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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (SPARK-3628) Don't apply accumulator updates multiple times for tasks in result stages
Date Thu, 27 Nov 2014 01:35:12 GMT

     [ https://issues.apache.org/jira/browse/SPARK-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matei Zaharia reopened SPARK-3628:
----------------------------------

> Don't apply accumulator updates multiple times for tasks in result stages
> -------------------------------------------------------------------------
>
>                 Key: SPARK-3628
>                 URL: https://issues.apache.org/jira/browse/SPARK-3628
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>            Reporter: Matei Zaharia
>            Assignee: Nan Zhu
>            Priority: Blocker
>             Fix For: 1.2.0
>
>
> In previous versions of Spark, accumulator updates only got applied once for accumulators
that are only used in actions (i.e. result stages), letting you use them to deterministically
compute a result. Unfortunately, this got broken in some recent refactorings.
> This is related to https://issues.apache.org/jira/browse/SPARK-732, but that issue is
about applying the same semantics to intermediate stages too, which is more work and may not
be what we want for debugging.



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