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| <h2 title="Class FSDataInputStreamWrapper" class="title">Class FSDataInputStreamWrapper</h2> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#line.42">FSDataInputStreamWrapper</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="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre> |
| <div class="block">Wrapper for input stream(s) that takes care of the interaction of FS and HBase checksums, |
| as well as closing streams. Initialization is not thread-safe, but normal operation is; |
| see method comments.</div> |
| </li> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.ReadStatistics.html" title="class in org.apache.hadoop.hbase.io">FSDataInputStreamWrapper.ReadStatistics</a></span></code> </td> |
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| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#doCloseStreams">doCloseStreams</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#dropBehind">dropBehind</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicInteger</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#hbaseChecksumOffCount">hbaseChecksumOffCount</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/fs/HFileSystem.html" title="class in org.apache.hadoop.hbase.fs">HFileSystem</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#hfs">hfs</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#instanceOfCanUnbuffer">instanceOfCanUnbuffer</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#isLogTraceEnabled">isLogTraceEnabled</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/io/FileLink.html" title="class in org.apache.hadoop.hbase.io">FileLink</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#link">link</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.Path</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#path">path</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#readahead">readahead</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.ReadStatistics.html" title="class in org.apache.hadoop.hbase.io">FSDataInputStreamWrapper.ReadStatistics</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#readStatistics">readStatistics</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.FSDataInputStream</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#stream">stream</a></span></code> |
| <div class="block">Two stream handles, one with and one without FS-level checksum.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.FSDataInputStream</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#streamNoFsChecksum">streamNoFsChecksum</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <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></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#streamNoFsChecksumFirstCreateLock">streamNoFsChecksumFirstCreateLock</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.CanUnbuffer</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#unbuffer">unbuffer</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#useHBaseChecksum">useHBaseChecksum</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#useHBaseChecksumConfigured">useHBaseChecksumConfigured</a></span></code> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.summary"> |
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| </a> |
| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier</th> |
| <th class="colLast" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code> </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#FSDataInputStreamWrapper-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.hbase.io.FileLink-boolean-long-">FSDataInputStreamWrapper</a></span>(org.apache.hadoop.fs.FileSystem fs, |
| <a href="../../../../../org/apache/hadoop/hbase/io/FileLink.html" title="class in org.apache.hadoop.hbase.io">FileLink</a> link, |
| boolean dropBehind, |
| long readahead)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#FSDataInputStreamWrapper-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.hbase.io.FileLink-org.apache.hadoop.fs.Path-boolean-long-">FSDataInputStreamWrapper</a></span>(org.apache.hadoop.fs.FileSystem fs, |
| <a href="../../../../../org/apache/hadoop/hbase/io/FileLink.html" title="class in org.apache.hadoop.hbase.io">FileLink</a> link, |
| org.apache.hadoop.fs.Path path, |
| boolean dropBehind, |
| long readahead)</code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code> </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#FSDataInputStreamWrapper-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-">FSDataInputStreamWrapper</a></span>(org.apache.hadoop.fs.FileSystem fs, |
| org.apache.hadoop.fs.Path path)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code> </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#FSDataInputStreamWrapper-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-boolean-long-">FSDataInputStreamWrapper</a></span>(org.apache.hadoop.fs.FileSystem fs, |
| org.apache.hadoop.fs.Path path, |
| boolean dropBehind, |
| long readahead)</code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code> </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#FSDataInputStreamWrapper-org.apache.hadoop.fs.FSDataInputStream-">FSDataInputStreamWrapper</a></span>(org.apache.hadoop.fs.FSDataInputStream fsdis)</code> |
| <div class="block">For use in tests.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code> </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#FSDataInputStreamWrapper-org.apache.hadoop.fs.FSDataInputStream-org.apache.hadoop.fs.FSDataInputStream-">FSDataInputStreamWrapper</a></span>(org.apache.hadoop.fs.FSDataInputStream fsdis, |
| org.apache.hadoop.fs.FSDataInputStream noChecksum)</code> |
| <div class="block">For use in tests.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <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> |
| <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/io/FSDataInputStreamWrapper.html#checksumOk--">checksumOk</a></span>()</code> |
| <div class="block">Report that checksum was ok, so we may ponder going back to HBase checksum.</div> |
| </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/io/FSDataInputStreamWrapper.html#close--">close</a></span>()</code> |
| <div class="block">CloseClose stream(s) if necessary.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>org.apache.hadoop.fs.FSDataInputStream</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#fallbackToFsChecksum-int-">fallbackToFsChecksum</a></span>(int offCount)</code> |
| <div class="block">Read from non-checksum stream failed, fall back to FS checksum.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/fs/HFileSystem.html" title="class in org.apache.hadoop.hbase.fs">HFileSystem</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#getHfs--">getHfs</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#getLocalBytesRead--">getLocalBytesRead</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#getShortCircuitBytesRead--">getShortCircuitBytesRead</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>org.apache.hadoop.fs.FSDataInputStream</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#getStream-boolean-">getStream</a></span>(boolean useHBaseChecksum)</code> |
| <div class="block">Get the stream to use.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#getTotalBytesRead--">getTotalBytesRead</a></span>()</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#getZeroCopyBytesRead--">getZeroCopyBytesRead</a></span>()</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#prepareForBlockReader-boolean-">prepareForBlockReader</a></span>(boolean forceNoHBaseChecksum)</code> |
| <div class="block">Prepares the streams for block reader.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#setStreamOptions-org.apache.hadoop.fs.FSDataInputStream-">setStreamOptions</a></span>(org.apache.hadoop.fs.FSDataInputStream in)</code> </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#shouldUseHBaseChecksum--">shouldUseHBaseChecksum</a></span>()</code> </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#unbuffer--">unbuffer</a></span>()</code> |
