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| <div class="subTitle">org.apache.hadoop.hbase.coprocessor.example</div> |
| <h2 title="Class ValueRewritingObserver" class="title">Class ValueRewritingObserver</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
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| <li>org.apache.hadoop.hbase.coprocessor.example.ValueRewritingObserver</li> |
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| <div class="description"> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html" title="interface in org.apache.hadoop.hbase">Coprocessor</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionCoprocessor</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a></dd> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#line.45">ValueRewritingObserver</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/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionCoprocessor</a></pre> |
| <div class="block">This RegionObserver replaces the values of Puts from one value to another on compaction.</div> |
| </li> |
| </ul> |
| </div> |
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| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <li class="blockList"><a name="nested.classes.inherited.from.class.org.apache.hadoop.hbase.coprocessor.RegionObserver"> |
| <!-- --> |
| </a> |
| <h3>Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.coprocessor.<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a></h3> |
| <code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.MutationType.html" title="enum in org.apache.hadoop.hbase.coprocessor">RegionObserver.MutationType</a></code></li> |
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| <h3>Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.<a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html" title="interface in org.apache.hadoop.hbase">Coprocessor</a></h3> |
| <code><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.State.html" title="enum in org.apache.hadoop.hbase">Coprocessor.State</a></code></li> |
| </ul> |
| </li> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
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| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/CellBuilder.html" title="interface in org.apache.hadoop.hbase">CellBuilder</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#cellBuilder">cellBuilder</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/util/Bytes.ByteArrayComparator.html" title="class in org.apache.hadoop.hbase.util">Bytes.ByteArrayComparator</a></code></td> |
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| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>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/coprocessor/example/ValueRewritingObserver.html#ORIGINAL_VALUE_KEY">ORIGINAL_VALUE_KEY</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>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/coprocessor/example/ValueRewritingObserver.html#REPLACED_VALUE_KEY">REPLACED_VALUE_KEY</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private byte[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#replacedValue">replacedValue</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private byte[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#sourceValue">sourceValue</a></span></code> </td> |
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| <h3>Fields inherited from interface org.apache.hadoop.hbase.<a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html" title="interface in org.apache.hadoop.hbase">Coprocessor</a></h3> |
| <code><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#PRIORITY_HIGHEST">PRIORITY_HIGHEST</a>, <a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#PRIORITY_LOWEST">PRIORITY_LOWEST</a>, <a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#PRIORITY_SYSTEM">PRIORITY_SYSTEM</a>, <a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#PRIORITY_USER">PRIORITY_USER</a>, <a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#VERSION">VERSION</a></code></li> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#ValueRewritingObserver--">ValueRewritingObserver</a></span>()</code> </td> |
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| <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="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> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#getRegionObserver--">getRegionObserver</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#preCompact-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.Store-org.apache.hadoop.hbase.regionserver.InternalScanner-org.apache.hadoop.hbase.regionserver.ScanType-org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker-org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest-">preCompact</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ObserverContext.html" title="interface in org.apache.hadoop.hbase.coprocessor">ObserverContext</a><<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionCoprocessorEnvironment</a>> c, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/Store.html" title="interface in org.apache.hadoop.hbase.regionserver">Store</a> store, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a> scanner, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/ScanType.html" title="enum in org.apache.hadoop.hbase.regionserver">ScanType</a> scanType, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/compactions/CompactionLifeCycleTracker.html" title="interface in org.apache.hadoop.hbase.regionserver.compactions">CompactionLifeCycleTracker</a> tracker, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/compactions/CompactionRequest.html" title="interface in org.apache.hadoop.hbase.regionserver.compactions">CompactionRequest</a> request)</code> |
| <div class="block">Called prior to writing the <a href="../../../../../../org/apache/hadoop/hbase/regionserver/StoreFile.html" title="interface in org.apache.hadoop.hbase.regionserver"><code>StoreFile</code></a>s selected for compaction into a new |
| <code>StoreFile</code>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#start-org.apache.hadoop.hbase.CoprocessorEnvironment-">start</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase">CoprocessorEnvironment</a> env)</code> |
| <div class="block">Called by the <a href="../../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase"><code>CoprocessorEnvironment</code></a> during it's own startup to initialize the |
| coprocessor.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <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> |
