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

Release notes for the MapR Event Store For Apache Kafka C client included in the MapR Converged Data Platform. The notes below relate specifically to the MapR Converged Data Platform.

Version 0.9.1
Release Date April 2017
MapR Version Interoperability See MEP Components and OS Support
Package Names Package Names for MapR Ecosystem Packs (MEPs)

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.

Patches

  • 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.