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

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-8697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15252648#comment-15252648 ] 

ASF subversion and git services commented on SOLR-8697:
-------------------------------------------------------

Commit 0dabbadb4dbdabbad4da06a49e2eebd908a4cd62 in lucene-solr's branch refs/heads/branch_5x from markrmiller
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=0dabbad ]

SOLR-8697: Scope ZK election nodes by session to prevent elections from interfering with each other and other small LeaderElector improvements.


> 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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