Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/2994#issuecomment-61040608
I talked to people working on Kafka, and they assure me it is thread-safe.
Also see this:
https://github.com/apache/flume/blob/trunk/flume-ng-channels/flume-kafka-channel/src/main/java/org/apache/flume/channel/kafka/KafkaChannel.java
There is a single producer that is written to by various threads. See the
corresponding test where it is written from multiple threads. I have run it in
loops several times on travis, never seen a threading issue.
By creating a Producer per partition, this issue is avoided anyway. For
now, we can keep it simple by creating a producer per partition - if we see
this is a problem, we can revert to the ProducerCache.
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