# ES 5.6.10 - Thread WAITING on java client log

**URL:** <https://discuss.elastic.co/t/es-5-6-10-thread-waiting-on-java-client-log/146786>\
**Category:** Elasticsearch\
**Created:** [August 30, 2018, 10:44pm UTC](https://discuss.elastic.co/t/es-5-6-10-thread-waiting-on-java-client-log/146786 "2018-08-30T22:44:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![eramitsinha](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/eramitsinha/32/35032_2.png) [@eramitsinha](https://discuss.elastic.co/u/eramitsinha)\
**Post date:** [August 30, 2018, 10:44pm UTC](https://discuss.elastic.co/t/es-5-6-10-thread-waiting-on-java-client-log/146786/1 "2018-08-30T22:44:12Z")

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Hi,

I am using Elastic Search 5.6.10 and Jdk 1.8.102, I was doing load testing this got failed and during Load testing(Only Search operation on Index) I am seeing lots of Thread wait on client logs/dump, any input how to fix this.

`logs:`

"Attach Listener" #922 daemon prio=9 os\_prio=0 tid=0x00007fe358001000 nid=0xa1d3 waiting on condition [0x0000000000000000]  
java.lang.Thread.State: RUNNABLE

Locked ownable synchronizers:  
- None

"elasticsearch[_client_][generic][T#5]" #836 daemon prio=5 os\_prio=0 tid=0x00007fdc80029000 nid=0x863c waiting on condition [0x00007fdde1ffc000]  
java.lang.Thread.State: WAITING (parking)  
at sun.misc.Unsafe.park(Native Method)  
- parking to wait for \<0x000000060a14bfe8\> (a org.elasticsearch.common.util.concurrent.EsExecutors$ExecutorScalingQueue)  
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)  
at java.util.concurrent.LinkedTransferQueue.awaitMatch(LinkedTransferQueue.java:737)  
at java.util.concurrent.LinkedTransferQueue.xfer(LinkedTransferQueue.java:647)  
at java.util.concurrent.LinkedTransferQueue.take(LinkedTransferQueue.java:1269)  
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)  
at java.lang.Thread.run(Thread.java:745)

Locked ownable synchronizers:  
- None  
.......................................Other trace from log...................................................................................  
"elasticsearch[_client_][transport\_client\_boss][T#62]" #570 daemon prio=5 os\_prio=0 tid=0x00007fddf001a800 nid=0x3da4 runnable [0x00007fdbdb8bf000]  
java.lang.Thread.State: RUNNABLE  
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)  
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)  
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)  
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)  
- locked \<0x00000005cf7e9140\> (a sun.nio.ch.Util$3)  
- locked \<0x00000005cf7e9130\> (a java.util.Collections$UnmodifiableSet)  
- locked \<0x00000005cf7e9018\> (a sun.nio.ch.EPollSelectorImpl)  
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)  
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:752)  
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:408)  
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)  
at java.lang.Thread.run(Thread.java:745)

Locked ownable synchronizers:  
- None

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 27, 2018, 10:44pm UTC](https://discuss.elastic.co/t/es-5-6-10-thread-waiting-on-java-client-log/146786/2 "2018-09-27T22:44:22Z")

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