# My Elasticsearch is running at very high CPU (constantly 99%) - Need help understanding hot\_threads

**URL:** <https://discuss.elastic.co/t/my-elasticsearch-is-running-at-very-high-cpu-constantly-99-need-help-understanding-hot-threads/19078>\
**Category:** Elasticsearch\
**Created:** [August 4, 2014, 4:46pm UTC](https://discuss.elastic.co/t/my-elasticsearch-is-running-at-very-high-cpu-constantly-99-need-help-understanding-hot-threads/19078 "2014-08-04T16:46:08Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Melanie\_Zamora](https://avatars.discourse-cdn.com/v4/letter/m/45deac/32.png) [@Melanie\_Zamora](https://discuss.elastic.co/u/Melanie_Zamora)\
**Post date:** [August 4, 2014, 4:46pm UTC](https://discuss.elastic.co/t/my-elasticsearch-is-running-at-very-high-cpu-constantly-99-need-help-understanding-hot-threads/19078/1 "2014-08-04T16:46:08Z")

</div>

Hello,

My ES node is running very high and this is the thread from running  
hot\_threads. Can someone help me understand why CPU is so high?

This is a 1 node cluster running a linux machine with 16 cores and 72GB of  
RAM.

::: [c9q9o027][VTde-tWsTcm9oe7vBZuadA][inet[/10.1.6.21:9300]]

48.3% (241.3ms out of 500ms) cpu usage by thread 'elasticsearch[c9q9o027][search][T#3]'  
10/10 snapshots sharing following 17 elements  
org.apache.lucene.search.ConstantScoreQuery$ConstantScorer.score(ConstantScoreQuery.java:245)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:627)  
org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:167)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:491)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:448)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:281)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:269)  
org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:119)  
org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:233)  
org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:202)  
org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:80)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)  
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
java.lang.Thread.run(Unknown Source)

48.3% (241.3ms out of 500ms) cpu usage by thread 'elasticsearch[c9q9o027][search][T#8]'  
2/10 snapshots sharing following 23 elements  
org.apache.lucene.search.ConstantScoreQuery$ConstantScorer.docID(ConstantScoreQuery.java:190)  
org.apache.lucene.search.DisjunctionScorer.heapAdjust(DisjunctionScorer.java:58)  
org.apache.lucene.search.DisjunctionSumScorer.nextDoc(DisjunctionSumScorer.java:54)  
org.elasticsearch.common.lucene.docset.DocIdSets.toFixedBitSet(DocIdSets.java:143)  
org.elasticsearch.common.lucene.docset.DocIdSets.toSafeBits(DocIdSets.java:134)  
org.elasticsearch.common.lucene.search.FilteredCollector.setNextReader(FilteredCollector.java:69)  
org.elasticsearch.common.lucene.MultiCollector.setNextReader(MultiCollector.java:68)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:618)  
org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:167)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:491)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:448)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:281)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:269)  
org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:119)  
org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:233)  
org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:202)  
org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:80)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)  
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
java.lang.Thread.run(Unknown Source)  
8/10 snapshots sharing following 23 elements  
org.apache.lucene.search.ConstantScoreQuery$ConstantScorer.docID(ConstantScoreQuery.java:190)  
org.apache.lucene.search.DisjunctionSumScorer.nextDoc(DisjunctionSumScorer.java:61)  
org.apache.lucene.search.DisjunctionSumScorer.nextDoc(DisjunctionSumScorer.java:53)  
org.elasticsearch.common.lucene.docset.DocIdSets.toFixedBitSet(DocIdSets.java:143)  
org.elasticsearch.common.lucene.docset.DocIdSets.toSafeBits(DocIdSets.java:134)  
org.elasticsearch.common.lucene.search.FilteredCollector.setNextReader(FilteredCollector.java:69)  
org.elasticsearch.common.lucene.MultiCollector.setNextReader(MultiCollector.java:68)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:618)  
org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:167)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:491)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:448)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:281)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:269)  
org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:119)  
org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:233)  
org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:202)  
org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:80)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)  
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
java.lang.Thread.run(Unknown Source)

