GitHub user tgravescs opened a pull request:
https://github.com/apache/spark/pull/14718
[SPARK-16711] YarnShuffleService doesn't re-init properly on YARN rolling
upgrade
The Spark Yarn Shuffle Service doesn't re-initialize the application
credentials early enough which causes any other spark executors trying to fetch
from that node during a rolling upgrade to fail with
"java.lang.NullPointerException: Password cannot be null if SASL is enabled".
Right now the spark shuffle service relies on the Yarn nodemanager to
re-register the applications, unfortunately this is after we open the port for
other executors to connect. If other executors connected before the re-register
they get a null pointer exception which isn't a re-tryable exception and cause
them to fail pretty quickly. To solve this I added another leveldb file so that
it can save and re-initialize all the applications before opening the port for
other executors to connect to it. Adding another leveldb was simpler from the
code structure point of view.
Most of the code changes are moving things to common util class.
Patch was tested manually on a Yarn cluster with rolling upgrade was
happing while spark job was running. Without the patch I consistently get the
NullPointerException, with the patch the job gets a few Connection refused
exceptions but the retries kick in and the it succeeds.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tgravescs/spark SPARK-16711
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14718.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 #14718
----
commit f0a5c564f0a1158f9432524deecd3f64243a673c
Author: Thomas Graves <tgra...@staydecay.corp.gq1.yahoo.com>
Date: 2016-08-18T18:59:29Z
[SPARK-16711] YarnShuffleService doesn't re-init properly on YARN rolling
upgrade
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