GitHub user tdas opened a pull request:
https://github.com/apache/spark/pull/20655
[SPARK-23484][SS] Fix possible race condition in KafkaContinuousReader
## What changes were proposed in this pull request?
var `KafkaContinuousReader.knownPartitions` should be threadsafe as it is
accessed from multiple threads - the query thread at the time of reader factory
creation, and the epoch tracking thread at the time of `needsReconfiguration`.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tdas/spark SPARK-23484
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20655.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 #20655
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commit 30412bff951bdc332c1ee54fedc97b6835f8be47
Author: Tathagata Das <tathagata.das1565@...>
Date: 2018-02-21T22:10:24Z
Added volatile
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