoop.hbase.Abortable-">init</a></span>(<a href="../../../../../org/apache/hadoop/hbase/wal/WALFactory.html" title="class in org.apache.hadoop.hbase.wal">WALFactory</a>&nbsp;factory,
org.apache.hadoop.conf.Configuration&nbsp;conf,
<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;providerId,
<a href="../../../../../org/apache/hadoop/hbase/Abortable.html" title="interface in org.apache.hadoop.hbase">Abortable</a>&nbsp;server)</code>
<div class="block">Set up the provider to create wals.</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/WALProvider.html#shutdown--">shutdown</a></span>()</code>
<div class="block">persist outstanding WALs to storage and stop accepting new appends.</div>
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<h3>Method Detail</h3>
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<h4>init</h4>
<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.51">init</a>(<a href="../../../../../org/apache/hadoop/hbase/wal/WALFactory.html" title="class in org.apache.hadoop.hbase.wal">WALFactory</a>&nbsp;factory,
org.apache.hadoop.conf.Configuration&nbsp;conf,
<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;providerId,
<a href="../../../../../org/apache/hadoop/hbase/Abortable.html" title="interface in org.apache.hadoop.hbase">Abortable</a>&nbsp;server)
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">Set up the provider to create wals. will only be called once per instance.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>factory</code> - factory that made us may not be null</dd>
<dd><code>conf</code> - may not be null</dd>
<dd><code>providerId</code> - differentiate between providers from one factory. may be null</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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<h4>getWAL</h4>
<pre><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html" title="interface in org.apache.hadoop.hbase.wal">WAL</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.58">getWAL</a>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;region)
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>region</code> - the region which we want to get a WAL for it. Could be null.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a WAL for writing entries for the given region.</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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<h4>getWALs</h4>
<pre><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;<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html" title="interface in org.apache.hadoop.hbase.wal">WAL</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.63">getWALs</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the List of WALs that are used by this server</dd>
</dl>
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<h4>shutdown</h4>
<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.70">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">persist outstanding WALs to storage and stop accepting new appends. This method serves as
shorthand for sending a sync to every WAL provided by a given implementation. Those WALs will
also stop accepting new writes.</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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<h4>close</h4>
<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.77">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">shutdown utstanding WALs and clean up any persisted state. Call this method only when you will
not need to replay any of the edits to the WALs from this provider. After this call completes,
the underlying resources should have been reclaimed.</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>long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.116">getNumLogFiles</a>()</pre>
<div class="block">Get number of the log files this provider is managing</div>
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<h4>getLogFileSize</h4>
<pre>long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.121">getLogFileSize</a>()</pre>
<div class="block">Get size of the log files this provider is managing</div>
</li>
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<a name="addWALActionsListener-org.apache.hadoop.hbase.regionserver.wal.WALActionsListener-">
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<h4>addWALActionsListener</h4>
<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.130">addWALActionsListener</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">Add a <a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/WALActionsListener.html" title="interface in org.apache.hadoop.hbase.regionserver.wal"><code>WALActionsListener</code></a>.
<p>
Notice that you must call this method before calling <a href="../../../../../org/apache/hadoop/hbase/wal/WALProvider.html#getWAL-org.apache.hadoop.hbase.client.RegionInfo-"><code>getWAL(RegionInfo)</code></a> as this method
will not effect the <a href="../../../../../org/apache/hadoop/hbase/wal/WAL.html" title="interface in org.apache.hadoop.hbase.wal"><code>WAL</code></a> which has already been created. And as long as we can only it
when initialization, it is not thread safe.</div>
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<h4>getWALFileLengthProvider</h4>
<pre>default&nbsp;<a href="../../../../../org/apache/hadoop/hbase/replication/regionserver/WALFileLengthProvider.html" title="interface in org.apache.hadoop.hbase.replication.regionserver">WALFileLengthProvider</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALProvider.html#line.132">getWALFileLengthProvider</a>()</pre>
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