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https://issues.apache.org/jira/browse/SOLR-7503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543261#comment-14543261
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Shalin Shekhar Mangar commented on SOLR-7503:
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+1 LGTM
> Recovery after ZK session expiration happens in a single thread for all cores
> in a node
> ---------------------------------------------------------------------------------------
>
> Key: SOLR-7503
> URL: https://issues.apache.org/jira/browse/SOLR-7503
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 5.1
> Reporter: Shalin Shekhar Mangar
> Assignee: Timothy Potter
> Labels: impact-high
> Fix For: Trunk, 5.2
>
> Attachments: SOLR-7503.patch
>
>
> Currently cores are registered in parallel in an executor. However, when
> there's a ZK expiration, the recovery, which also happens in the register
> call, happens in a single thread:
> https://github.com/apache/lucene-solr/blob/trunk/solr/core/src/java/org/apache/solr/cloud/ZkController.java#L300
> We should make these happen in parallel as well so that recovery after ZK
> expiration doesn't take forever.
> Thanks to [~mewmewball] for catching this.
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