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| <h2 title="Class MobCell" class="title">Class MobCell</h2> |
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| <li>org.apache.hadoop.hbase.mob.MobCell</li> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/mob/MobCell.html#line.49">MobCell</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="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre> |
| <div class="block">The MobCell will maintain a <a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase"><code>Cell</code></a> and a <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileScanner.html" title="class in org.apache.hadoop.hbase.regionserver"><code>StoreFileScanner</code></a> inside. Now, the mob cell |
| is backend by NIO ByteBuffers which are allocated from ByteBuffAllocator, so we cannot just read |
| the cell and close the MOB file scanner because the MOB file scanner closing will deallocate the |
| NIO ByteBuffers, which resulting memory leak. |
| <p> |
| Actually, the right solution is: <br> |
| 1. Read the normal cell; <br> |
| 2. Parse the value of normal cell and get MOB fileName,offset,length; <br> |
| 3. Open scanner to read the mob value; <br> |
| 4. Construct the response cell whose key is from the normal cell and value is from the mob cell. |
| <br> |
| 5. Ship the response cell to HBase client. <br> |
| 6. Release both normal cell's block and mob cell's block. <br> |
| <p> |
| For mob cell, the block releasing just means closing the the mob scanner, so here we need to keep |
| the <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileScanner.html" title="class in org.apache.hadoop.hbase.regionserver"><code>StoreFileScanner</code></a> inside and close only when we're ensure that the MobCell has been |
| shipped to RPC client.</div> |
| </li> |
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| <tr 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/mob/MobCell.html#cell">cell</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileScanner</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mob/MobCell.html#sfScanner">sfScanner</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mob/MobCell.html#MobCell-org.apache.hadoop.hbase.Cell-">MobCell</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> cell)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mob/MobCell.html#MobCell-org.apache.hadoop.hbase.Cell-org.apache.hadoop.hbase.regionserver.StoreFileScanner-">MobCell</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> cell, |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileScanner</a> sfScanner)</code> </td> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <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/mob/MobCell.html#close--">close</a></span>()</code> </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/mob/MobCell.html#getCell--">getCell</a></span>()</code> </td> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <h3>Field Detail</h3> |
| <a name="cell"> |
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| </a> |
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| <h4>cell</h4> |
| <pre>private final <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/mob/MobCell.html#line.51">cell</a></pre> |
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| </a> |
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| <h4>sfScanner</h4> |
| <pre>private final <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileScanner</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/mob/MobCell.html#line.52">sfScanner</a></pre> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <li class="blockList"><a name="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="MobCell-org.apache.hadoop.hbase.Cell-"> |
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| </a> |
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| <h4>MobCell</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/mob/MobCell.html#line.54">MobCell</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> cell)</pre> |
| </li> |
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| <a name="MobCell-org.apache.hadoop.hbase.Cell-org.apache.hadoop.hbase.regionserver.StoreFileScanner-"> |
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| <h4>MobCell</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/mob/MobCell.html#line.59">MobCell</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> cell, |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileScanner</a> sfScanner)</pre> |
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| <h4>getCell</h4> |
| <pre>public <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/mob/MobCell.html#line.64">getCell</a>()</pre> |
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| <h4>close</h4> |
| <pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/mob/MobCell.html#line.69">close</a>() |
| 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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| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
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