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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7372) Select query gives unpredictable incorrect result when parallelism is greater than 1 [Spark Branch]
Date Fri, 11 Jul 2014 05:40:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14058416#comment-14058416
] 

Xuefu Zhang commented on HIVE-7372:
-----------------------------------

Patch committed to Spark branch. Thanks, Chengxiang.

> Select query gives unpredictable incorrect result when parallelism is greater than 1
[Spark Branch]
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-7372
>                 URL: https://issues.apache.org/jira/browse/HIVE-7372
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Xuefu Zhang
>            Assignee: Chengxiang Li
>         Attachments: HIVE-7372-Spark.1.patch, HIVE-7372.patch
>
>
> In SparkClient.java, if the following property is set, unpredictable, incorrect result
may be observed.
> {code}
>     sparkConf.set("spark.default.parallelism", "1");
> {code}
> It's suspected that there are some concurrency issues, as Spark may process multiple
datasets in a single JVM when parallelism is greater than 1 in order to use multiple cores.
> NO PRECOMMIT TESTS. This is for spark branch only.



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