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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4323) Start times for some tasks are missing from task reports after job tracker restart
Date Wed, 01 Oct 2008 11:03:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635997#action_12635997

Amar Kamat commented on HADOOP-4323:

I think a tip's  start time will be missing. Tip's start time is different from attempt's
start time. Tip-start-time is the time when the jobtracker schedules the first attempt from
the tip while attempt-start-time is the time when the tracker start executing the attempt.
I dont think we can recover the exact tip-start-time but the best we can do is approximate
it to the first/oldest attempt's start time. Thoughts?

> Start times for some tasks are missing from task reports after job tracker restart
> ----------------------------------------------------------------------------------
>                 Key: HADOOP-4323
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4323
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.0
>            Reporter: Hemanth Yamijala
> When a JobTracker with the {{mapred.jobtracker.restart.recover}} option turned on, restarts,
it recovers task statuses from all tasks recorded in the history for running jobs. Task trackers
rejoin the restarted JobTracker and report the statuses of the tasks they had last run. These
tasks' start time is set to 0 in the task reports on the restarted JobTracker. This is as
seen in the web UI, or from the value of {{TaskReport.startTime}} retrieved from the job client.

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