Shalin Shekhar Mangar created SOLR-7660:
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Summary: Avoid redundant 'exists' calls made to ZK while fetching
cluster state updates
Key: SOLR-7660
URL: https://issues.apache.org/jira/browse/SOLR-7660
Project: Solr
Issue Type: Improvement
Components: SolrCloud
Reporter: Shalin Shekhar Mangar
Assignee: Shalin Shekhar Mangar
Priority: Minor
Fix For: 5.3, Trunk
As noted in
https://issues.apache.org/jira/browse/SOLR-7636?focusedCommentId=14578332&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14578332
{quote}
we have CollectionsHandler -> ZK getChildren (/live_nodes) + ZK read
(/clusterstate.json) + ZK getChildren + N * ZK exists (for getIndividualColls)
+ W * ZK exists + W * getData (for watched collections) + (N-W) * ZK exists +
(N-W) * ZK getData (for non-watched collections).
{quote}
Some of the ZK exists calls can be avoided without the outcome.
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