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https://issues.apache.org/jira/browse/SOLR-13410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536153#comment-17536153
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ASF subversion and git services commented on SOLR-13410:
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Commit a383179e88473695d2acad378b19e19294923c96 in lucene-solr's branch
refs/heads/branch_8_11 from David Smiley
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=a383179e884 ]
SOLR-16145: NPE fix in rejoinOverseerElection (#793)
Fix very rare NPE in SolrCloud rejoinOverseerElection.
Introduced by SOLR-13410
Backported from
https://github.com/apache/solr/commit/ef2b725931ddd547e08d0f13f96e985f22653e4a
> Designated overseer not able to become overseer quickly
> --------------------------------------------------------
>
> Key: SOLR-13410
> URL: https://issues.apache.org/jira/browse/SOLR-13410
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 9.0
> Reporter: Kesharee Nandan Vishwakarma
> Assignee: Ishan Chattopadhyaya
> Priority: Major
> Fix For: 7.7.2, 8.1
>
> Attachments: SOLR-13410.patch, SOLR-13410.patch, SOLR-13410.patch,
> SOLR-13410.patch, overseerElection.log
>
>
> Whenever a designated overseer node is restarted and overseer role is added
> back if a designated node is not overseer leader following tasks take place:
> 1. one by one nodes from electionNodes list become leader and ask designated
> node `to come join election at head`
> 2. current overseer node Fires Quit command and exits from Overseer Loop
> 3. Next node from `Overseer Loop` becomes leader repeats steps 1,2 until
> designated overseer node becomes the leader
> Problem with above flow: OverseerNodePrioritizer is not able to add
> `designated node` at the head of electionNodes list
> Steps to reproduce:
> # Setup solrcloud with 5 nodes, including one designated overseer
> # Restart overseer container
> Attached relevant logs
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