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https://issues.apache.org/jira/browse/SOLR-6554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14228825#comment-14228825
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Shalin Shekhar Mangar commented on SOLR-6554:
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I looked into the multi method in zk but it's limitation is that the combined
payload of all the operations in a multi call must be less than 1MB
(jute.maxbuffer limit) so it can be a bit tricky to implement.
> 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.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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