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| <h2 title="Class MemoryManagerImpl" class="title">Class MemoryManagerImpl</h2> |
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| <li>org.apache.orc.impl.MemoryManagerImpl</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../org/apache/orc/MemoryManager.html" title="interface in org.apache.orc">MemoryManager</a></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../org/apache/orc/impl/MemoryManager.html" title="class in org.apache.orc.impl">MemoryManager</a></dd> |
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| <pre>public class <span class="typeNameLabel">MemoryManagerImpl</span> |
| extends <a href="http://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/orc/MemoryManager.html" title="interface in org.apache.orc">MemoryManager</a></pre> |
| <div class="block">Implements a memory manager that keeps a global context of how many ORC |
| writers there are and manages the memory between them. For use cases with |
| dynamic partitions, it is easy to end up with many writers in the same task. |
| By managing the size of each allocation, we try to cut down the size of each |
| allocation and keep the task from running out of memory. |
| |
| This class is not thread safe, but is re-entrant - ensure creation and all |
| invocations are triggered from the same thread.</div> |
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| <h3>Nested classes/interfaces inherited from interface org.apache.orc.<a href="../../../../org/apache/orc/MemoryManager.html" title="interface in org.apache.orc">MemoryManager</a></h3> |
| <code><a href="../../../../org/apache/orc/MemoryManager.Callback.html" title="interface in org.apache.orc">MemoryManager.Callback</a></code></li> |
| </ul> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/MemoryManagerImpl.html#MemoryManagerImpl-org.apache.hadoop.conf.Configuration-">MemoryManagerImpl</a></span>(<a href="http://hadoop.apache.org/docs/r2.7.3/api/org/apache/hadoop/conf/Configuration.html?is-external=true" title="class or interface in org.apache.hadoop.conf">Configuration</a> conf)</code> |
| <div class="block">Create the memory manager.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/MemoryManagerImpl.html#MemoryManagerImpl-long-">MemoryManagerImpl</a></span>(long poolSize)</code> |
| <div class="block">Create the memory manager</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
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| <h3>Method Summary</h3> |
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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/orc/impl/MemoryManagerImpl.html#addedRow-int-">addedRow</a></span>(int rows)</code> |
| <div class="block">Give the memory manager an opportunity for doing a memory check.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/MemoryManagerImpl.html#addWriter-org.apache.hadoop.fs.Path-long-org.apache.orc.MemoryManager.Callback-">addWriter</a></span>(<a href="http://hadoop.apache.org/docs/r2.7.3/api/org/apache/hadoop/fs/Path.html?is-external=true" title="class or interface in org.apache.hadoop.fs">Path</a> path, |
| long requestedAllocation, |
| <a href="../../../../org/apache/orc/MemoryManager.Callback.html" title="interface in org.apache.orc">MemoryManager.Callback</a> callback)</code> |
| <div class="block">Add a new writer's memory allocation to the pool.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/MemoryManagerImpl.html#checkMemory-long-org.apache.orc.MemoryManager.Callback-">checkMemory</a></span>(long previous, |
| <a href="../../../../org/apache/orc/MemoryManager.Callback.html" title="interface in org.apache.orc">MemoryManager.Callback</a> writer)</code> |
| <div class="block">As part of adding rows, the writer calls this method to determine |
| if the scale factor has changed.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/MemoryManagerImpl.html#getAllocationScale--">getAllocationScale</a></span>()</code> |
| <div class="block">The scaling factor for each allocation to ensure that the pool isn't |
| oversubscribed.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/MemoryManagerImpl.html#getTotalMemoryPool--">getTotalMemoryPool</a></span>()</code> |
| <div class="block">Get the total pool size that is available for ORC writers.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/MemoryManagerImpl.html#notifyWriters--">notifyWriters</a></span>()</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="block"><span class="deprecationComment">remove this method</span></div> |
| </div> |
| </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/orc/impl/MemoryManagerImpl.html#removeWriter-org.apache.hadoop.fs.Path-">removeWriter</a></span>(<a href="http://hadoop.apache.org/docs/r2.7.3/api/org/apache/hadoop/fs/Path.html?is-external=true" title="class or interface in org.apache.hadoop.fs">Path</a> path)</code> |
| <div class="block">Remove the given writer from the pool.</div> |
| </td> |
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| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <h3>Constructor Detail</h3> |
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| </a> |
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| <h4>MemoryManagerImpl</h4> |
| <pre>public MemoryManagerImpl(<a href="http://hadoop.apache.org/docs/r2.7.3/api/org/apache/hadoop/conf/Configuration.html?is-external=true" title="class or interface in org.apache.hadoop.conf">Configuration</a> conf)</pre> |
| <div class="block">Create the memory manager.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - use the configuration to find the maximum size of the memory |
| pool.</dd> |
| </dl> |
| </li> |
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| <h4>MemoryManagerImpl</h4> |
| <pre>public MemoryManagerImpl(long poolSize)</pre> |
