GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/9383
[SPARK-11425] Improve Hybrid aggregation
After aggregation, the dataset could be smaller than inputs, so it's better
to do hash based aggregation for all inputs, then using sort based aggregation
to merge them.
This PR include #9381, will rebase once that one is merged.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark fix_switch
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9383.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #9383
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commit 374ec3b8406c4da25382d65bb0118671da54cda1
Author: Davies Liu <[email protected]>
Date: 2015-10-29T20:10:35Z
remove prepare
commit fed4ab64d0865a1b6a0d8e3cc443a45e44fd7ad4
Author: Davies Liu <[email protected]>
Date: 2015-10-30T17:53:47Z
remove dead code
commit 258d27524ddbd0b8df62c27a269f74b2a819027c
Author: Davies Liu <[email protected]>
Date: 2015-10-30T19:03:41Z
fix mima
commit 5707f5b3421fdab0b01ee2a66acf50b59752152b
Author: Davies Liu <[email protected]>
Date: 2015-10-30T19:08:29Z
Do hash-based aggregation for all records before switch to sort-based
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