0.10.5 (31.01.2017)
Enhancements
(688) Selective algorithm healing
Improved durability of assignments during restarts and zookeeper flaps.
Reporting of assignments and running consumers has been improved and made consistent.
More reliable handling of consumer processes.
Migration guide:
To utilize these improvements it is required to stop all instances in hermes cluster, remove all nodes from {zookeeper.root}/consumers-workload/{kafka.cluster.name}/runtime and restart instances.
This adds a marker in selective algorithm's consumer assignments, which allows rebalancing with removing automatically created assignments.
Alternatively, to avoid switching off your cluster, a script updating assignments' zookeeper nodes' data to AUTO_ASSIGNED can be used. It should be also applied after all nodes run the new version, as previous run could shuffle assignments during deployment.