GitHub user jinxing64 opened a pull request:
https://github.com/apache/spark/pull/18031
Record accurate size of blocks in MapStatus when it's above threshold.
## What changes were proposed in this pull request?
Currently, when number of reduces is above 2000, HighlyCompressedMapStatus
is used to store size of blocks. in HighlyCompressedMapStatus, only average
size is stored for non empty blocks. Which is not good for memory control when
we shuffle blocks. It makes sense to store the accurate size of block when it's
above threshold.
## How was this patch tested?
Added test in MapStatusSuite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jinxing64/spark SPARK-20801
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18031.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 #18031
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