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| <li class="blockList"><a name="methods.inherited.from.class.org.apache.hadoop.hbase.coprocessor.RegionObserver"> |
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| <h3>Methods inherited from interface org.apache.hadoop.hbase.coprocessor.<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a></h3> |
| <code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#postAppend-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.client.Append-org.apache.hadoop.hbase.client.Result-">postAppend</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#postAppend-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.client.Append-org.apache.hadoop.hbase.client.Result-org.apache.hadoop.hbase.wal.WALEdit-">postAppend</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#postAppendBeforeWAL-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.client.Mutation-java.util.List-">postAppendBeforeWAL</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#postBatchMutate-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.MiniBatchOperationInProgress-">postBatchMutate</a>, 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| <h3>Method Detail</h3> |
| <a name="getRegionObserver--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getRegionObserver</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a>> <a href="../../../../../../src-html/org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#line.58">getRegionObserver</a>()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessor.html#getRegionObserver--">getRegionObserver</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionCoprocessor</a></code></dd> |
| </dl> |
| </li> |
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| <a name="start-org.apache.hadoop.hbase.CoprocessorEnvironment-"> |
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| <h4>start</h4> |
| <pre>public void <a href="../../../../../../src-html/org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#line.64">start</a>(<a href="../../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase">CoprocessorEnvironment</a> env) |
| 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"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#start-org.apache.hadoop.hbase.CoprocessorEnvironment-">Coprocessor</a></code></span></div> |
| <div class="block">Called by the <a href="../../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase"><code>CoprocessorEnvironment</code></a> during it's own startup to initialize the |
| coprocessor.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#start-org.apache.hadoop.hbase.CoprocessorEnvironment-">start</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html" title="interface in org.apache.hadoop.hbase">Coprocessor</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="preCompact-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.Store-org.apache.hadoop.hbase.regionserver.InternalScanner-org.apache.hadoop.hbase.regionserver.ScanType-org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker-org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest-"> |
| <!-- --> |
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| <h4>preCompact</h4> |
| <pre>public <a href="../../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#line.74">preCompact</a>(<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ObserverContext.html" title="interface in org.apache.hadoop.hbase.coprocessor">ObserverContext</a><<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionCoprocessorEnvironment</a>> c, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/Store.html" title="interface in org.apache.hadoop.hbase.regionserver">Store</a> store, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a> scanner, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/ScanType.html" title="enum in org.apache.hadoop.hbase.regionserver">ScanType</a> scanType, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/compactions/CompactionLifeCycleTracker.html" title="interface in org.apache.hadoop.hbase.regionserver.compactions">CompactionLifeCycleTracker</a> tracker, |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/compactions/CompactionRequest.html" title="interface in org.apache.hadoop.hbase.regionserver.compactions">CompactionRequest</a> request)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#preCompact-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.Store-org.apache.hadoop.hbase.regionserver.InternalScanner-org.apache.hadoop.hbase.regionserver.ScanType-org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker-org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest-">RegionObserver</a></code></span></div> |
| <div class="block">Called prior to writing the <a href="../../../../../../org/apache/hadoop/hbase/regionserver/StoreFile.html" title="interface in org.apache.hadoop.hbase.regionserver"><code>StoreFile</code></a>s selected for compaction into a new |
| <code>StoreFile</code>. |
| <p> |
| To override or modify the compaction process, implementing classes can wrap the provided |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver"><code>InternalScanner</code></a> with a custom implementation that is returned from this method. The |
| custom scanner can then inspect <a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase"><code>Cell</code></a>s from the wrapped scanner, |
| applying its own policy to what gets written.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#preCompact-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.Store-org.apache.hadoop.hbase.regionserver.InternalScanner-org.apache.hadoop.hbase.regionserver.ScanType-org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker-org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest-">preCompact</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>c</code> - the environment provided by the region server</dd> |
| <dd><code>store</code> - the store being compacted</dd> |
| <dd><code>scanner</code> - the scanner over existing data used in the store file rewriting</dd> |
| <dd><code>scanType</code> - type of Scan</dd> |
| <dd><code>tracker</code> - tracker used to track the life cycle of a compaction</dd> |
| <dd><code>request</code> - the requested compaction</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the scanner to use during compaction. Should not be <code>null</code> unless the |
| implementation is writing new store files on its own.</dd> |
| </dl> |
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