GitHub user kiszk opened a pull request:
https://github.com/apache/spark/pull/21117
[followup][SPARK-10399][SPARK-23879][Core] Free unused off-heap memory in
MemoryBlockSuite
## What changes were proposed in this pull request?
As @viirya pointed out
[here](https://github.com/apache/spark/pull/19222#discussion_r179910484), this
PR explicitly frees unused off-heap memory in `MemoryBlockSuite`
## How was this patch tested?
Existing UTs
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kiszk/spark SPARK-10399-free-offheap
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21117.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 #21117
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commit 2c1575da5aa9ec1a7b3a8ec29457b46ecba3330e
Author: Kazuaki Ishizaki <ishizaki@...>
Date: 2018-04-20T18:31:19Z
free unused offheap
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