39.8% (199.2ms out of 500ms) cpu usage by thread 'elasticsearch[c9q9o027][search][T#15]'  
10/10 snapshots sharing following 23 elements  
org.elasticsearch.common.lucene.search.XBooleanFilter.getDocIdSet(XBooleanFilter.java:224)  
org.elasticsearch.common.lucene.search.ApplyAcceptedDocsFilter.getDocIdSet(ApplyAcceptedDocsFilter.java:45)  
org.apache.lucene.search.FilteredQuery$1.scorer(FilteredQuery.java:128)  
org.apache.lucene.search.QueryWrapperFilter$1.iterator(QueryWrapperFilter.java:59)  
org.elasticsearch.common.lucene.docset.DocIdSets.toSafeBits(DocIdSets.java:130)  
org.elasticsearch.common.lucene.search.FilteredCollector.setNextReader(FilteredCollector.java:69)  
org.elasticsearch.common.lucene.MultiCollector.setNextReader(MultiCollector.java:68)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:618)  
org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:167)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:491)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:448)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:281)  
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:269)  
org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:119)  
org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:233)  
org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:202)  
org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:80)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)  
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)  
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
java.lang.Thread.run(Unknown Source)

::: [DeWolff, Jean][Z2ezcYq2QDiEwHjnbsLiYQ][inet[/10.1.6.21:9301]]{client=true, data=false}

```
0.9% (4.6ms out of 500ms) cpu usage by thread '<redis'
 10/10 snapshots sharing following 35 elements
   java.lang.Object.wait(Native Method)
   org.jruby.RubyThread.sleep(RubyThread.java:864)
   org.jruby.RubyKernel.sleep(RubyKernel.java:801)
   org.jruby.RubyKernel$INVOKER$s$0$1$sleep.call(RubyKernel$INVOKER$s$0$1$sleep.gen)
   org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:646)
   org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:205)
   org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:168)
   org.jruby.ast.FCallOneArgNode.interpret(FCallOneArgNode.java:36)
   org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
   org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
   org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
   org.jruby.ast.RescueBodyNode.interpret(RescueBodyNode.java:108)
   org.jruby.ast.RescueNode.handleException(RescueNode.java:177)
   org.jruby.ast.RescueNode.interpret(RescueNode.java:123)
   org.jruby.ast.BeginNode.interpret(BeginNode.java:83)
   org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
   org.jruby.ast.WhileNode.interpret(WhileNode.java:131)
   org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
   org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
   org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:75)
   org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:225)
   org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:204)
   org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:346)
   org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:204)
   org.jruby.ast.FCallSpecialArgNode.interpret(FCallSpecialArgNode.java:41)
   org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
   org.jruby.evaluator.ASTInterpreter.INTERPRET_BLOCK(ASTInterpreter.java:112)
   org.jruby.runtime.Interpreted19Block.evalBlockBody(Interpreted19Block.java:209)
   org.jruby.runtime.Interpreted19Block.yield(Interpreted19Block.java:197)
   org.jruby.runtime.Interpreted19Block.call(Interpreted19Block.java:128)
   org.jruby.runtime.Block.call(Block.java:89)
   org.jruby.RubyProc.call(RubyProc.java:261)
   org.jruby.RubyProc.call(RubyProc.java:213)
   org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:98)
   java.lang.Thread.run(Unknown Source)

0.0% (127.8micros out of 500ms) cpu usage by thread 'elasticsearch[DeWolff, Jean][transport_client_timer][T#1]{Hashed wheel timer #1}'
 10/10 snapshots sharing following 5 elements
   java.lang.Thread.sleep(Native Method)
   org.elasticsearch.common.netty.util.HashedWheelTimer$Worker.waitForNextTick(HashedWheelTimer.java:467)
   org.elasticsearch.common.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:376)
   org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
   java.lang.Thread.run(Unknown Source)

0.0% (51.4micros out of 500ms) cpu usage by thread 'JRubyWorker-8'
 10/10 snapshots sharing following 9 elements
   sun.misc.Unsafe.park(Native Method)
   java.util.concurrent.locks.LockSupport.park(Unknown Source)
   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
   java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
   java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
   java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
   java.lang.Thread.run(Unknown Source)

```

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---

<div class="post-metadata">

**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\
**Post date:** [August 4, 2014, 5:31pm UTC](https://discuss.elastic.co/t/my-elasticsearch-is-running-at-very-high-cpu-constantly-99-need-help-understanding-hot-threads/19078/2 "2014-08-04T17:31:32Z")

</div>

Do you run many segments in your shards? If so, you should consider to run  
optimize.

