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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4963) Support in memory PTF partitions
Date Sat, 24 Aug 2013 05:32:52 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13749314#comment-13749314
] 

Phabricator commented on HIVE-4963:
-----------------------------------

ashutoshc has accepted the revision "HIVE-4963 [jira] Support in memory PTF partitions".

  +1

REVISION DETAIL
  https://reviews.facebook.net/D12279

BRANCH
  HIVE-4963-2

ARCANIST PROJECT
  hive

To: JIRA, ashutoshc, hbutani

                
> Support in memory PTF partitions
> --------------------------------
>
>                 Key: HIVE-4963
>                 URL: https://issues.apache.org/jira/browse/HIVE-4963
>             Project: Hive
>          Issue Type: New Feature
>          Components: PTF-Windowing
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>         Attachments: HIVE-4963.D11955.1.patch, HIVE-4963.D12279.1.patch, HIVE-4963.D12279.2.patch,
HIVE-4963.D12279.3.patch, PTFRowContainer.patch
>
>
> PTF partitions apply the defensive mode of assuming that partitions will not fit in memory.
Because of this there is a significant deserialization overhead when accessing elements. 
> Allow the user to specify that there is enough memory to hold partitions through a 'hive.ptf.partition.fits.in.mem'
option.  
> Savings depends on partition size and in case of windowing the number of UDAFs and the
window ranges. For eg for the following (admittedly extreme) case the PTFOperator exec times
went from 39 secs to 8 secs.
>  
> {noformat}
> select t, s, i, b, f, d,
> min(t) over(partition by 1 rows between unbounded preceding and current row), 
> min(s) over(partition by 1 rows between unbounded preceding and current row), 
> min(i) over(partition by 1 rows between unbounded preceding and current row), 
> min(b) over(partition by 1 rows between unbounded preceding and current row) 
> from over10k
> {noformat}

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