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https://issues.apache.org/jira/browse/SOLR-9264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shalin Shekhar Mangar updated SOLR-9264:
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Attachment: SOLR-9264.patch
Patch which uses ZkStateReader's registerCollectionStateWatcher to wait until
all replicas are in 'down' state.
> Optimize ZkController.publishAndWaitForDownStates
> -------------------------------------------------
>
> Key: SOLR-9264
> URL: https://issues.apache.org/jira/browse/SOLR-9264
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Assignee: Shalin Shekhar Mangar
> Fix For: 6.2, master (7.0)
>
> Attachments: SOLR-9264.patch
>
>
> ZkController.publishAndWaitForDownStates keeps looping over all collections
> in the cluster state to ensure that every replica hosted on the current node
> has been marked as down. This is wasteful when you have a large number of
> collections because each access to a non-watched collection gets data from
> ZK. Instead, we can watch the interesting collections (i.e. which have
> replicas hosted locally) and wait till we see the required state.
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