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Posted to mapreduce-issues@hadoop.apache.org by "Karthik Kambatla (JIRA)" <ji...@apache.org> on 2013/03/28 01:59:15 UTC

[jira] [Created] (MAPREDUCE-5110) Long task launch delays can lead to multiple parallel attempts of the task

Karthik Kambatla created MAPREDUCE-5110:
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             Summary: Long task launch delays can lead to multiple parallel attempts of the task
                 Key: MAPREDUCE-5110
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5110
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: tasktracker
    Affects Versions: 1.1.2
            Reporter: Karthik Kambatla
            Assignee: Karthik Kambatla


If a task takes too long to launch, the JT expires the task and schedules another attempt. The earlier attempt can start after the later attempt leading to two parallel attempts running at the same time. This is particularly an issue if the user turns off speculation and expects a single attempt of a task to run at any point in time.

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