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Posted to dev@lucene.apache.org by "Ramkumar Aiyengar (JIRA)" <ji...@apache.org> on 2014/07/20 22:17:38 UTC

[jira] [Created] (SOLR-6261) Run checkIfIamLeader in a separate thread

Ramkumar Aiyengar created SOLR-6261:
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             Summary: Run checkIfIamLeader in a separate thread
                 Key: SOLR-6261
                 URL: https://issues.apache.org/jira/browse/SOLR-6261
             Project: Solr
          Issue Type: Improvement
          Components: SolrCloud
    Affects Versions: 4.9
            Reporter: Ramkumar Aiyengar
            Priority: Minor


Currently checking for leadership (due to the leader's ephemeral node going away) happens in ZK's event thread. If there are many cores and all of them are due leadership, then they would have to serially go through the two-way sync and leadership takeover.

For tens of cores, this could mean 30-40s without leadership before the last in the list even gets to start the leadership process. If the leadership process happens in a separate thread, then the cores could all take over in parallel.



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