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https://issues.apache.org/jira/browse/MAPREDUCE-4089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242620#comment-13242620
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Robert Joseph Evans commented on MAPREDUCE-4089:
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>From looking at the code for Task. When TaskReporter.progress() is called,
>all it does is set the progress flag, which causes a progress update to be
>sent to the AM instead of a ping to be sent. So I would guess is that we want
>to stop counting pings when measuring progress in the AM. So it should
>probably be a simple 1 line change.
> Hung Tasks never time out.
> ---------------------------
>
> Key: MAPREDUCE-4089
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4089
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.2, 2.0.0, trunk
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Priority: Blocker
>
> The AM will timeout a task through mapreduce.task.timeout only when it does
> not hear from the task within the given timeframe. On 1.0 a task must be
> making progress, either by reading input from HDFS, writing output to HDFS,
> writing to a log, or calling a special method to inform it that it is still
> making progress.
> This is because on 0.23 a status update which happens every 3 seconds is
> counted as progress.
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