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Posted to issues@tez.apache.org by "Bikas Saha (JIRA)" <ji...@apache.org> on 2014/03/20 20:30:46 UTC

[jira] [Commented] (TEZ-949) Handle Session Tokens for Recovery

    [ https://issues.apache.org/jira/browse/TEZ-949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942174#comment-13942174 ] 

Bikas Saha commented on TEZ-949:
--------------------------------

Why can we not use the appId instead of the randomUUID in the app master itself?

> 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
>         Attachments: TEZ-949.1.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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