Jörg

On Mon, Aug 4, 2014 at 6:46 PM, Melanie Zamora [mzamora@springcm.com](mailto:mzamora@springcm.com) wrote:

> Hello,
> 
> My ES node is running very high and this is the thread from running  
> hot\_threads. Can someone help me understand why CPU is so high?
> 
> This is a 1 node cluster running a linux machine with 16 cores and 72GB of  
> RAM.
> 
> ::: [c9q9o027][VTde-tWsTcm9oe7vBZuadA][inet[/10.1.6.21:9300]]
> 
> 48.3% (241.3ms out of 500ms) cpu usage by thread 'elasticsearch[c9q9o027][search][T#3]'  
> 10/10 snapshots sharing following 17 elements  
> org.apache.lucene.search.ConstantScoreQuery$ConstantScorer.score(ConstantScoreQuery.java:245)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:627)  
> org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:167)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:491)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:448)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:281)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:269)  
> org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:119)  
> org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:233)  
> org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:202)  
> org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:80)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)  
> java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
> java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
> java.lang.Thread.run(Unknown Source)
> 
> 48.3% (241.3ms out of 500ms) cpu usage by thread 'elasticsearch[c9q9o027][search][T#8]'  
> 2/10 snapshots sharing following 23 elements  
> org.apache.lucene.search.ConstantScoreQuery$ConstantScorer.docID(ConstantScoreQuery.java:190)  
> org.apache.lucene.search.DisjunctionScorer.heapAdjust(DisjunctionScorer.java:58)  
> org.apache.lucene.search.DisjunctionSumScorer.nextDoc(DisjunctionSumScorer.java:54)  
> org.elasticsearch.common.lucene.docset.DocIdSets.toFixedBitSet(DocIdSets.java:143)  
> org.elasticsearch.common.lucene.docset.DocIdSets.toSafeBits(DocIdSets.java:134)  
> org.elasticsearch.common.lucene.search.FilteredCollector.setNextReader(FilteredCollector.java:69)  
> org.elasticsearch.common.lucene.MultiCollector.setNextReader(MultiCollector.java:68)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:618)  
> org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:167)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:491)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:448)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:281)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:269)  
> org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:119)  
> org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:233)  
> org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:202)  
> org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:80)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)  
> java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
> java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
> java.lang.Thread.run(Unknown Source)  
> 8/10 snapshots sharing following 23 elements  
> org.apache.lucene.search.ConstantScoreQuery$ConstantScorer.docID(ConstantScoreQuery.java:190)  
> org.apache.lucene.search.DisjunctionSumScorer.nextDoc(DisjunctionSumScorer.java:61)  
> org.apache.lucene.search.DisjunctionSumScorer.nextDoc(DisjunctionSumScorer.java:53)  
> org.elasticsearch.common.lucene.docset.DocIdSets.toFixedBitSet(DocIdSets.java:143)  
> org.elasticsearch.common.lucene.docset.DocIdSets.toSafeBits(DocIdSets.java:134)  
> org.elasticsearch.common.lucene.search.FilteredCollector.setNextReader(FilteredCollector.java:69)  
> org.elasticsearch.common.lucene.MultiCollector.setNextReader(MultiCollector.java:68)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:618)  
> org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:167)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:491)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:448)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:281)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:269)  
> org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:119)  
> org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:233)  
> org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:202)  
> org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:80)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)  
> java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
> java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
> java.lang.Thread.run(Unknown Source)
> 
> 39.8% (199.2ms out of 500ms) cpu usage by thread 'elasticsearch[c9q9o027][search][T#15]'  
> 10/10 snapshots sharing following 23 elements  
> org.elasticsearch.common.lucene.search.XBooleanFilter.getDocIdSet(XBooleanFilter.java:224)  
> org.elasticsearch.common.lucene.search.ApplyAcceptedDocsFilter.getDocIdSet(ApplyAcceptedDocsFilter.java:45)  
