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