Ilan Ginzburg created SOLR-14928:
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Summary: Remove Overseer ClusterStateUpdater
Key: SOLR-14928
URL: https://issues.apache.org/jira/browse/SOLR-14928
Project: Solr
Issue Type: Sub-task
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrCloud
Reporter: Ilan Ginzburg
Assignee: Ilan Ginzburg
Remove the Overseer {{ClusterStateUpdater}} thread and associated Zookeeper
queue at {{<_chroot_>/overseer/queue}}.
Change cluster state updates so that each (Collection API) command execution
does the update directly in Zookeeper using optimistic locking (Compare and
Swap on the {{state.json}} Zookeeper files).
Following this change cluster state updates would still be happening only from
the Overseer node (that's where Collection API commands are executing), but the
code will be ready for distribution once such commands can be executed by any
node (other work done in the context of parent task SOLR-14927).
See the [Cluster State
Updater|https://docs.google.com/document/d/1u4QHsIHuIxlglIW6hekYlXGNOP0HjLGVX5N6inkj6Ok/edit#heading=h.ymtfm3p518c]
section in the Removing Overseer doc.
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