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From "Wenchen Fan (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (SPARK-23989) When using `SortShuffleWriter`, the data will be overwritten
Date Wed, 18 Apr 2018 14:48:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-23989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442568#comment-16442568
] 

Wenchen Fan edited comment on SPARK-23989 at 4/18/18 2:47 PM:
--------------------------------------------------------------

OK now I see the problem, `ShuffleExchangeExec.needToCopyObjectsBeforeShuffle` doesn't catch
all the cases, so we may produce wrong result.


was (Author: cloud_fan):
OK now I see the problem, `ShuffleExchangeExec.needToCopyObjectsBeforeShuffle` doesn't catch
all the cases, so we may reproduce wrong result.

> When using `SortShuffleWriter`, the data will be overwritten
> ------------------------------------------------------------
>
>                 Key: SPARK-23989
>                 URL: https://issues.apache.org/jira/browse/SPARK-23989
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.3.0
>            Reporter: liuxian
>            Priority: Critical
>
> {color:#333333}When using `SortShuffleWriter`, we only insert  '{color}{color:#cc7832}AnyRef{color}{color:#333333}'
into '{color}PartitionedAppendOnlyMap{color:#333333}' or '{color}PartitionedPairBuffer{color:#333333}'.{color}
> {color:#333333}For this function:{color}
> {color:#cc7832}override def {color}{color:#ffc66d}write{color}(records: {color:#4e807d}Iterator{color}[Product2[{color:#4e807d}K{color}{color:#cc7832},
{color}{color:#4e807d}V{color}]])
> the value of 'records' is `UnsafeRow`, so  the value will be overwritten
> {color:#333333} {color}



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