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| <div class="subTitle">org.apache.hadoop.hbase.regionserver</div> |
| <h2 title="Class InputStreamBlockDistribution" class="title">Class InputStreamBlockDistribution</h2> |
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| <li>org.apache.hadoop.hbase.regionserver.InputStreamBlockDistribution</li> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#line.51">InputStreamBlockDistribution</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></pre> |
| <div class="block">Computes the HDFSBlockDistribution for a file based on the underlying located blocks for an |
| HdfsDataInputStream reading that file. The backing DFSInputStream.getAllBlocks involves |
| allocating an array of numBlocks size per call. It may also involve calling the namenode, if the |
| DFSInputStream has not fetched all the blocks yet. In order to avoid allocation pressure, we |
| cache the computed distribution for a configurable period of time. |
| <p> |
| This class only gets instantiated for the <b>first</b> FSDataInputStream of each StoreFile (i.e. |
| the one backing <a href="../../../../../org/apache/hadoop/hbase/regionserver/HStoreFile.html#initialReader"><code>HStoreFile.initialReader</code></a>). It's then used to dynamically update the value |
| returned by <a href="../../../../../org/apache/hadoop/hbase/regionserver/HStoreFile.html#getHDFSBlockDistribution--"><code>HStoreFile.getHDFSBlockDistribution()</code></a>. |
| <p> |
| Once the backing FSDataInputStream is closed, we should not expect the distribution result to |
| change anymore. This is ok becuase the initialReader's InputStream is only closed when the |
| StoreFile itself is closed, at which point nothing will be querying getHDFSBlockDistribution |
| anymore. If/When the StoreFile is reopened, a new <a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html" title="class in org.apache.hadoop.hbase.regionserver"><code>InputStreamBlockDistribution</code></a> will be |
| created for the new initialReader.</div> |
| </li> |
| </ul> |
| </div> |
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| <ul class="blockList"> |
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| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#cachePeriodMs">cachePeriodMs</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#DEFAULT_HBASE_LOCALITY_INPUTSTREAM_DERIVE_CACHE_PERIOD">DEFAULT_HBASE_LOCALITY_INPUTSTREAM_DERIVE_CACHE_PERIOD</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#DEFAULT_HBASE_LOCALITY_INPUTSTREAM_DERIVE_ENABLED">DEFAULT_HBASE_LOCALITY_INPUTSTREAM_DERIVE_ENABLED</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileInfo.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileInfo</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#fileInfo">fileInfo</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static <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/regionserver/InputStreamBlockDistribution.html#HBASE_LOCALITY_INPUTSTREAM_DERIVE_CACHE_PERIOD">HBASE_LOCALITY_INPUTSTREAM_DERIVE_CACHE_PERIOD</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static <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/regionserver/InputStreamBlockDistribution.html#HBASE_LOCALITY_INPUTSTREAM_DERIVE_ENABLED">HBASE_LOCALITY_INPUTSTREAM_DERIVE_ENABLED</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/HDFSBlocksDistribution.html" title="class in org.apache.hadoop.hbase">HDFSBlocksDistribution</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#hdfsBlocksDistribution">hdfsBlocksDistribution</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/regionserver/InputStreamBlockDistribution.html#lastCachedAt">lastCachedAt</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <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/InputStreamBlockDistribution.html#LOG">LOG</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/regionserver/InputStreamBlockDistribution.html#stream">stream</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/regionserver/InputStreamBlockDistribution.html#streamUnsupported">streamUnsupported</a></span></code> </td> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#InputStreamBlockDistribution-org.apache.hadoop.fs.FSDataInputStream-org.apache.hadoop.hbase.regionserver.StoreFileInfo-">InputStreamBlockDistribution</a></span>(org.apache.hadoop.fs.FSDataInputStream stream, |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileInfo.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileInfo</a> fileInfo)</code> |
| <div class="block">This should only be called for the first FSDataInputStream of a StoreFile, in |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/HStoreFile.html#open--"><code>HStoreFile.open()</code></a>.</div> |
| </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#computeBlockDistribution--">computeBlockDistribution</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#getCachePeriodMs--">getCachePeriodMs</a></span>()</code> |
| <div class="block">For tests only, returns the configured cache period</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/HDFSBlocksDistribution.html" title="class in org.apache.hadoop.hbase">HDFSBlocksDistribution</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#getHDFSBlockDistribution--">getHDFSBlockDistribution</a></span>()</code> |
| <div class="block">Get the HDFSBlocksDistribution derived from the StoreFile input stream, re-computing if cache |
| is expired.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#isEnabled-org.apache.hadoop.conf.Configuration-">isEnabled</a></span>(org.apache.hadoop.conf.Configuration conf)</code> |
| <div class="block">True if we should derive StoreFile HDFSBlockDistribution from the underlying input stream</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#isStreamUnsupported--">isStreamUnsupported</a></span>()</code> |
| <div class="block">For tests only, returns whether the passed stream is supported</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#setLastCachedAt-long-">setLastCachedAt</a></span>(long timestamp)</code> |
| <div class="block">For tests only, sets lastCachedAt so we can force a refresh</div> |
| </td> |
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| </ul> |
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| <pre>private static final org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#line.52">LOG</a></pre> |
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| <h4>InputStreamBlockDistribution</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#line.77">InputStreamBlockDistribution</a>(org.apache.hadoop.fs.FSDataInputStream stream, |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileInfo.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileInfo</a> fileInfo)</pre> |
| <div class="block">This should only be called for the first FSDataInputStream of a StoreFile, in |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/HStoreFile.html#open--"><code>HStoreFile.open()</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>stream</code> - the input stream to derive locality from</dd> |
| <dd><code>fileInfo</code> - the StoreFileInfo for the related store file</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html" title="class in org.apache.hadoop.hbase.regionserver"><code>InputStreamBlockDistribution</code></a></dd> |
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| <pre>public static boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#line.90">isEnabled</a>(org.apache.hadoop.conf.Configuration conf)</pre> |
| <div class="block">True if we should derive StoreFile HDFSBlockDistribution from the underlying input stream</div> |
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| <div class="block">Get the HDFSBlocksDistribution derived from the StoreFile input stream, re-computing if cache |
| is expired.</div> |
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| 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> |
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| <pre>void <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.html#line.142">setLastCachedAt</a>(long timestamp)</pre> |
| <div class="block">For tests only, sets lastCachedAt so we can force a refresh</div> |
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| <div class="block">For tests only, returns the configured cache period</div> |
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| <div class="block">For tests only, returns whether the passed stream is supported</div> |
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