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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17669) Cache to optimize SearchArgument deserialization
Date Wed, 11 Oct 2017 23:21:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201174#comment-16201174
] 

Prasanth Jayachandran commented on HIVE-17669:
----------------------------------------------

[~mithun] I did not pull this into branch-2.2 as this is perf optimization and not bug fix.
Do you want to revert the patch from branch-2.2 or commit the patch to branch-2.3 as well
to sync the branches? I am fine with either. 

> Cache to optimize SearchArgument deserialization
> ------------------------------------------------
>
>                 Key: HIVE-17669
>                 URL: https://issues.apache.org/jira/browse/HIVE-17669
>             Project: Hive
>          Issue Type: Improvement
>          Components: ORC, Query Processor
>    Affects Versions: 2.2.0, 3.0.0
>            Reporter: Mithun Radhakrishnan
>            Assignee: Mithun Radhakrishnan
>             Fix For: 3.0.0, 2.4.0
>
>         Attachments: HIVE-17669.3.patch, HIVE-17669.4.patch, HIVE-17699.1.patch, HIVE-17699.2.patch
>
>
> And another, from [~selinazh] and [~cdrome]. (YHIVE-927)
> When a mapper needs to process multiple ORC files, it might land up having use essentially
the same {{SearchArgument}} over several files. It would be good not to have to deserialize
from string, over and over again. Caching the object against the string-form should speed
things up.



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