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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-4921) Performance issue caused by TaskSetManager returning PROCESS_LOCAL for NO_PREF tasks
Date Mon, 29 Dec 2014 19:01:13 GMT

    [ https://issues.apache.org/jira/browse/SPARK-4921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260322#comment-14260322
] 

Sandy Ryza commented on SPARK-4921:
-----------------------------------

Offline [~xuefuz] and [~lirui] mentioned to me that the query they noticed this with was
{code}
select count(*) from store_sales where ss_sold_date_sk is not null;
{code}

> Performance issue caused by TaskSetManager returning  PROCESS_LOCAL for NO_PREF tasks
> -------------------------------------------------------------------------------------
>
>                 Key: SPARK-4921
>                 URL: https://issues.apache.org/jira/browse/SPARK-4921
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.2.0
>            Reporter: Xuefu Zhang
>         Attachments: NO_PREF.patch
>
>
> During research for HIVE-9153, we found that TaskSetManager returns PROCESS_LOCAL for
NO_PREF tasks, which may caused performance degradation. Changing the return value to NO_PREF,
as demonstrated in the attached patch, seemingly improves the performance.



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