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<h2 title="Class RequestThrottler" class="title">Class RequestThrottler</h2>
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<li>org.apache.zookeeper.server.RequestThrottler</li>
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<pre>public class <span class="typeNameLabel">RequestThrottler</span>
extends <a href="../../../../org/apache/zookeeper/server/ZooKeeperCriticalThread.html" title="class in org.apache.zookeeper.server">ZooKeeperCriticalThread</a></pre>
<div class="block">When enabled, the RequestThrottler limits the number of outstanding requests
currently submitted to the request processor pipeline. The throttler augments
the limit imposed by the <code>globalOutstandingLimit</code> that is enforced
by the connection layer (<a href="../../../../org/apache/zookeeper/server/NIOServerCnxn.html" title="class in org.apache.zookeeper.server"><code>NIOServerCnxn</code></a>, <a href="../../../../org/apache/zookeeper/server/NettyServerCnxn.html" title="class in org.apache.zookeeper.server"><code>NettyServerCnxn</code></a>).
The connection layer limit applies backpressure against the TCP connection by
disabling selection on connections once the request limit is reached. However,
the connection layer always allows a connection to send at least one request
before disabling selection on that connection. Thus, in a scenario with 40000
client connections, the total number of requests inflight may be as high as
40000 even if the <code>globalOustandingLimit</code> was set lower.
The RequestThrottler addresses this issue by adding additional queueing. When
enabled, client connections no longer submit requests directly to the request
processor pipeline but instead to the RequestThrottler. The RequestThrottler
is then responsible for issuing requests to the request processors, and
enforces a separate <code>maxRequests</code> limit. If the total number of
outstanding requests is higher than <code>maxRequests</code>, the throttler
will continually stall for <code>stallTime</code> milliseconds until
underlimit.
The RequestThrottler can also optionally drop stale requests rather than
submit them to the processor pipeline. A stale request is a request sent
by a connection that is already closed, and/or a request whose latency
will end up being higher than its associated session timeout. The notion
of staleness is configurable, @see Request for more details.
To ensure ordering guarantees, if a request is ever dropped from a connection
that connection is closed and flagged as invalid. All subsequent requests
inflight from that connection are then dropped as well.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#RequestThrottler-org.apache.zookeeper.server.ZooKeeperServer-">RequestThrottler</a></span>(<a href="../../../../org/apache/zookeeper/server/ZooKeeperServer.html" title="class in org.apache.zookeeper.server">ZooKeeperServer</a> zks)</code> </td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#getDropStaleRequests--">getDropStaleRequests</a></span>()</code> </td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#getInflight--">getInflight</a></span>()</code> </td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#getMaxRequests--">getMaxRequests</a></span>()</code> </td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#getStallTime--">getStallTime</a></span>()</code> </td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#run--">run</a></span>()</code> </td>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#setDropStaleRequests-boolean-">setDropStaleRequests</a></span>(boolean drop)</code> </td>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#setMaxRequests-int-">setMaxRequests</a></span>(int requests)</code> </td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#setStallTime-int-">setStallTime</a></span>(int time)</code> </td>
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<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#shouldThrottleOp-org.apache.zookeeper.server.Request-long-">shouldThrottleOp</a></span>(<a href="../../../../org/apache/zookeeper/server/Request.html" title="class in org.apache.zookeeper.server">Request</a> request,
long elapsedTime)</code> </td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#shutdown--">shutdown</a></span>()</code> </td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#submitRequest-org.apache.zookeeper.server.Request-">submitRequest</a></span>(<a href="../../../../org/apache/zookeeper/server/Request.html" title="class in org.apache.zookeeper.server">Request</a> request)</code> </td>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/RequestThrottler.html#throttleWake--">throttleWake</a></span>()</code> </td>
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href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#dumpStack--" title="class or interface in java.lang">dumpStack</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#enumerate-java.lang.Thread:A-" title="class or interface in java.lang">enumerate</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getAllStackTraces--" title="class or interface in java.lang">getAllStackTraces</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getContextClassLoader--" title="class or interface in java.lang">getContextClassLoader</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getDefaultUncaughtExceptionHandler--" title="class or interface in java.lang">getDefaultUncaughtExceptionHandler</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getId--" title="class or interface in java.lang">getId</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getName--" title="class or interface in java.lang">getName</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getPriority--" title="class