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

["Anshum Gupta (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-8697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anshum Gupta updated SOLR-8697:
-------------------------------
    Fix Version/s: 5.5.1
                   6.0

> 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
>            Assignee: Mark Miller
>              Labels: patch, reliability, solrcloud
>             Fix For: master, 6.0, 5.5.1
>
>         Attachments: OverseerTestFail.log, SOLR-8697-followup.patch, SOLR-8697.patch
>
>
> 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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