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https://issues.apache.org/jira/browse/SOLR-14928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17244869#comment-17244869
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Ilan Ginzburg commented on SOLR-14928:
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As I resumed work on this, I rebased on latest master. See branch
[here|https://github.com/murblanc/lucene-solr/tree/SOLR-14928_ClusterStateUpdater]
(forced pushed so the commits mentioned in previous posts are no longer
relevant).
Collection creation and deletion works and goes through distributed
{{state.json}} updates. The rest of the Collection API is still broken :)
The main issue with this change seems to be the assumptions made on the
completeness of the cached cluster state rather than the actual updates, at
least at this stage.
WIP, I figured out I'd post progress updates here...
> 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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