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+<li><a href="#method_summary">Method</a></li>
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+<li>Detail: </li>
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+<div class="subTitle">org.apache.hadoop.hbase.util</div>
+<h2 title="Class FanOutOneBlockAsyncDFSOutput" class="title">Class FanOutOneBlockAsyncDFSOutput</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.hadoop.hbase.util.FanOutOneBlockAsyncDFSOutput</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></dd>
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+<hr>
+<br>
+<pre><a href="../../../../../org/apache/hadoop/hbase/classification/InterfaceAudience.Private.html" title="annotation in org.apache.hadoop.hbase.classification">@InterfaceAudience.Private</a>
+public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#line.99">FanOutOneBlockAsyncDFSOutput</a>
+extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
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+<div class="block">An asynchronous HDFS output stream implementation which fans out data to datanode and only
+ supports writing file with only one block.
+ <p>
+ Use the createOutput method in <a href="../../../../../org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutputHelper.html" title="class in org.apache.hadoop.hbase.util"><code>FanOutOneBlockAsyncDFSOutputHelper</code></a> to create. The mainly
+ usage of this class is implementing WAL, so we only expose a little HDFS configurations in the
+ method. And we place it here under util package because we want to make it independent of WAL
+ implementation thus easier to move it to HDFS project finally.
+ <p>
+ Note that, all connections to datanode will run in the same <code>EventLoop</code> which means we only
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+ <code>EventLoop</code>. And for <a href="../../../../../org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#write(byte[])"><code>write(byte[])</code></a> <a href="../../../../../org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#write(byte[],%20int,%20int)"><code>write(byte[], int, int)</code></a>,
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+ outside <code>EventLoop</code>, there will be an extra context-switch.
+ <p>
+ Advantages compare to DFSOutputStream:
+ <ol>
+ <li>The fan out mechanism. This will reduce the latency.</li>
+ <li>The asynchronous WAL could also run in the same EventLoop, we could just call write and flush
+ inside the EventLoop thread, so generally we only have one thread to do all the things.</li>
+ <li>Fail-fast when connection to datanode error. The WAL implementation could open new writer
+ ASAP.</li>
+ <li>We could benefit from netty's ByteBuf management mechanism.</li>
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+</ul>
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+<th class="colLast" scope="col">Class and Description</th>
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+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.Callback.html" title="class in org.apache.hadoop.hbase.util">FanOutOneBlockAsyncDFSOutput.Callback</a></strong></code> </td>
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+<tr class="rowColor">
+<td class="colFirst"><code>private static class </code></td>
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+<ul class="blockList">
+<li class="blockList"><a name="constructor_detail">
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+</a>
+<h3>Constructor Detail</h3>
+<a name="FanOutOneBlockAsyncDFSOutput(org.apache.hadoop.conf.Configuration, org.apache.hadoop.hbase.util.FSUtils, org.apache.hadoop.hdfs.DistributedFileSystem, org.apache.hadoop.hdfs.DFSClient, org.apache.hadoop.hdfs.protocol.ClientProtocol, java.lang.String, java.lang.String, long, org.apache.hadoop.hdfs.protocol.LocatedBlock, io.netty.channel.EventLoop, java.util.List, org.apache.hadoop.util.DataChecksum, io.netty.buffer.ByteBufAllocator)">
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+<pre><a href="../../../../../src-html/org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#line.312">FanOutOneBlockAsyncDFSOutput</a>(org.apache.hadoop.conf.Configuration conf,
+ <a href="../../../../../org/apache/hadoop/hbase/util/FSUtils.html" title="class in org.apache.hadoop.hbase.util">FSUtils</a> fsUtils,
+ org.apache.hadoop.hdfs.DistributedFileSystem dfs,
+ org.apache.hadoop.hdfs.DFSClient client,
+ org.apache.hadoop.hdfs.protocol.ClientProtocol namenode,
+ <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> clientName,
+ <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> src,
+ long fileId,
+ org.apache.hadoop.hdfs.protocol.LocatedBlock locatedBlock,
+ io.netty.channel.EventLoop eventLoop,
+ <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><io.netty.channel.Channel> datanodeList,
+ org.apache.hadoop.util.DataChecksum summer,
+ io.netty.buffer.ByteBufAllocator alloc)</pre>
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+</ul>
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
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+<h3>Method Detail</h3>
+<a name="completed(io.netty.channel.Channel)">
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+<pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#line.338">write</a>(byte[] b)</pre>
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+<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#write(byte[],%20int,%20int)"><code>write(byte[], int, int)</code></a></dd></dl>
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+<pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#line.346">write</a>(byte[] b,
+ int off,
+ int len)</pre>
+<div class="block">Copy the data into the buffer. Note that you need to call
+ <a href="../../../../../org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#flush(A,%20java.nio.channels.CompletionHandler,%20boolean)"><code>flush(Object, CompletionHandler, boolean)</code></a> to flush the buffer manually.</div>
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+<div class="block">Return the current size of buffered data.</div>
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+ boolean syncBlock)</pre>
+</li>
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+<a name="flush(java.lang.Object,java.nio.channels.CompletionHandler,boolean)">
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+<pre>public <A> void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/FanOutOneBlockAsyncDFSOutput.html#line.452">flush</a>(A attachment,
+ <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/channels/CompletionHandler.html?is-external=true" title="class or interface in java.nio.channels">CompletionHandler</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,? super A> handler,
+ boolean syncBlock)</pre>
+<div class="block">Flush the buffer out to datanodes.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>attachment</code> - will be passed to handler when completed.</dd><dd><code>handler</code> - will set the acked length as result when completed.</dd><dd><code>syncBlock</code> - will call hsync if true, otherwise hflush.</dd></dl>
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+ long size)</pre>
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+<div class="block">The close method when error occurred. Now we just call recoverFileLease.</div>
+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
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+<div class="block">End the current block and complete file at namenode. You should call
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+<dt><strong>Specified by:</strong></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/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="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
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