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https://issues.apache.org/jira/browse/MAPREDUCE-2652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061425#comment-13061425
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Vinod Kumar Vavilapalli commented on MAPREDUCE-2652:
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bq. I still need to investigate persisting to the task log a bit to know for
sure how to handle this.
AM restart is achieved through reading job-history logs. So we can store the
shuffle address also there - that's the part of the code that you may want to
look at.
We can definitely separate out the restart-related fixes into another JIRA
issue, if that helps.
> MR-279: Cannot run multiple NMs on a single node
> -------------------------------------------------
>
> Key: MAPREDUCE-2652
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2652
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Fix For: 0.23.0
>
>
> Currently in MR-279 the Auxiliary services, like ShuffleHandler, have no way
> to communicate information back to the applications. Because of this the Map
> Reduce Application Master has hardcoded in a port of 8080 for shuffle. This
> prevents the configuration "mapreduce.shuffle.port" form ever being set to
> anything but 8080. The code should be updated to allow this information to
> be returned to the application master. Also the data needs to be persisted
> to the task log so that on restart the data is not lost.
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