The Apache Helix team would like to announce the release of Apache Helix 0.9.9.

This is the twenty-third release under the Apache umbrella, and the nineteenth as a top-level project.

Helix is a generic cluster management framework used for the automatic management of partitioned, replicated and distributed resources hosted on a cluster of nodes.

Key Note for Helix Release

In this release, there are three type of configuration for ZK write limitations:

  • jute.maxbuffer: This used to be consistent with jute maxbuffer set for ZkClient. So if your data size is over this value, write is not allowed.
  • zk.serializer.znrecord.write.size.limit.bytes: If the ZNode size is larger than the value you set (even after compression), the data will NOT be written to ZK at ZNRecorderSerializer level. Default is 1MB
  • If the ZNode size is larger than the value you set, compression will be applied for this ZNode.

Detailed Changes


  • Add separate ZK serializer configuration to active ZNRecord compression when size exceeds a threshold. #1901
  • Validate data write size limit in ZkClient #1072

Cheers, -- The Apache Helix Team

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