Updated migration guide for selective algorithm improvements in chang… #701
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adamdubiel
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Jan 31, 2017
CHANGELOG.md
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| @@ -8,6 +8,12 @@ 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. | |||
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| Migration guide: | |||
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| 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. | |||
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missing code quotes in path, also maybe use {} to denote placeholder?
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adamdubiel
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chemicL
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| This adds a marker in selective algorithm's consumer assignments, which allows rebalancing with removing automatically created assignments. | ||
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| 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. |
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I observed that the previous version almost certainly shuffles assignments during a rolling update to the latest version, so I needed to re-run the script.
adamdubiel
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