| <div class="block">Create the memory manager</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>poolSize</code> - the size of memory to use</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h3>Method Detail</h3> |
| <a name="addWriter-org.apache.hadoop.fs.Path-long-org.apache.orc.MemoryManager.Callback-"> |
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| <h4>addWriter</h4> |
| <pre>public void addWriter(<a href="http://hadoop.apache.org/docs/r2.7.3/api/org/apache/hadoop/fs/Path.html?is-external=true" title="class or interface in org.apache.hadoop.fs">Path</a> path, |
| long requestedAllocation, |
| <a href="../../../../org/apache/orc/MemoryManager.Callback.html" title="interface in org.apache.orc">MemoryManager.Callback</a> callback) |
| throws <a href="http://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">Add a new writer's memory allocation to the pool. We use the path |
| as a unique key to ensure that we don't get duplicates.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/orc/MemoryManager.html#addWriter-org.apache.hadoop.fs.Path-long-org.apache.orc.MemoryManager.Callback-">addWriter</a></code> in interface <code><a href="../../../../org/apache/orc/MemoryManager.html" title="interface in org.apache.orc">MemoryManager</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - the file that is being written</dd> |
| <dd><code>requestedAllocation</code> - the requested buffer size</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://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="removeWriter-org.apache.hadoop.fs.Path-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>removeWriter</h4> |
| <pre>public void removeWriter(<a href="http://hadoop.apache.org/docs/r2.7.3/api/org/apache/hadoop/fs/Path.html?is-external=true" title="class or interface in org.apache.hadoop.fs">Path</a> path) |
| throws <a href="http://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">Remove the given writer from the pool.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/orc/MemoryManager.html#removeWriter-org.apache.hadoop.fs.Path-">removeWriter</a></code> in interface <code><a href="../../../../org/apache/orc/MemoryManager.html" title="interface in org.apache.orc">MemoryManager</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - the file that has been closed</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://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="getTotalMemoryPool--"> |
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| </a> |
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| <h4>getTotalMemoryPool</h4> |
| <pre>public long getTotalMemoryPool()</pre> |
| <div class="block">Get the total pool size that is available for ORC writers.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of bytes in the pool</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getAllocationScale--"> |
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| <h4>getAllocationScale</h4> |
| <pre>public double getAllocationScale()</pre> |
| <div class="block">The scaling factor for each allocation to ensure that the pool isn't |
| oversubscribed.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a fraction between 0.0 and 1.0 of the requested size that is |
| available for each writer.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>addedRow</h4> |
| <pre>public void addedRow(int rows) |
| throws <a href="http://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/orc/MemoryManager.html#addedRow-int-">MemoryManager</a></code></span></div> |
| <div class="block">Give the memory manager an opportunity for doing a memory check.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/orc/MemoryManager.html#addedRow-int-">addedRow</a></code> in interface <code><a href="../../../../org/apache/orc/MemoryManager.html" title="interface in org.apache.orc">MemoryManager</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>rows</code> - number of rows added</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://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> |
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| </a> |
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| <h4>notifyWriters</h4> |
| <pre>public void notifyWriters() |
| throws <a href="http://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="deprecatedLabel">Deprecated.</span> <span class="deprecationComment">remove this method</span></div> |
| <div class="block">Obsolete method left for Hive, which extends this class.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://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="checkMemory-long-org.apache.orc.MemoryManager.Callback-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>checkMemory</h4> |
| <pre>public long checkMemory(long previous, |
| <a href="../../../../org/apache/orc/MemoryManager.Callback.html" title="interface in org.apache.orc">MemoryManager.Callback</a> writer) |
| throws <a href="http://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/orc/MemoryManager.html#checkMemory-long-org.apache.orc.MemoryManager.Callback-">MemoryManager</a></code></span></div> |
| <div class="block">As part of adding rows, the writer calls this method to determine |
| if the scale factor has changed. If it has changed, the Callback will be |
| called.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/orc/MemoryManager.html#checkMemory-long-org.apache.orc.MemoryManager.Callback-">checkMemory</a></code> in interface <code><a href="../../../../org/apache/orc/MemoryManager.html" title="interface in org.apache.orc">MemoryManager</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>previous</code> - the previous allocation</dd> |
| <dd><code>writer</code> - the callback to call back into if we need to</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the current allocation</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://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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