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From "Rui Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20032) Don't serialize hashCode when groupByShuffle and RDD cacheing is disabled
Date Thu, 12 Jul 2018 03:19:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16541076#comment-16541076
] 

Rui Li commented on HIVE-20032:
-------------------------------

Hi [~stakiar], thanks for working on this. There're other cases where RDD is cached, e.g.
parallel order by. So you need to serialize the hash code in all these cases (maybe multi-insert
is another one).
Having separate SerDe for caching and shuffling would be good. But I guess that needs help
from Spark side. And btw, have you run benchmarks to get the improvements of this change?

> Don't serialize hashCode when groupByShuffle and RDD cacheing is disabled
> -------------------------------------------------------------------------
>
>                 Key: HIVE-20032
>                 URL: https://issues.apache.org/jira/browse/HIVE-20032
>             Project: Hive
>          Issue Type: Improvement
>          Components: Spark
>            Reporter: Sahil Takiar
>            Assignee: Sahil Takiar
>            Priority: Major
>         Attachments: HIVE-20032.1.patch, HIVE-20032.2.patch, HIVE-20032.3.patch
>
>
> Follow up on HIVE-15104, if we don't enable RDD cacheing or groupByShuffles, then we
don't need to serialize the hashCode when shuffling data in HoS.



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