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| <h2 title="Class CombinedAsyncWriter" class="title">Class CombinedAsyncWriter</h2> |
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| <li>org.apache.hadoop.hbase.regionserver.wal.CombinedAsyncWriter</li> |
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| <pre>@InterfaceAudience.Private |
| public final class <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.37">CombinedAsyncWriter</a> |
| extends <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> |
| implements <a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a></pre> |
| <div class="block">An <a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal"><code>WALProvider.AsyncWriter</code></a> wrapper which writes data to a set of <a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal"><code>WALProvider.AsyncWriter</code></a> instances.</div> |
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| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList<<a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#writers">writers</a></span></code> </td> |
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| <td class="colFirst"><code>private </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#CombinedAsyncWriter-org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList-">CombinedAsyncWriter</a></span>(org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList<<a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a>> writers)</code> </td> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
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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/regionserver/wal/CombinedAsyncWriter.html#append-org.apache.hadoop.hbase.wal.WAL.Entry-">append</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> entry)</code> </td> |
| </tr> |
| <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/regionserver/wal/CombinedAsyncWriter.html#close--">close</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html" title="class in org.apache.hadoop.hbase.regionserver.wal">CombinedAsyncWriter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#create-org.apache.hadoop.hbase.wal.WALProvider.AsyncWriter-org.apache.hadoop.hbase.wal.WALProvider.AsyncWriter...-">create</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a> writer, |
| <a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a>... writers)</code> </td> |
| </tr> |
| <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/regionserver/wal/CombinedAsyncWriter.html#getLength--">getLength</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#getSyncedLength--">getSyncedLength</a></span>()</code> |
| <div class="block">NOTE: We add this method for <a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/WALFileLengthProvider.html" title="interface in org.apache.hadoop.hbase.replication.regionserver"><code>WALFileLengthProvider</code></a> used for replication, |
| considering the case if we use <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html" title="class in org.apache.hadoop.hbase.regionserver.wal"><code>AsyncFSWAL</code></a>,we write to 3 DNs concurrently, |
| according to the visibility guarantee of HDFS, the data will be available immediately |
| when arriving at DN since all the DNs will be considered as the last one in pipeline.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletableFuture.html?is-external=true" title="class or interface in java.util.concurrent">CompletableFuture</a><<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/regionserver/wal/CombinedAsyncWriter.html#sync-boolean-">sync</a></span>(boolean forceSync)</code> </td> |
| </tr> |
| </table> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <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>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
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| </ul> |
| </li> |
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| </div> |
| <div class="details"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <a name="LOG"> |
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| <h4>LOG</h4> |
| <pre>private static final org.slf4j.Logger <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.39">LOG</a></pre> |
| </li> |
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| <a name="writers"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>writers</h4> |
| <pre>private final org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList<<a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a>> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.41">writers</a></pre> |
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| <h3>Constructor Detail</h3> |
| <a name="CombinedAsyncWriter-org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList-"> |
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| </a> |
| <ul class="blockListLast"> |
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| <h4>CombinedAsyncWriter</h4> |
| <pre>private <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.43">CombinedAsyncWriter</a>(org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList<<a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a>> writers)</pre> |
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| <h3>Method Detail</h3> |
| <a name="getLength--"> |
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| <ul class="blockList"> |
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| <h4>getLength</h4> |
| <pre>public long <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.48">getLength</a>()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.WriterBase.html#getLength--">getLength</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.WriterBase.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.WriterBase</a></code></dd> |
| </dl> |
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| <h4>getSyncedLength</h4> |
| <pre>public long <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.53">getSyncedLength</a>()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.WriterBase.html#getSyncedLength--">WALProvider.WriterBase</a></code></span></div> |
| <div class="block">NOTE: We add this method for <a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/WALFileLengthProvider.html" title="interface in org.apache.hadoop.hbase.replication.regionserver"><code>WALFileLengthProvider</code></a> used for replication, |
| considering the case if we use <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html" title="class in org.apache.hadoop.hbase.regionserver.wal"><code>AsyncFSWAL</code></a>,we write to 3 DNs concurrently, |
| according to the visibility guarantee of HDFS, the data will be available immediately |
| when arriving at DN since all the DNs will be considered as the last one in pipeline. |
| This means replication may read uncommitted data and replicate it to the remote cluster |
| and cause data inconsistency. |
| The method <a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.WriterBase.html#getLength--"><code>WALProvider.WriterBase.getLength()</code></a> may return length which just in hdfs client |
| buffer and not successfully synced to HDFS, so we use this method to return the length |
| successfully synced to HDFS and replication thread could only read writing WAL file |
| limited by this length. |
| see also HBASE-14004 and this document for more details: |
| https://docs.google.com/document/d/11AyWtGhItQs6vsLRIx32PwTxmBY3libXwGXI25obVEY/edit#</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.WriterBase.html#getSyncedLength--">getSyncedLength</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.WriterBase.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.WriterBase</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>byteSize successfully synced to underlying filesystem.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="close--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>close</h4> |
| <pre>public void <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.58">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> |
| <dl> |
| <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> in interface <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="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> in interface <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="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> |
| </ul> |
| <a name="append-org.apache.hadoop.hbase.wal.WAL.Entry-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>append</h4> |
| <pre>public void <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.77">append</a>(<a href="../../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> entry)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html#append-org.apache.hadoop.hbase.wal.WAL.Entry-">append</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>sync</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletableFuture.html?is-external=true" title="class or interface in java.util.concurrent">CompletableFuture</a><<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>> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.82">sync</a>(boolean forceSync)</pre> |
| <dl> |
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| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html#sync-boolean-">sync</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a></code></dd> |
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| <pre>public static <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html" title="class in org.apache.hadoop.hbase.regionserver.wal">CombinedAsyncWriter</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.html#line.97">create</a>(<a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a> writer, |
| <a href="../../../../../../org/apache/hadoop/hbase/wal/WALProvider.AsyncWriter.html" title="interface in org.apache.hadoop.hbase.wal">WALProvider.AsyncWriter</a>... writers)</pre> |
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