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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.hadoop.hbase.io.hfile</a></div> |
| <h1 title="Class PreviousBlockCompressionRatePredicator" class="title">Class PreviousBlockCompressionRatePredicator</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.hadoop.hbase.io.hfile.PreviousBlockCompressionRatePredicator</div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="BlockCompressedSizePredicator.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCompressedSizePredicator</a></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="annotations">@Private |
| </span><span class="modifiers">public class </span><span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/PreviousBlockCompressionRatePredicator.html#line-29">PreviousBlockCompressionRatePredicator</a></span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a> |
| implements <a href="BlockCompressedSizePredicator.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCompressedSizePredicator</a></span></div> |
| <div class="block">This BlockCompressedSizePredicator implementation adjusts the block size limit based on the |
| compression rate of the block contents read so far. For the first block, adjusted size would be |
| zero, so it performs a compression of current block contents and calculate compression rate and |
| adjusted size. For subsequent blocks, decision whether the block should be finished or not will |
| be based on the compression rate calculated for the previous block.</div> |
| </section> |
| <section class="summary"> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <h2>Field Summary</h2> |
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| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Field</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>private int</code></div> |
| <div class="col-second even-row-color"><code><a href="#adjustedBlockSize" class="member-name-link">adjustedBlockSize</a></code></div> |
| <div class="col-last even-row-color"> </div> |
| <div class="col-first odd-row-color"><code>private int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#compressionRatio" class="member-name-link">compressionRatio</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| <div class="col-first even-row-color"><code>private int</code></div> |
| <div class="col-second even-row-color"><code><a href="#configuredMaxBlockSize" class="member-name-link">configuredMaxBlockSize</a></code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="fields-inherited-from-class-org.apache.hadoop.hbase.io.hfile.BlockCompressedSizePredicator">Fields inherited from interface org.apache.hadoop.hbase.io.hfile.<a href="BlockCompressedSizePredicator.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCompressedSizePredicator</a></h3> |
| <code><a href="BlockCompressedSizePredicator.html#BLOCK_COMPRESSED_SIZE_PREDICATOR">BLOCK_COMPRESSED_SIZE_PREDICATOR</a>, <a href="BlockCompressedSizePredicator.html#MAX_BLOCK_SIZE_UNCOMPRESSED">MAX_BLOCK_SIZE_UNCOMPRESSED</a></code></div> |
| </section> |
| </li> |
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| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">PreviousBlockCompressionRatePredicator</a>()</code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| </section> |
| </li> |
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| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
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| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#shouldFinishBlock(int)" class="member-name-link">shouldFinishBlock</a><wbr>(int uncompressed)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Returns <b>true</b> if the passed uncompressed size is larger than the limit calculated by |
| <code>updateLatestBlockSizes</code>.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#updateLatestBlockSizes(org.apache.hadoop.hbase.io.hfile.HFileContext,int,int)" class="member-name-link">updateLatestBlockSizes</a><wbr>(<a href="HFileContext.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContext</a> context, |
| int uncompressed, |
| int compressed)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Recalculates compression rate for the last block and adjusts the block size limit as: |
| BLOCK_SIZE * (uncompressed/compressed).</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
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| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <li> |
| <section class="field-details" id="field-detail"> |
| <h2>Field Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="adjustedBlockSize"> |
| <h3>adjustedBlockSize</h3> |
| <div class="member-signature"><span class="modifiers">private</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/PreviousBlockCompressionRatePredicator.html#line-32">adjustedBlockSize</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="compressionRatio"> |
| <h3>compressionRatio</h3> |
| <div class="member-signature"><span class="modifiers">private</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/PreviousBlockCompressionRatePredicator.html#line-33">compressionRatio</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="configuredMaxBlockSize"> |
| <h3>configuredMaxBlockSize</h3> |
| <div class="member-signature"><span class="modifiers">private</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/PreviousBlockCompressionRatePredicator.html#line-34">configuredMaxBlockSize</a></span></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>PreviousBlockCompressionRatePredicator</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/PreviousBlockCompressionRatePredicator.html#line-30">PreviousBlockCompressionRatePredicator</a></span>()</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="updateLatestBlockSizes(org.apache.hadoop.hbase.io.hfile.HFileContext,int,int)"> |
| <h3>updateLatestBlockSizes</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">void</span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/PreviousBlockCompressionRatePredicator.html#line-43">updateLatestBlockSizes</a></span><wbr><span class="parameters">(<a href="HFileContext.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContext</a> context, |
| int uncompressed, |
| int compressed)</span></div> |
| <div class="block">Recalculates compression rate for the last block and adjusts the block size limit as: |
| BLOCK_SIZE * (uncompressed/compressed).</div> |
| <dl class="notes"> |
| <dt>Specified by:</dt> |
| <dd><code><a href="BlockCompressedSizePredicator.html#updateLatestBlockSizes(org.apache.hadoop.hbase.io.hfile.HFileContext,int,int)">updateLatestBlockSizes</a></code> in interface <code><a href="BlockCompressedSizePredicator.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCompressedSizePredicator</a></code></dd> |
| <dt>Parameters:</dt> |
| <dd><code>context</code> - HFIleContext containing the configured max block size.</dd> |
| <dd><code>uncompressed</code> - the uncompressed size of last block written.</dd> |
| <dd><code>compressed</code> - the compressed size of last block written.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="shouldFinishBlock(int)"> |
| <h3>shouldFinishBlock</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/PreviousBlockCompressionRatePredicator.html#line-55">shouldFinishBlock</a></span><wbr><span class="parameters">(int uncompressed)</span></div> |
| <div class="block">Returns <b>true</b> if the passed uncompressed size is larger than the limit calculated by |
| <code>updateLatestBlockSizes</code>.</div> |
| <dl class="notes"> |
| <dt>Specified by:</dt> |
| <dd><code><a href="BlockCompressedSizePredicator.html#shouldFinishBlock(int)">shouldFinishBlock</a></code> in interface <code><a href="BlockCompressedSizePredicator.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCompressedSizePredicator</a></code></dd> |
| <dt>Parameters:</dt> |
| <dd><code>uncompressed</code> - true if the block should be finished.</dd> |
| </dl> |
| </section> |
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