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<div class="subTitle">org.apache.hadoop.hbase.ipc</div>
<h2 title="Class SimpleRpcScheduler" class="title">Class SimpleRpcScheduler</h2>
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<ul class="inheritance">
<li><a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html" title="class in org.apache.hadoop.hbase.ipc">org.apache.hadoop.hbase.ipc.RpcScheduler</a></li>
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<li>org.apache.hadoop.hbase.ipc.SimpleRpcScheduler</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/conf/ConfigurationObserver.html" title="interface in org.apache.hadoop.hbase.conf">ConfigurationObserver</a></dd>
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<hr>
<br>
<pre>@InterfaceAudience.LimitedPrivate(value={"Coprocesssor","Phoenix"})
@InterfaceStability.Evolving
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#line.38">SimpleRpcScheduler</a>
extends <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html" title="class in org.apache.hadoop.hbase.ipc">RpcScheduler</a>
implements <a href="../../../../../org/apache/hadoop/hbase/conf/ConfigurationObserver.html" title="interface in org.apache.hadoop.hbase.conf">ConfigurationObserver</a></pre>
<div class="block">The default scheduler. Configurable. Maintains isolated handler pools for general ('default'),
high-priority ('priority'), and replication ('replication') requests. Default behavior is to
balance the requests across handlers. Add configs to enable balancing by read vs writes, etc.
See below article for explanation of options.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="http://blog.cloudera.com/blog/2014/12/new-in-cdh-5-2-improvements-for-running-multiple-workloads-on-a-single-hbase-cluster/">Overview on Request Queuing</a></dd>
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<h3>Nested classes/interfaces inherited from class&nbsp;org.apache.hadoop.hbase.ipc.<a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html" title="class in org.apache.hadoop.hbase.ipc">RpcScheduler</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.Context.html" title="class in org.apache.hadoop.hbase.ipc">RpcScheduler.Context</a></code></li>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</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>private <a href="../../../../../org/apache/hadoop/hbase/Abortable.html" title="interface in org.apache.hadoop.hbase">Abortable</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#abortable">abortable</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcExecutor.html" title="class in org.apache.hadoop.hbase.ipc">RpcExecutor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#callExecutor">callExecutor</a></span></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>private int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#highPriorityLevel">highPriorityLevel</a></span></code>
<div class="block">What level a high priority call is at.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcExecutor.html" title="class in org.apache.hadoop.hbase.ipc">RpcExecutor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#metaTransitionExecutor">metaTransitionExecutor</a></span></code>
<div class="block">This executor is only for meta transition</div>
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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/ipc/SimpleRpcScheduler.html#port">port</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ipc/PriorityFunction.html" title="interface in org.apache.hadoop.hbase.ipc">PriorityFunction</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#priority">priority</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcExecutor.html" title="class in org.apache.hadoop.hbase.ipc">RpcExecutor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#priorityExecutor">priorityExecutor</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcExecutor.html" title="class in org.apache.hadoop.hbase.ipc">RpcExecutor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#replicationExecutor">replicationExecutor</a></span></code>&nbsp;</td>
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<h3>Fields inherited from class&nbsp;org.apache.hadoop.hbase.ipc.<a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html" title="class in org.apache.hadoop.hbase.ipc">RpcScheduler</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html#IPC_SERVER_MAX_CALLQUEUE_LENGTH">IPC_SERVER_MAX_CALLQUEUE_LENGTH</a>, <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html#IPC_SERVER_PRIORITY_MAX_CALLQUEUE_LENGTH">IPC_SERVER_PRIORITY_MAX_CALLQUEUE_LENGTH</a>, <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html#IPC_SERVER_REPLICATION_MAX_CALLQUEUE_LENGTH">IPC_SERVER_REPLICATION_MAX_CALLQUEUE_LENGTH</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#SimpleRpcScheduler-org.apache.hadoop.conf.Configuration-int-int-int-int-org.apache.hadoop.hbase.ipc.PriorityFunction-org.apache.hadoop.hbase.Abortable-int-">SimpleRpcScheduler</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf,
int&nbsp;handlerCount,
int&nbsp;priorityHandlerCount,
int&nbsp;replicationHandlerCount,
int&nbsp;metaTransitionHandler,
