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  1. Hadoop Common
  2. HADOOP-886

thousands of TimerThreads created by metrics API

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.10.1
    • Fix Version/s: 0.11.0
    • Component/s: metrics
    • Labels:
      None

      Description

      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.

        Attachments

        1. 886.patch
          2 kB
          Nigel Daley

          Activity

            People

            • Assignee:
              nidaley Nigel Daley
              Reporter:
              nidaley Nigel Daley
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              Dates

              • Created:
                Updated:
                Resolved: