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https://issues.apache.org/jira/browse/HADOOP-886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465318
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Sameer Paranjpye commented on HADOOP-886:
-----------------------------------------
+1
Reviewed.
> 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
> Assigned To: Nigel Daley
> Attachments: 886.patch
>
>
> 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 [EMAIL PROTECTED]
> 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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