GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/21466
[MINOR][YARN] Add YARN-specific credential providers in debug logging
message
## What changes were proposed in this pull request?
This PR adds a debugging log for YARN-specific credential providers which
is loaded by service loader mechanism.
It took me a while to debug if it's actually loaded or not. I had to
explicitly set the deprecated configuration and check if that's actually being
loaded.
## How was this patch tested?
The change scope is manually tested. Logs are like:
```
Using the following builtin delegation token providers: hadoopfs, hive,
hbase.
Using the following YARN-specific credential providers: yarn-test.
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark minor-log
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21466.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 #21466
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commit 5a2b7c7c7fa5fc7ae669858c76a5dd43adfdf966
Author: hyukjinkwon <gurwls223@...>
Date: 2018-05-31T06:31:19Z
Add YARN-specific credential providers in debug logging message
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