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https://issues.apache.org/jira/browse/MAPREDUCE-2175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joydeep Sen Sarma resolved MAPREDUCE-2175.
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Resolution: Duplicate
sorry - already opened mapreduce-2062 covering this
> speculation framework does not update job progress rate with time causing
> false speculation
> -------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2175
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2175
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Reporter: Joydeep Sen Sarma
>
> When considering task speculation - the job's overall progress rate for the
> given task type and the individual task's progress rate are compared. When
> doing so - the task's current progress rate is considered. However the job's
> overall progress rate is only only updated when a task's progress report is
> received.
> This causes weirdness if a particular task does not report for a while. The
> job's progress rate is not updated - but the task's progress rate decays. For
> single task jobs - it causes speculation almost inevitably.
> We need to update the job's overall progress rate as the task's progress rate
> changes.
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