or interface in java.lang">getPriority</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getStackTrace--" title="class or interface in java.lang">getStackTrace</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getState--" title="class or interface in java.lang">getState</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getThreadGroup--" title="class or interface in java.lang">getThreadGroup</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#getUncaughtExceptionHandler--" title="class or interface in java.lang">getUncaughtExceptionHandler</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#holdsLock-java.lang.Object-" title="class or interface in java.lang">holdsLock</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#interrupt--" title="class or interface in java.lang">interrupt</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#interrupted--" title="class or interface in java.lang">interrupted</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#isAlive--" title="class or interface in java.lang">isAlive</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#isDaemon--" title="class or interface in java.lang">isDaemon</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#isInterrupted--" title="class or interface in java.lang">isInterrupted</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#join--" title="class or interface in java.lang">join</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#join-long-" title="class or interface in java.lang">join</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#join-long-int-" title="class or interface in java.lang">join</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#resume--" title="class or interface in java.lang">resume</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#setContextClassLoader-java.lang.ClassLoader-" title="class or interface in java.lang">setContextClassLoader</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#setDaemon-boolean-" title="class or interface in java.lang">setDaemon</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#setDefaultUncaughtExceptionHandler-java.lang.Thread.UncaughtExceptionHandler-" title="class or interface in java.lang">setDefaultUncaughtExceptionHandler</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#setName-java.lang.String-" title="class or interface in java.lang">setName</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#setPriority-int-" title="class or interface in java.lang">setPriority</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#setUncaughtExceptionHandler-java.lang.Thread.UncaughtExceptionHandler-" title="class or interface in java.lang">setUncaughtExceptionHandler</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#sleep-long-" title="class or interface in java.lang">sleep</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#sleep-long-int-" title="class or interface in java.lang">sleep</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#start--" title="class or interface in java.lang">start</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#stop--" title="class or interface in java.lang">stop</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#stop-java.lang.Throwable-" title="class or interface in java.lang">stop</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#suspend--" title="class or interface in java.lang">suspend</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#yield--" title="class or interface in java.lang">yield</a></code></li>
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<h3>Methods inherited from class java.lang.<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></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h4>RequestThrottler</h4>
<pre>public RequestThrottler(<a href="../../../../org/apache/zookeeper/server/ZooKeeperServer.html" title="class in org.apache.zookeeper.server">ZooKeeperServer</a> zks)</pre>
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<h4>shouldThrottleOp</h4>
<pre>protected boolean shouldThrottleOp(<a href="../../../../org/apache/zookeeper/server/Request.html" title="class in org.apache.zookeeper.server">Request</a> request,
long elapsedTime)</pre>
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<pre>public static int getMaxRequests()</pre>
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<pre>public static void setMaxRequests(int requests)</pre>
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<pre>public static int getStallTime()</pre>
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<pre>public static void setStallTime(int time)</pre>
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<pre>public static boolean getDropStaleRequests()</pre>
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<pre>public static void setDropStaleRequests(boolean drop)</pre>
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<h4>run</h4>
<pre>public void run()</pre>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true#run--" title="class or interface in java.lang">run</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#run--" title="class or interface in java.lang">run</a></code> in class <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a></code></dd>
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<pre>public void throttleWake()</pre>
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<h4>submitRequest</h4>
<pre>public void submitRequest(<a href="../../../../org/apache/zookeeper/server/Request.html" title="class in org.apache.zookeeper.server">Request</a> request)</pre>
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<pre>public int getInflight()</pre>
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<pre>public void shutdown()</pre>
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