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https://issues.apache.org/jira/browse/TEZ-808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14957531#comment-14957531
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Rohini Palaniswamy commented on TEZ-808:
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bq. In practice I believe getting the IO progress story right will solve the
problem for >90% of the cases
This holds true as well as even if processors miss reporting progress, it
would still proceed when data is being read and written out as more than 90% of
the jobs will fall into that category.
> Handle task attempts that are not making progress
> -------------------------------------------------
>
> Key: TEZ-808
> URL: https://issues.apache.org/jira/browse/TEZ-808
> Project: Apache Tez
> Issue Type: Sub-task
> Reporter: Bikas Saha
>
> If a task attempt is not making progress then it may cause the job to hang.
> We may want to kill and restart the attempt. With speculation support and
> free resources we may want to run another version in parallel.
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