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https://issues.apache.org/jira/browse/SOLR-8173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894821#comment-15894821
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Frank Kelly commented on SOLR-8173:
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I agree.
This is a critical problem when ZooKeeper and Solr disagree as who the leader
there needs to be a winner rather stay in some unrecoverable state. Even if it
just randomly picked one shard - a fully operational but slightly "off" search
index is better than no index at all.
> CLONE - Leader recovery process can select the wrong leader if all replicas
> for a shard are down and trying to recover as well as lose updates that
> should have been recovered.
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-8173
> URL: https://issues.apache.org/jira/browse/SOLR-8173
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: Matteo Grolla
> Assignee: Mark Miller
> Priority: Critical
> Labels: leader, recovery
> Attachments: solr_8983.log, solr_8984.log
>
>
> I'm doing this test
> collection test is replicated on two solr nodes running on 8983, 8984
> using external zk
> initially both nodes are empty
> 1)turn on solr 8983
> 2)add,commit a doc x con solr 8983
> 3)turn off solr 8983
> 4)turn on solr 8984
> 5)shortly after (leader still not elected) turn on solr 8983
> 6)8984 is elected as leader
> 7)doc x is present on 8983 but not on 8984 (check issuing a query)
> In attachment are the solr.log files of both instances
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