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https://issues.apache.org/jira/browse/SOLR-12176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16423724#comment-16423724
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Cao Manh Dat commented on SOLR-12176:
-------------------------------------
Zombie leader is a leader won the election (created
"/collections/leaders/shard/leader") but does not exist in clusterstate. The
idea of the patch is finding such zombie leader and unload it.
> Improve FORCELEADER to handle the case when a replica win the election but
> does not present in clusterstate
> -----------------------------------------------------------------------------------------------------------
>
> Key: SOLR-12176
> URL: https://issues.apache.org/jira/browse/SOLR-12176
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Cao Manh Dat
> Assignee: Cao Manh Dat
> Priority: Major
> Attachments: SOLR-12176.patch
>
>
> There can be the case when a replica wins the election but it does not
> present in clusterstate. Maybe when the Overseer sent the UNLOAD request to
> the LEADER (in DeleteReplicaCmd), it met some exception (therefore the
> request never reach the LEADER), the Overseer it that case will forcefully
> remove the LEADER from clusterstate.
> If a shard reaches that case, users will only see a leaderless shard and call
> FORCELEADER won't be able to solve their problem. Therefore FORCELEADER
> should be more robust, to handle such cases.
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