MapR Event Store For Apache Kafka C Client 0.9.1 - 1703 Release Notes

New in This Release

This is the initial release of the MapR Event Store For Apache Kafka C Client. You can use MapR Event Store For Apache Kafka C Client on MapR cluster version 5.2.1 and above.

Fixes

• Fix for bug 778 (Double free when using "topic.blacklist" setting) has been backported into this release.

Known Issues and Limitations

• MapR-26629:Application memory usage may be high due to fragmentation when Glibc Malloc is in use. In this case, consider tuning the MAX_MALLOC_ARENA environment variable or the M_ARENA_MAX tunable to a lower value, such as 1. When the value is 1, the amount of fragmentation decreases and the memory usage generally decreases by 3 or 4 times as well.
• MapR-26602:Kafka script bin/kafka-consumer-groups.sh cannot be used to obtain the consumer group list.
• MapR-26331:MapR Event Store For Apache Kafka C Client commits when "enable.auto.commit"= true and "auto.commit.interval.ms"=0. Apache librdkafka, does not commit in this case.
• MapR-26279:When a producer application creates multiple threads using pthread_create() and also calls rd_kafka_destroy(), the Streams C client logs the following error:

  rdkafka.c:527:rd_kafka_destroy_app: assert: !*"failed to join main thread" 

  This issue also occurs with Apache librdkafka 0.9.1.

Resolved Issues

None.