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 <div class="subTitle">org.apache.hadoop.hbase.regionserver</div>
 <h2 title="Class MemStoreLABImpl" class="title">Class MemStoreLABImpl</h2>
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 <ul class="inheritance">
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 <dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html" title="interface in org.apache.hadoop.hbase.regionserver">MemStoreLAB</a></dd>
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 <pre>@InterfaceAudience.Private
 public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html#line.67">MemStoreLABImpl</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/regionserver/MemStoreLAB.html" title="interface in org.apache.hadoop.hbase.regionserver">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) byte[] chunks from and then doles it out to threads that request
  slices into the array.
  <p>
  The purpose of this class 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>
  TODO: we should probably benchmark whether word-aligning the allocations
  would provide a performance improvement - probably would speed up the
  Bytes.toLong/Bytes.toInt calls in KeyValue, but some of those are cached
  anyway.
  The chunks created by this MemStoreLAB can get pooled at <a href="../../../../../org/apache/hadoop/hbase/regionserver/ChunkCreator.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ChunkCreator</code></a>.
  When the Chunk comes from pool, it can be either an on heap or an off heap backed chunk. The chunks,
  which this MemStoreLAB creates on its own (when no chunk available from pool), those will be
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 <caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
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 <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/regionserver/ChunkCreator.html" title="class in org.apache.hadoop.hbase.regionserver">ChunkCreator</a></code></td>
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 <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html#chunks">chunks</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html#closed">closed</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private int</code></td>
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 <td class="colFirst"><code>(package private) static org.slf4j.Logger</code></td>
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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/MemStoreLABImpl.html#maxAlloc">maxAlloc</a></span></code>&nbsp;</td>
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 <h3>Fields inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html" title="interface in org.apache.hadoop.hbase.regionserver">MemStoreLAB</a></h3>
 <code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#CHUNK_POOL_INITIALSIZE_KEY">CHUNK_POOL_INITIALSIZE_KEY</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#CHUNK_POOL_MAXSIZE_KEY">CHUNK_POOL_MAXSIZE_KEY</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#CHUNK_SIZE_DEFAULT">CHUNK_SIZE_DEFAULT</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#CHUNK_SIZE_KEY">CHUNK_SIZE_KEY</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#INDEX_CHUNK_SIZE_PERCENTAGE_DEFAULT">INDEX_CHUNK_SIZE_PERCENTAGE_DEFAULT</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#INDEX_CHUNK_SIZE_PERCENTAGE_KEY">INDEX_CHUNK_SIZE_PERCENTAGE_KEY</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#MAX_ALLOC_DEFAULT">MAX_ALLOC_DEFAULT</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#MAX_ALLOC_KEY">MAX_ALLOC_KEY</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#MSLAB_CLASS_NAME">MSLAB_CLASS_NAME</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#POOL_INITIAL_SIZE_DEFAULT">POOL_INITIAL_SIZE_DEFAULT</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#POOL_MAX_SIZE_DEFAULT">POOL_MAX_SIZE_DEFAULT</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#USEMSLAB_DEFAULT">USEMSLAB_DEFAULT</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLAB.html#USEMSLAB_KEY">USEMSLAB_KEY</a></code></li>
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 <caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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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/MemStoreLABImpl.html#MemStoreLABImpl--">MemStoreLABImpl</a></span>()</code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html#MemStoreLABImpl-org.apache.hadoop.conf.Configuration-">MemStoreLABImpl</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
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 <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">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html#close--">close</a></span>()</code>
 <div class="block">Close this 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>private <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/MemStoreLABImpl.html#copyBBECellInto-org.apache.hadoop.hbase.ByteBufferExtendedCell-int-">copyBBECellInto</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ByteBufferExtendedCell.html" title="class in org.apache.hadoop.hbase">ByteBufferExtendedCell</a>&nbsp;cell,
                int&nbsp;maxAlloc)</code>
 <div class="block">Mostly a duplicate of <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html#copyCellInto-org.apache.hadoop.hbase.Cell-int-"><code>copyCellInto(Cell, int)</code></a>} done for perf sake.</div>
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 <tr id="i2" class="altColor">
 <td class="colFirst"><code>private static <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/MemStoreLABImpl.html#copyBBECToChunkCell-org.apache.hadoop.hbase.ByteBufferExtendedCell-java.nio.ByteBuffer-int-int-">copyBBECToChunkCell</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ByteBufferExtendedCell.html" title="class in org.apache.hadoop.hbase">ByteBufferExtendedCell</a>&nbsp;cell,
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                    int&nbsp;offset,
                    int&nbsp;len)</code>
 <div class="block">Clone the passed cell by copying its data into the passed buf and create a cell with a chunkid
  out of it</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/MemStoreLABImpl.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>&nbsp;cell)</code>
 <div class="block">Allocates slice in this LAB and copy the passed Cell into this area.</div>
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 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>private <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/MemStoreLABImpl.html#copyCellInto-org.apache.hadoop.hbase.Cell-int-">copyCellInto</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell,
             int&nbsp;maxAlloc)</code>&nbsp;</td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>private static <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/MemStoreLABImpl.html#copyToChunkCell-org.apache.hadoop.hbase.Cell-java.nio.ByteBuffer-int-int-">copyToChunkCell</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell,
                <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;buf,
                int&nbsp;offset,
                int&nbsp;len)</code>
 <div class="block">Clone the passed cell by copying its data into the passed buf and create a cell with a chunkid
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 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>private static <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/MemStoreLABImpl.html#createChunkCell-java.nio.ByteBuffer-int-int-int-long-">createChunkCell</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;buf,
                int&nbsp;offset,
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                int&nbsp;tagsLen,
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 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.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="i8" class="altColor">
 <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/MemStoreLABImpl.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>&nbsp;cell)</code>
 <div class="block">When a cell's size is too big (bigger than maxAlloc),
  copyCellInto does not allocate it on MSLAB.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>(package private) <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/MemStoreLABImpl.html#getCurrentChunk--">getCurrentChunk</a></span>()</code>&nbsp;</td>
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 <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>
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 <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/MemStoreLABImpl.html#getNewExternalChunk-int-">getNewExternalChunk</a></span>(int&nbsp;size)</code>&nbsp;</td>
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 <tr id="i12" class="altColor">
 <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html#getNumOfChunksReturnedToPool--">getNumOfChunksReturnedToPool</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>(package private) int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreLABImpl.html#getOpenScannerCount--">getOpenScannerCount</a></span>()</code>&nbsp;</td>
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 <tr id="i14" class="altColor">
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