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| <h2 title="Class SharedMemoryMmapIOEngine" class="title">Class SharedMemoryMmapIOEngine</h2> |
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| <li><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/PersistentIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">org.apache.hadoop.hbase.io.hfile.bucket.PersistentIOEngine</a></li> |
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| <li><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">org.apache.hadoop.hbase.io.hfile.bucket.FileMmapIOEngine</a></li> |
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| <li>org.apache.hadoop.hbase.io.hfile.bucket.SharedMemoryMmapIOEngine</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/IOEngine.html" title="interface in org.apache.hadoop.hbase.io.hfile.bucket">IOEngine</a></dd> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/SharedMemoryMmapIOEngine.html#line.37">SharedMemoryMmapIOEngine</a> |
| extends <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">FileMmapIOEngine</a></pre> |
| <div class="block">IO engine that stores data in pmem devices such as DCPMM. This engine also mmaps the file from |
| the given path. But note that this path has to be a path on the pmem device so that when mmapped |
| the file's address is mapped to the Pmem's address space and not in the DRAM. Since this address |
| space is exclusive for the Pmem device there is no swapping out of the mmapped contents that |
| generally happens when DRAM's free space is not enough to hold the specified file's mmapped |
| contents. This gives us the option of using the <code>MemoryType#SHARED</code> type when serving the |
| data from this pmem address space. We need not copy the blocks to the onheap space as we need to |
| do for the case of <code>ExclusiveMemoryMmapIOEngine</code>.</div> |
| </li> |
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| <code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#bufferArray">bufferArray</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#LOG">LOG</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#path">path</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#size">size</a></code></li> |
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| <h3>Fields inherited from class org.apache.hadoop.hbase.io.hfile.bucket.<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/PersistentIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">PersistentIOEngine</a></h3> |
| <code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/PersistentIOEngine.html#filePaths">filePaths</a></code></li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/SharedMemoryMmapIOEngine.html#SharedMemoryMmapIOEngine-java.lang.String-long-">SharedMemoryMmapIOEngine</a></span>(<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> filePath, |
| long capacity)</code> </td> |
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| <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="../../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/SharedMemoryMmapIOEngine.html#read-org.apache.hadoop.hbase.io.hfile.bucket.BucketEntry-">read</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketEntry</a> be)</code> |
| <div class="block">Transfers data from IOEngine to a Cacheable object.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/SharedMemoryMmapIOEngine.html#usesSharedMemory--">usesSharedMemory</a></span>()</code> |
| <div class="block">IOEngine uses shared memory means, when reading Cacheable from it, those refers to the same |
| memory area as used by the Engine for caching it.</div> |
| </td> |
| </tr> |
| </table> |
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| <h3>Methods inherited from class org.apache.hadoop.hbase.io.hfile.bucket.<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">FileMmapIOEngine</a></h3> |
| <code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#isPersistent--">isPersistent</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#shutdown--">shutdown</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#sync--">sync</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#toString--">toString</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#write-java.nio.ByteBuffer-long-">write</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#write-org.apache.hadoop.hbase.nio.ByteBuff-long-">write</a></code></li> |
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| <h3>Methods inherited from class org.apache.hadoop.hbase.io.hfile.bucket.<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/PersistentIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">PersistentIOEngine</a></h3> |
| <code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/PersistentIOEngine.html#calculateChecksum-java.lang.String-">calculateChecksum</a>, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/PersistentIOEngine.html#verifyFileIntegrity-byte:A-java.lang.String-">verifyFileIntegrity</a></code></li> |
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| <h4>SharedMemoryMmapIOEngine</h4> |
| <pre>public <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/SharedMemoryMmapIOEngine.html#line.41">SharedMemoryMmapIOEngine</a>(<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> filePath, |
| long capacity) |
| 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> |
| <dl> |
| <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> |
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| <a name="usesSharedMemory--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>usesSharedMemory</h4> |
| <pre>public boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/SharedMemoryMmapIOEngine.html#line.46">usesSharedMemory</a>()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/IOEngine.html#usesSharedMemory--">IOEngine</a></code></span></div> |
| <div class="block">IOEngine uses shared memory means, when reading Cacheable from it, those refers to the same |
| memory area as used by the Engine for caching it.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true when IOEngine using shared memory.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="read-org.apache.hadoop.hbase.io.hfile.bucket.BucketEntry-"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>read</h4> |
| <pre>public <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a> <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/SharedMemoryMmapIOEngine.html#line.51">read</a>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketEntry</a> be) |
| 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/io/hfile/bucket/IOEngine.html#read-org.apache.hadoop.hbase.io.hfile.bucket.BucketEntry-">IOEngine</a></code></span></div> |
| <div class="block">Transfers data from IOEngine to a Cacheable object.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/IOEngine.html#read-org.apache.hadoop.hbase.io.hfile.bucket.BucketEntry-">read</a></code> in interface <code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/IOEngine.html" title="interface in org.apache.hadoop.hbase.io.hfile.bucket">IOEngine</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html#read-org.apache.hadoop.hbase.io.hfile.bucket.BucketEntry-">read</a></code> in class <code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/FileMmapIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">FileMmapIOEngine</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>be</code> - maintains an (offset,len,refCnt) inside.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Cacheable which will wrap the NIO ByteBuffers from IOEngine.</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> - when any IO error happen</dd> |
| </dl> |
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