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https://issues.apache.org/jira/browse/SOLR-6554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14230056#comment-14230056
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Mark Miller commented on SOLR-6554:
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bq. or stateFormat = 1 has gone away
What kind of confidence do we have for stateFormat = 2 now? It would really be
nice to drop 1 from 5x rather than deal with both for a full major version
again.
> 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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