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https://issues.apache.org/jira/browse/SOLR-6554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14237203#comment-14237203
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Mark Miller commented on SOLR-6554:
-----------------------------------
I don't think we need to support live migrations over major versions. I think
this really holds back development. Major releases can break all kinds of back
compat - I think the only thing we are on the hook for is a transition path -
but not a live one. Live upgrades over major releases is not very realistic IMO.
> 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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