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https://issues.apache.org/jira/browse/TEZ-949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13943799#comment-13943799
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Siddharth Seth commented on TEZ-949:
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If we move to a state when multiple clients needs to submit to the same session
- then this will need to be moved into the AM, along with persisting the
generated token for recovery. For now though, this looks good.
> Handle Session Tokens for Recovery
> ----------------------------------
>
> Key: TEZ-949
> URL: https://issues.apache.org/jira/browse/TEZ-949
> Project: Apache Tez
> Issue Type: Sub-task
> Reporter: Siddharth Seth
> Assignee: Hitesh Shah
> Fix For: 0.4.0
>
> Attachments: TEZ-949.1.patch, TEZ-949.2.patch
>
>
> The tokens used by Fetchers to connect to the ShuffleHandler are generated in
> the AM. Once an AM is restarted, the token will be regenerated - and new
> Reduces will not be able to fetch output from previous Mappers.
> Similar to MAPREDUCE-5042.
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