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| <h2 title="Interface MemStoreLAB" class="title">Interface MemStoreLAB</h2> |
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| <dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/ImmutableMemStoreLAB.html" title="class in org.apache.hadoop.hbase.regionserver">ImmutableMemStoreLAB</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreLABImpl</a></dd> |
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| <pre>@InterfaceAudience.Private |
| public interface <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.47">MemStoreLAB</a></pre> |
| <div class="block">A memstore-local allocation buffer. |
| <p> |
| The MemStoreLAB is basically a bump-the-pointer allocator that allocates big (2MB) chunks from |
| and then doles it out to threads that request slices into the array. These chunks can get pooled |
| as well. See <a href="../../../../../org/apache/hadoop/hbase/regionserver/ChunkCreator.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ChunkCreator</code></a>. |
| <p> |
| The purpose of this is to combat heap fragmentation in the regionserver. By ensuring that all |
| Cells in a given memstore refer only to large chunks of contiguous memory, we ensure that |
| large blocks get freed up when the memstore is flushed. |
| <p> |
| Without the MSLAB, the byte array allocated during insertion end up interleaved throughout the |
| heap, and the old generation gets progressively more fragmented until a stop-the-world compacting |
| collection occurs. |
| <p> |
| This manages the large sized chunks. When Cells are to be added to Memstore, MemStoreLAB's |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#copyCellInto-org.apache.hadoop.hbase.Cell-"><code>copyCellInto(Cell)</code></a> gets called. This allocates enough size in the chunk to hold this |
| cell's data and copies into this area and then recreate a Cell over this copied data. |
| <p></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/ChunkCreator.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ChunkCreator</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <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>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/MemStoreLAB.html#CHUNK_POOL_INITIALSIZE_KEY">CHUNK_POOL_INITIALSIZE_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/regionserver/MemStoreLAB.html#CHUNK_POOL_MAXSIZE_KEY">CHUNK_POOL_MAXSIZE_KEY</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#CHUNK_SIZE_DEFAULT">CHUNK_SIZE_DEFAULT</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/regionserver/MemStoreLAB.html#CHUNK_SIZE_KEY">CHUNK_SIZE_KEY</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#INDEX_CHUNK_SIZE_PERCENTAGE_DEFAULT">INDEX_CHUNK_SIZE_PERCENTAGE_DEFAULT</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/regionserver/MemStoreLAB.html#INDEX_CHUNK_SIZE_PERCENTAGE_KEY">INDEX_CHUNK_SIZE_PERCENTAGE_KEY</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#MAX_ALLOC_DEFAULT">MAX_ALLOC_DEFAULT</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/regionserver/MemStoreLAB.html#MAX_ALLOC_KEY">MAX_ALLOC_KEY</a></span></code> </td> |
| </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/regionserver/MemStoreLAB.html#MSLAB_CLASS_NAME">MSLAB_CLASS_NAME</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#POOL_INITIAL_SIZE_DEFAULT">POOL_INITIAL_SIZE_DEFAULT</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#POOL_MAX_SIZE_DEFAULT">POOL_MAX_SIZE_DEFAULT</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#USEMSLAB_DEFAULT">USEMSLAB_DEFAULT</a></span></code> </td> |
| </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/regionserver/MemStoreLAB.html#USEMSLAB_KEY">USEMSLAB_KEY</a></span></code> </td> |
| </tr> |
| </table> |
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| </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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span><span id="t5" class="tableTab"><span><a href="javascript:show(16);">Default 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>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#close--">close</a></span>()</code> |
| <div class="block">Close instance since it won't be used any more, try to put the chunks back to pool</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#copyCellInto-org.apache.hadoop.hbase.Cell-">copyCellInto</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> cell)</code> |
| <div class="block">Allocates slice in this LAB and copy the passed Cell into this area.</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/regionserver/MemStoreLAB.html#decScannerCount--">decScannerCount</a></span>()</code> |
| <div class="block">Called when closing a scanner on the data of this MemStoreLAB</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#forceCopyOfBigCellInto-org.apache.hadoop.hbase.Cell-">forceCopyOfBigCellInto</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> cell)</code> |
| <div class="block">Allocates slice in this LAB and copy the passed Cell into this area.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/Chunk.html" title="class in org.apache.hadoop.hbase.regionserver">Chunk</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#getNewExternalChunk-org.apache.hadoop.hbase.regionserver.ChunkCreator.ChunkType-">getNewExternalChunk</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/ChunkCreator.ChunkType.html" title="enum in org.apache.hadoop.hbase.regionserver">ChunkCreator.ChunkType</a> chunkType)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/Chunk.html" title="class in org.apache.hadoop.hbase.regionserver">Chunk</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#getNewExternalChunk-int-">getNewExternalChunk</a></span>(int size)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#incScannerCount--">incScannerCount</a></span>()</code> |
| <div class="block">Called when opening a scanner on the data of this MemStoreLAB</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#isEnabled-org.apache.hadoop.conf.Configuration-">isEnabled</a></span>(org.apache.hadoop.conf.Configuration conf)</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#isOffHeap--">isOffHeap</a></span>()</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#isOnHeap--">isOnHeap</a></span>()</code> </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html" title="interface in org.apache.hadoop.hbase.regionserver">MemStoreLAB</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#newInstance-org.apache.hadoop.conf.Configuration-">newInstance</a></span>(org.apache.hadoop.conf.Configuration conf)</code> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
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| <li class="blockList"><a name="field.detail"> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="USEMSLAB_KEY"> |
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| <h4>USEMSLAB_KEY</h4> |
| <pre>static final <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> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.49">USEMSLAB_KEY</a></pre> |
| <dl> |
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| </dl> |
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| <pre>static final boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.50">USEMSLAB_DEFAULT</a></pre> |
| <dl> |
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| </dl> |
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| <a name="MSLAB_CLASS_NAME"> |
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| <h4>MSLAB_CLASS_NAME</h4> |
| <pre>static final <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> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.51">MSLAB_CLASS_NAME</a></pre> |
| <dl> |
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| <pre>static final <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> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.53">CHUNK_SIZE_KEY</a></pre> |
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| <pre>static final int <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.54">CHUNK_SIZE_DEFAULT</a></pre> |
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| <pre>static final float <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.56">INDEX_CHUNK_SIZE_PERCENTAGE_DEFAULT</a></pre> |
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| <pre><a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.71">copyCellInto</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> cell)</pre> |
| <div class="block">Allocates slice in this LAB and copy the passed Cell into this area. Returns new Cell instance |
| over the copied the data. When this MemStoreLAB can not copy this Cell, it returns null.</div> |
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| <div class="block">Allocates slice in this LAB and copy the passed Cell into this area. Returns new Cell instance |
| over the copied the data. When this MemStoreLAB can not copy this Cell, it returns null. |
| |
| Since the process of flattening to CellChunkMap assumes all cells are allocated on MSLAB, |
| and since copyCellInto does not copy big cells (for whom size > maxAlloc) into MSLAB, |
| this method is called while the process of flattening to CellChunkMap is running, |
| for forcing the allocation of big cells on this MSLAB.</div> |
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| <pre>void <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#line.87">close</a>()</pre> |
| <div class="block">Close instance since it won't be used any more, try to put the chunks back to pool</div> |
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| <div class="block">Called when opening a scanner on the data of this MemStoreLAB</div> |
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| <div class="block">Called when closing a scanner on the data of this MemStoreLAB</div> |
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