| <div class="block">This will free sockets and file descriptors held by the stream only when the stream implements |
| org.apache.hadoop.fs.CanUnbuffer.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#updateInputStreamStatistics-org.apache.hadoop.fs.FSDataInputStream-">updateInputStreamStatistics</a></span>(org.apache.hadoop.fs.FSDataInputStream stream)</code> </td> |
| </tr> |
| </table> |
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| HDFS checksum setting is on FS level, not single read level, so you have to keep two |
| FS objects and two handles open to interleave different reads freely, which is very sad. |
| This is what we do: |
| 1) First, we need to read the trailer of HFile to determine checksum parameters. |
| We always use FS checksum to do that, so ctor opens <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#stream"><code>stream</code></a>. |
| 2.1) After that, if HBase checksum is not used, we'd just always use <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#stream"><code>stream</code></a>; |
| 2.2) If HBase checksum can be used, we'll open <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#streamNoFsChecksum"><code>streamNoFsChecksum</code></a>, |
| and close <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#stream"><code>stream</code></a>. User MUST call prepareForBlockReader for that to happen; |
| if they don't, (2.1) will be the default. |
| 3) The users can call <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#shouldUseHBaseChecksum--"><code>shouldUseHBaseChecksum()</code></a>, and pass its result to |
| <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#getStream-boolean-"><code>getStream(boolean)</code></a> to get stream (if Java had out/pointer params we could |
| return both in one call). This stream is guaranteed to be set. |
| 4) The first time HBase checksum fails, one would call <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#fallbackToFsChecksum-int-"><code>fallbackToFsChecksum(int)</code></a>. |
| That will take lock, and open <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#stream"><code>stream</code></a>. While this is going on, others will |
| continue to use the old stream; if they also want to fall back, they'll also call |
| <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#fallbackToFsChecksum-int-"><code>fallbackToFsChecksum(int)</code></a>, and block until <a href="../../../../../org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#stream"><code>stream</code></a> is set. |
| 5) After some number of checksumOk() calls, we will go back to using HBase checksum. |
| We will have 2 handles; however we presume checksums fail so rarely that we don't care.</div> |
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| org.apache.hadoop.fs.Path path) |
| 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="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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| org.apache.hadoop.fs.Path path, |
| boolean dropBehind, |
| long readahead) |
| 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="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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| <a href="../../../../../org/apache/hadoop/hbase/io/FileLink.html" title="class in org.apache.hadoop.hbase.io">FileLink</a> link, |
| boolean dropBehind, |
| long readahead) |
| 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="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> |
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| <pre>private <a href="../../../../../src-html/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#line.115">FSDataInputStreamWrapper</a>(org.apache.hadoop.fs.FileSystem fs, |
| <a href="../../../../../org/apache/hadoop/hbase/io/FileLink.html" title="class in org.apache.hadoop.hbase.io">FileLink</a> link, |
| org.apache.hadoop.fs.Path path, |
| boolean dropBehind, |
| long readahead) |
| 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="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> |
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| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#line.173">FSDataInputStreamWrapper</a>(org.apache.hadoop.fs.FSDataInputStream fsdis)</pre> |
| <div class="block">For use in tests.</div> |
| </li> |
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| org.apache.hadoop.fs.FSDataInputStream noChecksum)</pre> |
| <div class="block">For use in tests.</div> |
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| <pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#line.155">prepareForBlockReader</a>(boolean forceNoHBaseChecksum) |
| 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">Prepares the streams for block reader. NOT THREAD SAFE. Must be called once, after any |
| reads finish and before any other reads start (what happens in reality is we read the |
| tail, then call this based on what's in the tail, then read blocks).</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>forceNoHBaseChecksum</code> - Force not using HBase checksum.</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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| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Whether we are presently using HBase checksum.</dd> |
| </dl> |
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| <div class="block">Get the stream to use. Thread-safe.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>useHBaseChecksum</code> - must be the value that shouldUseHBaseChecksum has returned |
| at some point in the past, otherwise the result is undefined.</dd> |
| </dl> |
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| <pre>public org.apache.hadoop.fs.FSDataInputStream <a href="../../../../../src-html/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#line.210">fallbackToFsChecksum</a>(int offCount) |
| 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">Read from non-checksum stream failed, fall back to FS checksum. Thread-safe.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>offCount</code> - For how many checksumOk calls to turn off the HBase checksum.</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>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#line.229">checksumOk</a>()</pre> |
| <div class="block">Report that checksum was ok, so we may ponder going back to HBase checksum.</div> |
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| <pre>private void <a href="../../../../../src-html/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.html#line.238">updateInputStreamStatistics</a>(org.apache.hadoop.fs.FSDataInputStream stream)</pre> |
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| <div class="block">CloseClose stream(s) if necessary.</div> |
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| <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> |
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| <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> |
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| <div class="block">This will free sockets and file descriptors held by the stream only when the stream implements |
| org.apache.hadoop.fs.CanUnbuffer. NOT THREAD SAFE. Must be called only when all the clients |
| using this stream to read the blocks have finished reading. If by chance the stream is |
| unbuffered and there are clients still holding this stream for read then on next client read |
| request a new socket will be opened by Datanode without client knowing about it and will serve |
| its read request. Note: If this socket is idle for some time then the DataNode will close the |
| socket and the socket will move into CLOSE_WAIT state and on the next client request on this |
| stream, the current socket will be closed and a new socket will be opened to serve the |
| requests.</div> |
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