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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1862) reduces are getting stuck trying to find map outputs
Date Mon, 10 Sep 2007 10:50:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12526123

Arun C Murthy commented on HADOOP-1862:

Hmm... one straw to clutch:


$ cat 1862-event.log | grep task_200709041519_0023_m_001149
OBSOLETE task_200709041519_0023_m_001149_0 http://a.a.com:50060/tasklog?plaintext=true&taskid=task_200709041519_0023_m_001149_0
FAILED task_200709041519_0023_m_001149_0 null
SUCCEEDED task_200709041519_0023_m_001149_1 http://b.a.com:50060/tasklog?plaintext=true&taskid=task_200709041519_0023_m_001149_1
SUCCEEDED task_200709041519_0023_m_001149_2 http://c.a.com:50060/tasklog?plaintext=true&taskid=task_200709041519_0023_m_001149_2

$ cat 1862-event.log | grep task_200709041519_0023_m_001816
OBSOLETE task_200709041519_0023_m_001816_0 http://x.a.com:50060/tasklog?plaintext=true&taskid=task_200709041519_0023_m_001816_0
FAILED task_200709041519_0023_m_001816_0 null
SUCCEEDED task_200709041519_0023_m_001816_1 http://y.a.com:50060/tasklog?plaintext=true&taskid=task_200709041519_0023_m_001816_1
SUCCEEDED task_200709041519_0023_m_001816_2 http://z.a.com:50060/tasklog?plaintext=true&taskid=task_200709041519_0023_m_001816_2


Essentially, in {{JobInProgress.updateTaskStatuses(TaskInProgress, TaskStatus, JobTrackerMetrics)}}
the {{TaskCompletionEvent.Status.SUCCEEDED}} is added irrespective of whether the TIP is already
complete or not, leading to each reducer seeing 2 {{TaskCompletionEvent.Status.SUCCEEDED}}
events as above... clearly the fetch from one of them will fail since either _1 or _2 will
be {{KILLED}}, not a happy situation. 

Like I said, I'll try to dig deeper, maybe this could help someone beat me to it. *smile*

> reduces are getting stuck trying to find map outputs
> ----------------------------------------------------
>                 Key: HADOOP-1862
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1862
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.14.1
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>            Priority: Blocker
>             Fix For: 0.15.0
> Some of the reduces have been stuck for hours looking for 137 map outputs. When I look
at the job events all 2600 of the maps have succeeded. There have been lots of lost task trackers
and shuffle failures. The maps have been run between 1 to 6 times each. I do see some of the
events in the task event log are marked OBSOLETE.

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