1.1.0 (02.07.2019)

Enhancements

(1033) Zookeeper multi datacenter

With the multi Zookeeper clusters, it's possible to increase Hermes isolation between data-centres.

In the end this change increase high-availability of Hermes.

Changes are only in hermes-management module which from now on can operate on multiple Zookeeper clusters.

To match Kafka clusters with Zookeeper clusters we have an additional field in a hermes-config called datacenter.

This field allows you to tell Hermes which Zookeeper cluster belongs to which Kafka cluster.

When there is only one Zookeeper cluster then it will be used for every Kafka cluster.

If you're migrating from previous version you need to add storage.clusters field in hermes-config and move storage.connectionString inside it (datacenter field is irrelevant when you have only 1 Zookeeper cluster).

Example:

kafka:
  clusters:
    -
      datacenter: dc1
      clusterName: kafka_primary
      connectionString: kafka-zookeeper:2181/clusters/dc1
    -
      datacenter: dc2
      clusterName: kafka_secondary
      connectionString: kafka-zookeeper:2181/clusters/dc2

storage:
  pathPrefix: /run/hermes
  clusters:
    - 
      datacenter: dc
      clusterName: zk
      connectionString: zookeeper:2181