GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/12190
[SPARK-14119] [SQL] Improve HashedRelation for key fit within Long
## What changes were proposed in this pull request?
Currently, we use java HashMap for HashedRelation if the key could fit
within a Long. The java HashMap and CompactBuffer are not memory efficient, the
memory used by them is also accounted accurately.
This PR introduce a LongToUnsafeRowMap (similar to BytesToBytesMap) for
better memory efficiency and performance.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark long_map2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12190.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 #12190
----
commit b02b1d128fd8108a9af64e0cd7db65a7fcacca26
Author: Davies Liu <dav...@databricks.com>
Date: 2016-04-05T04:56:35Z
LongToUnsafeRowMap
commit 1b68736b72e0cc710a01ccbfd46e957b2fa5132f
Author: Davies Liu <dav...@databricks.com>
Date: 2016-04-06T00:08:47Z
update benchmark & cleanup
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