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From zhongdeyin <>
Subject [GitHub] hive pull request #85: [HIVE-14160]Optimized group by within distinct data s...
Date Fri, 08 Jul 2016 08:03:19 GMT
GitHub user zhongdeyin opened a pull request:

    [HIVE-14160]Optimized group by within distinct data skew proplem

    Jira issue:
    Modify GroupByOperator.endGroup() method, while keysCurrentGroup.size() is greater than
a threshold(hive.distinct.setsize.max), will new a HashSet instead of clear set. Option hive.distinct.newset.max
is the Maximum for getting new hashset, beyond this threshold,will still execute hashset.clear().
This will ensure task stability. User can set these two client parameters themselves.

You can merge this pull request into a Git repository by running:

    $ git pull branch-1.1

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #85
commit 390fb2e30d5043cd262ad73d3c1678a268c591e3
Author: zhongdeyin <>
Date:   2016-07-08T07:38:14Z

    Optimized group by within distinct data skew proplem


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