GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/9067
Use mixing hash-based and sort-based aggregation in
TungstenAggregationIterator
JIRA: https://issues.apache.org/jira/browse/SPARK-11055
In TungstenAggregationIterator we switch to sort-based aggregation when we
can't allocate more memory for hashmap.
However, using external sorter-based aggregation will write too much
key-value pairs into disk. We should use mixing hash-based and sort-based
aggregation to reduce the key-value pairs needed to write to disk.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 sort-and-hash-tungsten-iterator
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9067.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 #9067
----
commit dd98d574c42c520f260404af7b53af9f64cad20b
Author: Liang-Chi Hsieh <[email protected]>
Date: 2015-10-11T18:07:26Z
Use mixing hash-based and sort-based aggregation in
TungstenAggregationIterator.
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