Scott Blum created SOLR-8697:
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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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