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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-886) thousands of TimerThreads created by metrics API
Date Fri, 12 Jan 2007 03:50:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12464092
] 

Nigel Daley commented on HADOOP-886:
------------------------------------

Digging around some more, I found that this is the call stack that creates the threads.

        at org.apache.hadoop.metrics.spi.AbstractMetricsContext.startTimer(AbstractMetricsContext.java:239)
        at org.apache.hadoop.metrics.spi.AbstractMetricsContext.startMonitoring(AbstractMetricsContext.java:153)
        at org.apache.hadoop.metrics.file.FileContext.startMonitoring(FileContext.java:105)
        at org.apache.hadoop.metrics.Metrics.createRecord(Metrics.java:60)
        at org.apache.hadoop.mapred.ReduceTask$ReduceTaskMetrics.<init>(ReduceTask.java:53)
        at org.apache.hadoop.mapred.ReduceTask.<init>(ReduceTask.java:87)
        at org.apache.hadoop.mapred.TaskInProgress.getTaskToRun(TaskInProgress.java:527)
        at org.apache.hadoop.mapred.JobInProgress.obtainNewReduceTask(JobInProgress.java:359)
        at org.apache.hadoop.mapred.JobTracker.getNewTaskForTaskTracker(JobTracker.java:1200)
        at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:992)
        at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:337)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:538)


> thousands of TimerThreads created by metrics API
> ------------------------------------------------
>
>                 Key: HADOOP-886
>                 URL: https://issues.apache.org/jira/browse/HADOOP-886
>             Project: Hadoop
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.10.1
>            Reporter: Nigel Daley
>
> When running the smallJobsBenchmark with 180 maps and hadoop metrics logging to a file

> (ie hadoop-metrics.properties file contains 
>      dfs.class=org.apache.hadoop.metrics.file.FileContext
>      mapred.class=org.apache.hadoop.metrics.file.FileContext)
> then I get this error:
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: java.lang.OutOfMemoryError:
unable to create new native thread
> 	at java.lang.Thread.start0(Native Method)
> 	at java.lang.Thread.start(Thread.java:574)
> 	at org.apache.hadoop.ipc.Client.getConnection(Client.java:517)
> 	at org.apache.hadoop.ipc.Client.call(Client.java:452)
> 	at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:164)
> 	at org.apache.hadoop.dfs.$Proxy0.isDir(Unknown Source)
> 	at org.apache.hadoop.dfs.DFSClient.isDirectory(DFSClient.java:325)
> 	at org.apache.hadoop.dfs.DistributedFileSystem.isDirectory(DistributedFileSystem.java:167)
> 	at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:82)
> 	at org.apache.hadoop.dfs.DistributedFileSystem.copyToLocalFile(DistributedFileSystem.java:222)
> 	at org.apache.hadoop.fs.FileSystem.copyToLocalFile(FileSystem.java:842)
> 	at org.apache.hadoop.mapred.JobInProgress.<init>(JobInProgress.java:86)
> 	at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:1338)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:585)
> 	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:337)
> 	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:538)
> 	at org.apache.hadoop.ipc.Client$Connection.run(Client.java:258)
> Using jconsole, I see that 2000+ of these threads were created:
> Name: Timer-101
> State: TIMED_WAITING on java.util.TaskQueue@1501026
> Total blocked: 0  Total waited: 5
> Stack trace: 
> java.lang.Object.wait(Native Method)
> java.util.TimerThread.mainLoop(Timer.java:509)
> java.util.TimerThread.run(Timer.java:462)
> The only use of the java.util.Timer API is in org.apache.hadoop.metrics.spi.AbstractMetricsContext.

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