<a href="../../../../../org/apache/hadoop/hbase/ipc/PriorityFunction.html" title="interface in org.apache.hadoop.hbase.ipc">PriorityFunction</a>&nbsp;priority,
<a href="../../../../../org/apache/hadoop/hbase/Abortable.html" title="interface in org.apache.hadoop.hbase">Abortable</a>&nbsp;server,
int&nbsp;highPriorityLevel)</code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#SimpleRpcScheduler-org.apache.hadoop.conf.Configuration-int-int-int-org.apache.hadoop.hbase.ipc.PriorityFunction-int-">SimpleRpcScheduler</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf,
int&nbsp;handlerCount,
int&nbsp;priorityHandlerCount,
int&nbsp;replicationHandlerCount,
<a href="../../../../../org/apache/hadoop/hbase/ipc/PriorityFunction.html" title="interface in org.apache.hadoop.hbase.ipc">PriorityFunction</a>&nbsp;priority,
int&nbsp;highPriorityLevel)</code>&nbsp;</td>
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<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">&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>
<tr id="i0" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#dispatch-org.apache.hadoop.hbase.ipc.CallRunner-">dispatch</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ipc/CallRunner.html" title="class in org.apache.hadoop.hbase.ipc">CallRunner</a>&nbsp;callTask)</code>
<div class="block">Dispatches an RPC request asynchronously.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getActiveGeneralRpcHandlerCount--">getActiveGeneralRpcHandlerCount</a></span>()</code>
<div class="block">Retrieves the number of active general handler.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getActiveMetaPriorityRpcHandlerCount--">getActiveMetaPriorityRpcHandlerCount</a></span>()</code>
<div class="block">Retrieves the number of active meta priority handler.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getActivePriorityRpcHandlerCount--">getActivePriorityRpcHandlerCount</a></span>()</code>
<div class="block">Retrieves the number of active priority handler.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getActiveReadRpcHandlerCount--">getActiveReadRpcHandlerCount</a></span>()</code>
<div class="block">Retrieves the number of active write rpc handler when use RWQueueRpcExecutor.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getActiveReplicationRpcHandlerCount--">getActiveReplicationRpcHandlerCount</a></span>()</code>
<div class="block">Retrieves the number of active replication handler.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getActiveRpcHandlerCount--">getActiveRpcHandlerCount</a></span>()</code>
<div class="block">Retrieves the total number of active handler.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getActiveScanRpcHandlerCount--">getActiveScanRpcHandlerCount</a></span>()</code>
<div class="block">Retrieves the number of active write rpc handler when use RWQueueRpcExecutor.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getActiveWriteRpcHandlerCount--">getActiveWriteRpcHandlerCount</a></span>()</code>
<div class="block">Retrieves the number of active write rpc handler when use RWQueueRpcExecutor.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/ipc/CallQueueInfo.html" title="class in org.apache.hadoop.hbase.ipc">CallQueueInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getCallQueueInfo--">getCallQueueInfo</a></span>()</code>
<div class="block">Get call queue information</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getGeneralQueueLength--">getGeneralQueueLength</a></span>()</code>
<div class="block">Retrieves length of the general queue for metrics.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getMetaPriorityQueueLength--">getMetaPriorityQueueLength</a></span>()</code>
<div class="block">Retrieves length of the meta priority queue for metrics.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getNumGeneralCallsDropped--">getNumGeneralCallsDropped</a></span>()</code>
<div class="block">If CoDel-based RPC executors are used, retrieves the number of Calls that were dropped
from general queue because RPC executor is under high load; returns 0 otherwise.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getNumLifoModeSwitches--">getNumLifoModeSwitches</a></span>()</code>
<div class="block">If CoDel-based RPC executors are used, retrieves the number of Calls that were
picked from the tail of the queue (indicating adaptive LIFO mode, when
in the period of overloade we serve last requests first); returns 0 otherwise.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getPriorityQueueLength--">getPriorityQueueLength</a></span>()</code>
<div class="block">Retrieves length of the priority queue for metrics.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getReadQueueLength--">getReadQueueLength</a></span>()</code>
<div class="block">Retrieves length of the read queue for metrics when use RWQueueRpcExecutor.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getReplicationQueueLength--">getReplicationQueueLength</a></span>()</code>
<div class="block">Retrieves length of the replication queue for metrics.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getScanQueueLength--">getScanQueueLength</a></span>()</code>
