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https://issues.apache.org/jira/browse/SOLR-14928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17227087#comment-17227087
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Ilan Ginzburg commented on SOLR-14928:
--------------------------------------
I pushed a first
[commit|https://github.com/murblanc/lucene-solr/commit/18339ce837a5bef0aec780842dee84257cc6d713]
to
[https://github.com/murblanc/lucene-solr/tree/SOLR-14928_ClusterStateUpdater]
to share the general approach I'm taking here (this is really really far from a
PR at this stage). I use the [implementation notes
section|https://docs.google.com/document/d/1u4QHsIHuIxlglIW6hekYlXGNOP0HjLGVX5N6inkj6Ok/edit#heading=h.33zr975cdvb4]
of the removing overseer doc to explicit (essentially to myself) what I'm
doing. Might help for looking at the code.
As usual, things are more complex than anticipated.
[~gezapeti] FYI since you expressed interest.
> 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
> Priority: Major
> Labels: cluster, collection-api, overseer
>
> 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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