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Posted to dev@lucene.apache.org by "Scott Blum (JIRA)" <ji...@apache.org> on 2016/02/18 20:55:18 UTC

[jira] [Created] (SOLR-8697) Fix LeaderElector issues

Scott Blum created SOLR-8697:
--------------------------------

             Summary: Fix LeaderElector issues
                 Key: SOLR-8697
                 URL: https://issues.apache.org/jira/browse/SOLR-8697
             Project: Solr
          Issue Type: Bug
          Components: SolrCloud
    Affects Versions: 5.4.1
            Reporter: Scott Blum


This patch is still somewhat WIP for a couple of reasons:

1) Still debugging test failures.
2) This will more scrutiny from knowledgable folks!

There are some subtle bugs with the current implementation of LeaderElector, best demonstrated by the following test:

1) Start up a small single-node solrcloud.  it should be become Overseer.
2) kill -9 the solrcloud process and immediately start a new one.
3) The new process won't become overseer.  The old process's ZK leader elect node has not yet disappeared, and the new process fails to set appropriate watches.

NOTE: this is only reproducible if the new node is able to start up and join the election quickly.



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