<div class="block">Retrieves length of the scan queue for metrics when use RWQueueRpcExecutor.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#getWriteQueueLength--">getWriteQueueLength</a></span>()</code>
<div class="block">Retrieves length of the write queue for metrics when use RWQueueRpcExecutor.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#init-org.apache.hadoop.hbase.ipc.RpcScheduler.Context-">init</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.Context.html" title="class in org.apache.hadoop.hbase.ipc">RpcScheduler.Context</a>&nbsp;context)</code>
<div class="block">Does some quick initialization.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#onConfigurationChange-org.apache.hadoop.conf.Configuration-">onConfigurationChange</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>
<div class="block">Resize call queues;</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#start--">start</a></span>()</code>
<div class="block">Prepares for request serving.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#stop--">stop</a></span>()</code>
<div class="block">Stops serving new requests.</div>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#line.63">SimpleRpcScheduler</a>(org.apache.hadoop.conf.Configuration&nbsp;conf,
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int&nbsp;priorityHandlerCount,
int&nbsp;replicationHandlerCount,
int&nbsp;metaTransitionHandler,
<a href="../../../../../org/apache/hadoop/hbase/ipc/PriorityFunction.html" title="interface in org.apache.hadoop.hbase.ipc">PriorityFunction</a>&nbsp;priority,
<a href="../../../../../org/apache/hadoop/hbase/Abortable.html" title="interface in org.apache.hadoop.hbase">Abortable</a>&nbsp;server,
int&nbsp;highPriorityLevel)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>conf</code> - </dd>
<dd><code>handlerCount</code> - the number of handler threads that will be used to process calls</dd>
<dd><code>priorityHandlerCount</code> - How many threads for priority handling.</dd>
<dd><code>replicationHandlerCount</code> - How many threads for replication handling.</dd>
<dd><code>highPriorityLevel</code> - </dd>
<dd><code>priority</code> - Function to extract request priority.</dd>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#line.132">SimpleRpcScheduler</a>(org.apache.hadoop.conf.Configuration&nbsp;conf,
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int&nbsp;priorityHandlerCount,
int&nbsp;replicationHandlerCount,
<a href="../../../../../org/apache/hadoop/hbase/ipc/PriorityFunction.html" title="interface in org.apache.hadoop.hbase.ipc">PriorityFunction</a>&nbsp;priority,
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#line.143">onConfigurationChange</a>(org.apache.hadoop.conf.Configuration&nbsp;conf)</pre>
<div class="block">Resize call queues;</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>conf</code> - new configuration</dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#line.163">init</a>(<a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.Context.html" title="class in org.apache.hadoop.hbase.ipc">RpcScheduler.Context</a>&nbsp;context)</pre>
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<div class="block">Does some quick initialization. Heavy tasks (e.g. starting threads) should be
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<dd><code><a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html#init-org.apache.hadoop.hbase.ipc.RpcScheduler.Context-">init</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html" title="class in org.apache.hadoop.hbase.ipc">RpcScheduler</a></code></dd>
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<dd><code>context</code> - provides methods to retrieve runtime information from</dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/ipc/SimpleRpcScheduler.html#line.168">start</a>()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html#start--">RpcScheduler</a></code></span></div>
<div class="block">Prepares for request serving. An implementation may start some handler threads here.</div>
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<div class="block">Stops serving new requests.</div>
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<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/ipc/RpcScheduler.html#dispatch-org.apache.hadoop.hbase.ipc.CallRunner-">RpcScheduler</a></code></span></div>
<div class="block">Dispatches an RPC request asynchronously. An implementation is free to choose to process the
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<dd><code>callTask</code> - the request to be dispatched</dd>
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<div class="block">Retrieves the number of active replication handler.</div>
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<div class="block">If CoDel-based RPC executors are used, retrieves the number of Calls that were dropped
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<div class="block">If CoDel-based RPC executors are used, retrieves the number of Calls that were
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<div class="block">Retrieves the number of active write rpc handler when use RWQueueRpcExecutor.</div>
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<div class="block">Get call queue information</div>
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