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<h2 class="title"><a id="hot-threads-api"></a>Hot Threads API<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/logstash/edit/5.3/docs/static/monitoring-apis.asciidoc">edit</a></h2>
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<div class="warning admon">
<div class="icon"></div>
<div class="admon_content">
<p>This functionality is in technical preview and may be changed or removed in a future release. Elastic will apply best effort to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.</p>
</div>
</div>
<p>The hot threads API gets the current hot threads for Logstash. A hot thread is a
Java thread that has high CPU usage and executes for a longer than normal period
of time.</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">GET /_node/hot_threads</pre>
</div>
<p>The output is a JSON document that contains a breakdown of the top hot threads for
Logstash.</p>
<p>Example response:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">{
"time": "2017-01-12T12:09:45-08:00",
"busiest_threads": 3,
"threads": [
{
"name": "LogStash::Runner",
"percent_of_cpu_time": 1.07,
"state": "timed_waiting",
"traces": [
"java.lang.Object.wait(Native Method)",
"java.lang.Thread.join(Thread.java:1253)",
"org.jruby.internal.runtime.NativeThread.join(NativeThread.java:75)",
"org.jruby.RubyThread.join(RubyThread.java:697)",
"org.jruby.RubyThread$INVOKER$i$0$1$join.call(RubyThread$INVOKER$i$0$1$join.gen)",
"org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:663)",
"org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:198)",
"org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:306)",
"org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:136)",
"org.jruby.ast.CallNoArgNode.interpret(CallNoArgNode.java:60)"
]
},
{
"name": "[main]>worker7",
"percent_of_cpu_time": 0.71,
"state": "waiting",
"traces": [
"sun.misc.Unsafe.park(Native Method)",
"java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)",
"java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)",
"java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireInterruptibly(AbstractQueuedSynchronizer.java:897)",
"java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1222)",
"java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:335)",
"org.jruby.RubyThread.lockInterruptibly(RubyThread.java:1470)",
"org.jruby.ext.thread.Mutex.lock(Mutex.java:91)",
"org.jruby.ext.thread.Mutex.synchronize(Mutex.java:147)",
"org.jruby.ext.thread.Mutex$INVOKER$i$0$0$synchronize.call(Mutex$INVOKER$i$0$0$synchronize.gen)"
]
},
{
"name": "[main]>worker3",
"percent_of_cpu_time": 0.71,
"state": "waiting",
"traces": [
"sun.misc.Unsafe.park(Native Method)",
"java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)",
"java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)",
"java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireInterruptibly(AbstractQueuedSynchronizer.java:897)",
"java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1222)",
"java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:335)",
"org.jruby.RubyThread.lockInterruptibly(RubyThread.java:1470)",
"org.jruby.ext.thread.Mutex.lock(Mutex.java:91)",
"org.jruby.ext.thread.Mutex.synchronize(Mutex.java:147)",
"org.jruby.ext.thread.Mutex$INVOKER$i$0$0$synchronize.call(Mutex$INVOKER$i$0$0$synchronize.gen)"
]
}
]
}
}</pre>
</div>
<p>The parameters allowed are:</p>
<div class="informaltable">
<table border="0" cellpadding="4px">
<colgroup>
<col/>
<col/>
</colgroup>
<tbody valign="top">
<tr>
<td valign="top">
<p>
<code class="literal">threads</code>
</p>
</td>
<td valign="top">
<p>
The number of hot threads to return. The default is 3.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">human</code>
</p>
</td>
<td valign="top">
<p>
If true, returns plain text instead of JSON format. The default is false.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">ignore_idle_threads</code>
</p>
</td>
<td valign="top">
<p>
If true, does not return idle threads. The default is true.
</p>
</td>
</tr>
</tbody>
</table>
</div>
<p>See <a class="xref" href="monitoring.html#monitoring-common-options" title="Common Options">Common Options</a> for a list of options that can be applied to all
Logstash monitoring APIs.</p>
<p>You can use the <code class="literal">?human</code> parameter to return the document in a human-readable format.</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">GET /_node/hot_threads?human=true</pre>
</div>
<p>Example of a human-readable response:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js"> ::: {}
Hot threads at 2017-01-12T12:10:15-08:00, busiestThreads=3:
================================================================================
1.02 % of cpu usage, state: timed_waiting, thread name: 'LogStash::Runner'
java.lang.Object.wait(Native Method)
java.lang.Thread.join(Thread.java:1253)
org.jruby.internal.runtime.NativeThread.join(NativeThread.java:75)
org.jruby.RubyThread.join(RubyThread.java:697)
org.jruby.RubyThread$INVOKER$i$0$1$join.call(RubyThread$INVOKER$i$0$1$join.gen)
org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:663)
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:198)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:306)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:136)
org.jruby.ast.CallNoArgNode.interpret(CallNoArgNode.java:60)
--------------------------------------------------------------------------------
0.71 % of cpu usage, state: waiting, thread name: '[main]>worker7'
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireInterruptibly(AbstractQueuedSynchronizer.java:897)
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1222)
java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:335)
org.jruby.RubyThread.lockInterruptibly(RubyThread.java:1470)
org.jruby.ext.thread.Mutex.lock(Mutex.java:91)
org.jruby.ext.thread.Mutex.synchronize(Mutex.java:147)
org.jruby.ext.thread.Mutex$INVOKER$i$0$0$synchronize.call(Mutex$INVOKER$i$0$0$synchronize.gen)
--------------------------------------------------------------------------------
0.71 % of cpu usage, state: timed_waiting, thread name: '[main]>worker3'
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362)
java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:941)
sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:497)
org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(JavaMethod.java:466)
org.jruby.javasupport.JavaMethod.invokeDirect(JavaMethod.java:324)</pre>
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