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Application down frequently



Multiple threads are generated, maximum heap is utilized, and nodes are terminated. Hence, the application stops working frequently.

Error Messages

one of the thread dump from 15th logs -- Thread Dump Complete --- [ttp-apr-8080-exec-13] [ ] [ ] [ ] (ngineinterface.service.HttpAPI) ERROR| - : Unable to synchronize on requestor HDC9C5215C9315B390DAC721E7662F17D within 120 seconds: (thisThread = http-apr-8080-exec-13) (originally locked by = http-apr-8080-exec-24) (finally locked by = http-apr-8080-exec-24) at com.pega.pegarules.session.internal.PRSessionProviderImpl.getLockOnRequestor( at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked( at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked( at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequest( at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.invoke( at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact( at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine( at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine( at com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngineInner( at com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngine( at com.pega.pegarules.web.impl.WebStandardImpl.makeEtierRequest(

Steps to Reproduce

Not Applicable

Root Cause

A defect in Pegasystems’ code or rules.


As a local-change, increase the number of nodes.

Published August 19, 2019 - Updated October 8, 2020

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