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From "Wei Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11566) Hybrid grace hash join should only allocate write buffer for a hash partition when first write happens
Date Fri, 14 Aug 2015 20:28:46 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wei Zheng updated HIVE-11566:
-----------------------------
    Description: 
Currently it's allocating one write buffer for a number of hash partitions up front, which
causes GC pause.

It's better to do the write buffer allocation on demand.

  was:
Currently it's allocating a write buffer for a fixed number of hash partitions up front, which
causes GC pause.

It's better to do the write buffer allocation on demand.


> Hybrid grace hash join should only allocate write buffer for a hash partition when first
write happens
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-11566
>                 URL: https://issues.apache.org/jira/browse/HIVE-11566
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>            Reporter: Wei Zheng
>            Assignee: Wei Zheng
>
> Currently it's allocating one write buffer for a number of hash partitions up front,
which causes GC pause.
> It's better to do the write buffer allocation on demand.



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