I found 78 threads are 'parking to wait for <0x00000005a3abb250>', and no thred 
held the object 0x00000005a3abb250.what hapend?"658922022@qtp-1157567439-10404" 
daemon prio=10 tid=0x00007fde30737000 nid=0x305a waiting on condition 
[0x00007fde3763d000] java.lang.Thread.State: WAITING (parking) at 
sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000005a3abb250> 
(a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync) at 
java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) at 
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
 at 
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:964)
 at 
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1282)
 at 
java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:731)
 at 
org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.getTrackingUrl(RMAppAttemptImpl.java:480)
  at 
org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl.getTrackingUrl(RMAppImpl.java:602)
 at 
org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.AppInfo.(AppInfo.java:89)
 at 
org.apache.hadoop.yarn.server.resourcemanager.webapp.AppsBlock.render(AppsBlock.java:86)
 at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:66) at 
org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:76) 
at org.apache.hadoop.yarn.webapp.View.render(View.java:235) at 
org.apache.hadoop.yarn.webapp.view.HtmlBlock$Block.subView(HtmlBlock.java:40) 
at org.apache.hadoop.yarn.webapp.hamlet.Hamlet._(Hamlet.java:30347) at 
org.apache.hadoop.yarn.server.resourcemanager.webapp.AppsBlockWithMetrics.render(AppsBlockWithMetrics.java:29)
 at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:66) at 
org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:76) 
at org.apache.hadoop.yarn.webapp.View.render(View.java:235) at 
org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49) at 
org.apache.hadoop.yarn.webapp.hamlet.HamletImpl$EImp.v(HamletImpl.java:117) at 
org.apache.hadoop.yarn.webapp.hamlet.Hamlet$TD.(Hamlet.java:845) at 
org.apache.hadoop.yarn.webapp.view.TwoColumnLayout.render(TwoColumnLayout.java:56)
 at org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:82) at 
org.apache.hadoop.yarn.webapp.Dispatcher.render(Dispatcher.java:197) at 
org.apache.hadoop.yarn.webapp.Dispatcher.service(Dispatcher.java:156) at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at 
com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
 at 
com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178) 
at 
com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
 at 
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
 at 
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:900)
 at 
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:834)
 at 
org.apache.hadoop.yarn.server.resourcemanager.webapp.RMWebAppFilter.doFilter(RMWebAppFilter.java:84)
 at 
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:795)
 at 
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)  
at 
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
 at 
com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
 at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113) at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
  at 
org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:109)
 at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
 at 
org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1183)
 at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
 at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45) at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
 at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45) at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
 at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399) at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)  at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766) at 
org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450) at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
 at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at 
org.mortbay.jetty.Server.handle(Server.java:326) at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
 at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549) at 
org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at 
org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at 
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410) at 
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) 



     On Sunday, June 14, 2015 9:39 PM, jinhong lu <[email protected]> wrote:
   

 Hi, my RM process crash today, I found many ‘wating on condition’ in the 
jstack file. 
What is the problem? 
thanks.


BR//jinhong.lu


  

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