Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/3426
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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
