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Date: Fri, 21 Oct 2011 12:42:32 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3226) Few reduce tasks hanging in a
 gridmix-run
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132622#comment-13132622 ] 

Hudson commented on MAPREDUCE-3226:
-----------------------------------

Integrated in Hadoop-Hdfs-0.23-Build #46 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/46/])
    Merge -c 1187116 from trunk to branch-0.23 to complete fix for MAPREDUCE-3226.

acmurthy : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1187119
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/EventFetcher.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/Fetcher.java

                
> Few reduce tasks hanging in a gridmix-run
> -----------------------------------------
>
>                 Key: MAPREDUCE-3226
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3226
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, task
>    Affects Versions: 0.23.0
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Blocker
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-3226-20111020.txt
>
>
> In a gridmix run with ~1000 jobs, one job is getting stuck because of 2-3 hanging reducers. All of the them are stuck after downloading all map outputs and have the following thread dump.
> {code}
> "EventFetcher for fetching Map Completion Events" daemon prio=10 tid=0xa325fc00 nid=0x1ca4 waiting on condition [0xa315c000]
>    java.lang.Thread.State: TIMED_WAITING (sleeping)
>         at java.lang.Thread.sleep(Native Method)
>         at org.apache.hadoop.mapreduce.task.reduce.EventFetcher.run(EventFetcher.java:71)
> "main" prio=10 tid=0x080ed400 nid=0x1c71 in Object.wait() [0xf73a2000]
>    java.lang.Thread.State: WAITING (on object monitor)
>         at java.lang.Object.wait(Native Method)
>         - waiting on <0xa94b23d8> (a org.apache.hadoop.mapreduce.task.reduce.EventFetcher)
>         at java.lang.Thread.join(Thread.java:1143)
>         - locked <0xa94b23d8> (a org.apache.hadoop.mapreduce.task.reduce.EventFetcher)
>         at java.lang.Thread.join(Thread.java:1196)
>         at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:135)
>         at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:367)
>         at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:147)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:396)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1135)
>         at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:142)
> {code}
> Thanks to [~karams] for helping track this down.

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