GitHub user hachikuji opened a pull request:
https://github.com/apache/kafka/pull/3426
MINOR: Fix race condition in KafkaConsumer close
We intended to make `KafkaConsumer.close()` idempotent, but due to the fact
that the `closed` variable is checked without a lock prior to beginning close
logic, it is possible for two or more threads to see `closed=false` and attempt
to close.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hachikuji/kafka
minor-fix-consumer-idempotent-close
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/3426.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 #3426
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