GitHub user srowen opened a pull request:
https://github.com/apache/spark/pull/17567
[SPARK-19991][CORE][YARN] FileSegmentManagedBuffer performance improvement
## What changes were proposed in this pull request?
Avoid `NoSuchElementException` every time `ConfigProvider.get(val,
default)` falls back to default. This apparently causes non-trivial overhead in
at least one path, and can easily be avoided.
See https://github.com/apache/spark/pull/17329
## How was this patch tested?
Existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/srowen/spark SPARK-19991
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17567.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 #17567
----
commit 3828d03caea6326659c33b37b599081d69ba8106
Author: Sean Owen <so...@cloudera.com>
Date: 2017-04-07T16:53:01Z
Avoid NoSuchElementException every time ConfigProvider.get(val, default)
falls back to default
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