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Posted to dev@lucene.apache.org by "Shalin Shekhar Mangar (JIRA)" <ji...@apache.org> on 2015/06/10 17:57:00 UTC
[jira] [Created] (SOLR-7660) Avoid redundant 'exists' calls made to
ZK while fetching cluster state updates
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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