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https://issues.apache.org/jira/browse/SOLR-15052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269641#comment-17269641
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Mike Drob commented on SOLR-15052:
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I ran a test against 8.7 and 8.8 (RC1) for heavy collection creation and
monitored heap usage for the duration. I was very impressed with the
improvements I saw, much kudos to [~noble.paul] and [~ichattopadhyaya] for
driving this work!
!collection-creation.png!
In addition to the reduced heap usage, I found the collection creation API
calls to be about 10-15% faster.
> Reducing overseer bottlenecks using per-replica states
> ------------------------------------------------------
>
> Key: SOLR-15052
> URL: https://issues.apache.org/jira/browse/SOLR-15052
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Ishan Chattopadhyaya
> Assignee: Noble Paul
> Priority: Major
> Fix For: 8.8
>
> Attachments: collection-creation.png, per-replica-states-gcp.pdf
>
> Time Spent: 10.5h
> Remaining Estimate: 0h
>
> This work has the same goal as SOLR-13951, that is to reduce overseer
> bottlenecks by avoiding replica state updates from going to the state.json
> via the overseer. However, the approach taken here is different from
> SOLR-13951 and hence this work supercedes that work.
> The design proposed is here:
> https://docs.google.com/document/d/1xdxpzUNmTZbk0vTMZqfen9R3ArdHokLITdiISBxCFUg/edit
> Briefly,
> # Every replica's state will be in a separate znode nested under the
> state.json. It has the name that encodes the replica name, state, leadership
> status.
> # An additional children watcher to be set on state.json for state changes.
> # Upon a state change, a ZK multi-op to delete the previous znode and add a
> new znode with new state.
> Differences between this and SOLR-13951,
> # In SOLR-13951, we planned to leverage shard terms for per shard states.
> # As a consequence, the code changes required for SOLR-13951 were massive (we
> needed a shard state provider abstraction and introduce it everywhere in the
> codebase).
> # This approach is a drastically simpler change and design.
> Credits for this design and the PR is due to [~noble.paul].
> [[email protected]], [~noble.paul] and I have collaborated on this
> effort. The reference branch takes a conceptually similar (but not identical)
> approach.
> I shall attach a PR and performance benchmarks shortly.
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