ScrapCodes opened a new pull request #19096: [SPARK-21869][SS] A cached Kafka producer should not be closed if any task is using it - adds inuse tracking. URL: https://github.com/apache/spark/pull/19096 ## What changes were proposed in this pull request? We track the producer, by maintaining an `inuse` thread count of the producer. If the producer is `inuse` and we get eviction orders from guava, we move such producers to a queue(`closeQueue`) and periodically (in a non-thread way) check for its `inuse` status and eventually close it. This way a producer will not be closed while being used and also not get assigned to a new task when evicted. We had to do this because, guava has a limitation that it does not allow for custom eviction strategy. https://github.com/google/guava/issues/3013 ## How was this patch tested? Updated existing and added appropriate test case.
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