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https://issues.apache.org/jira/browse/SOLR-6554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14230266#comment-14230266
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Shalin Shekhar Mangar commented on SOLR-6554:
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bq. What kind of confidence do we have for stateFormat = 2 now?
I am pretty confident that it works and works well. But the client side needs a
fix before 5.0 -- SOLR-6521.
bq. It would really be nice to drop 1 from 5x rather than deal with both for a
full major version again.
I agree but how do we drop 1? I haven't thought through the migration process.
It would probably need us to write the state to both places for one Solr
release to auto-convert. Otherwise an upgrade would require down-time. We could
definitely use stateFormat=2 as the default in 5.0 as it is already as
performant as stateFormat=1 for the single collection use-case.
> Speed up overseer operations for collections with stateFormat > 1
> -----------------------------------------------------------------
>
> Key: SOLR-6554
> URL: https://issues.apache.org/jira/browse/SOLR-6554
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 5.0, Trunk
> Reporter: Shalin Shekhar Mangar
> Attachments: SOLR-6554-batching-refactor.patch,
> SOLR-6554-batching-refactor.patch, SOLR-6554-batching-refactor.patch,
> SOLR-6554-batching-refactor.patch, SOLR-6554.patch, SOLR-6554.patch,
> SOLR-6554.patch, SOLR-6554.patch, SOLR-6554.patch, SOLR-6554.patch,
> SOLR-6554.patch, SOLR-6554.patch
>
>
> Right now (after SOLR-5473 was committed), a node watches a collection only
> if stateFormat=1 or if that node hosts at least one core belonging to that
> collection.
> This means that a node which is the overseer operates on all collections but
> watches only a few. So any read goes directly to zookeeper which slows down
> overseer operations.
> Let's have the overseer node watch all collections always and never remove
> those watches (except when the collection itself is deleted).
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