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https://issues.apache.org/jira/browse/MAPREDUCE-4128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252773#comment-13252773
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Bikas Saha commented on MAPREDUCE-4128:
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yeah. I asked the same question in my previous reviews but there was no clear
clean method to solve this. :(
I guess we might have to add a global suppress for this specific warning.
Having tons of @suppress on all these functions would be messy.
Do you have any clues on the Avro thing? My web search did not return anything
useful. I moved the new successfulTaskAttempt field to the end. That led to NPE
later on because Avro set null values into my
TaskFinishedEvent.successfulAttemptId. So I had to check for null in
TaskFinishedEvent. I dont like it this way.
Now the test passes. Is there a better way to do this?
> AM Recovery expects all attempts of a completed task to also be completed.
> --------------------------------------------------------------------------
>
> Key: MAPREDUCE-4128
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4128
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 3.0.0
> Reporter: Bikas Saha
> Assignee: Bikas Saha
> Fix For: 3.0.0
>
> Attachments: MAPREDUCE-4128-1.patch, MAPREDUCE-4128.patch
>
>
> The AM seems to assume that all attempts of a completed task (from a previous
> AM incarnation) would also be completed. There is at least one case in which
> this does not hold. Case being cancellation of a completed task resulting in
> a new running attempt.
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