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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6724) Unsafe conversion from long to int in MergeManagerImpl.unconditionalReserve()
Date Mon, 18 Jul 2016 21:18:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15383085#comment-15383085
] 

Daniel Templeton commented on MAPREDUCE-6724:
---------------------------------------------

Works for me.  I'd not say that the value is irrelevant, though.  It's just not part of that
test.  (If you set it to some terrible value, I guarantee it would be relevant.)  Maybe just
say it's not needed in this test.

> Unsafe conversion from long to int in MergeManagerImpl.unconditionalReserve()
> -----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6724
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6724
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>         Attachments: mapreduce6724.001.patch, mapreduce6724.002.patch, mapreduce6724.003.patch,
mapreduce6724.004.patch
>
>
> When shuffle is done in memory, MergeManagerImpl converts the requested size to an int
to allocate an instance of InMemoryMapOutput. This results in an overflow if the requested
size is bigger than Integer.MAX_VALUE and eventually causes the reducer to fail.



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