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From "sam rash (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5178) JobClient hangs when getting map-task reports
Date Thu, 05 Feb 2009 22:45:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12670931#action_12670931
] 

sam rash commented on HADOOP-5178:
----------------------------------

thread dump:

"event-driver-1" prio=3 tid=0x08a97800 nid=0x12 in Object.wait() [0x71604000..0x71604bf0]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:485)
        at org.apache.hadoop.ipc.Client.call(Client.java:690)
        - locked <0x798b5918> (a org.apache.hadoop.ipc.Client$Call)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
        at org.apache.hadoop.mapred.$Proxy28.getMapTaskReports(Unknown Source)
        at org.apache.hadoop.mapred.JobClient.getMapTaskReports(JobClient.java:1014)
.....

shows it's stuck on a wait at:

public Writable call(Writable param, InetSocketAddress addr, 
                       UserGroupInformation ticket)  
                       throws InterruptedException, IOException {
    Call call = new Call(param);
    Connection connection = getConnection(addr, ticket, call);
    connection.sendParam(call);                 // send the parameter
    synchronized (call) {
      while (!call.done) {
        try {
          call.wait();                           // wait for the result   STUCK HERE
        } catch (InterruptedException ignored) {}
      }
....





> JobClient hangs when getting map-task reports
> ---------------------------------------------
>
>                 Key: HADOOP-5178
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5178
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: ipc, mapred
>    Affects Versions: 0.19.0
>            Reporter: sam rash
>
> a call to JobClient.getMapTaskReports() has been hung for 6+ days

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