> org.apache.lucene.search.FilteredQuery$1.scorer(FilteredQuery.java:128)  
> org.apache.lucene.search.QueryWrapperFilter$1.iterator(QueryWrapperFilter.java:59)  
> org.elasticsearch.common.lucene.docset.DocIdSets.toSafeBits(DocIdSets.java:130)  
> org.elasticsearch.common.lucene.search.FilteredCollector.setNextReader(FilteredCollector.java:69)  
> org.elasticsearch.common.lucene.MultiCollector.setNextReader(MultiCollector.java:68)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:618)  
> org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:167)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:491)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:448)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:281)  
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:269)  
> org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:119)  
> org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:233)  
> org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:202)  
> org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:80)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)  
> org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)  
> java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
> java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
> java.lang.Thread.run(Unknown Source)
> 
> ::: [DeWolff, Jean][Z2ezcYq2QDiEwHjnbsLiYQ][inet[/10.1.6.21:9301]]{client=true, data=false}
> 
> ```
> 0.9% (4.6ms out of 500ms) cpu usage by thread '<redis'
> 10/10 snapshots sharing following 35 elements
> java.lang.Object.wait(Native Method)
> org.jruby.RubyThread.sleep(RubyThread.java:864)
> org.jruby.RubyKernel.sleep(RubyKernel.java:801)
> org.jruby.RubyKernel$INVOKER$s$0$1$sleep.call(RubyKernel$INVOKER$s$0$1$sleep.gen)
> org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:646)
> org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:205)
> org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:168)
> org.jruby.ast.FCallOneArgNode.interpret(FCallOneArgNode.java:36)
> org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
> org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
> org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
> org.jruby.ast.RescueBodyNode.interpret(RescueBodyNode.java:108)
> org.jruby.ast.RescueNode.handleException(RescueNode.java:177)
> org.jruby.ast.RescueNode.interpret(RescueNode.java:123)
> org.jruby.ast.BeginNode.interpret(BeginNode.java:83)
> org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
> org.jruby.ast.WhileNode.interpret(WhileNode.java:131)
> org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
> org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
> org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:75)
> org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:225)
> org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:204)
> org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:346)
> org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:204)
> org.jruby.ast.FCallSpecialArgNode.interpret(FCallSpecialArgNode.java:41)
> org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
> org.jruby.evaluator.ASTInterpreter.INTERPRET_BLOCK(ASTInterpreter.java:112)
> org.jruby.runtime.Interpreted19Block.evalBlockBody(Interpreted19Block.java:209)
> org.jruby.runtime.Interpreted19Block.yield(Interpreted19Block.java:197)
> org.jruby.runtime.Interpreted19Block.call(Interpreted19Block.java:128)
> org.jruby.runtime.Block.call(Block.java:89)
> org.jruby.RubyProc.call(RubyProc.java:261)
> org.jruby.RubyProc.call(RubyProc.java:213)
> org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:98)
> java.lang.Thread.run(Unknown Source)
> 
> 0.0% (127.8micros out of 500ms) cpu usage by thread 'elasticsearch[DeWolff, Jean][transport_client_timer][T#1]{Hashed wheel timer #1}'
> 10/10 snapshots sharing following 5 elements
> java.lang.Thread.sleep(Native Method)
> org.elasticsearch.common.netty.util.HashedWheelTimer$Worker.waitForNextTick(HashedWheelTimer.java:467)
> org.elasticsearch.common.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:376)
> org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
> java.lang.Thread.run(Unknown Source)
> 
> 0.0% (51.4micros out of 500ms) cpu usage by thread 'JRubyWorker-8'
> 10/10 snapshots sharing following 9 elements
> sun.misc.Unsafe.park(Native Method)
> java.util.concurrent.locks.LockSupport.park(Unknown Source)
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
> java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
> java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
> java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> java.lang.Thread.run(Unknown Source)
> 
> ```
> 
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---

<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:** [July 6, 2017, 1:10am UTC](https://discuss.elastic.co/t/my-elasticsearch-is-running-at-very-high-cpu-constantly-99-need-help-understanding-hot-threads/19078/3 "2017-07-06T01:10:55Z")

</div>