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https://issues.apache.org/jira/browse/SOLR-8069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902021#comment-14902021
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Jessica Cheng Mallet commented on SOLR-8069:
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bq. I don't think we really protect against such cases where there is only a
single leader that can accept an update
This is not the scenario I'm describing. If you have 3 replicas and one that
was the leader gets partitioned off, one of the other 2 will get elected and
they can carry on. However, during this transition time, because the cluster
state update hasn't been completed or propagated through watches, the old
leader can still get trailing updates from the client. In a normal case where
the updates are successfully forwarded to all replicas, no one cares. But in
this case, the old leader cannot forward the update to others (because it's
partitioned off), so it should not reply success to the client because that
would be wrong (it is not the leader and it does not have the right to tell the
others to recover).
> Ensure that only the valid ZooKeeper registered leader can put a replica into
> Leader Initiated Recovery.
> --------------------------------------------------------------------------------------------------------
>
> Key: SOLR-8069
> URL: https://issues.apache.org/jira/browse/SOLR-8069
> Project: Solr
> Issue Type: Bug
> Reporter: Mark Miller
> Assignee: Mark Miller
> Priority: Critical
> Attachments: SOLR-8069.patch, SOLR-8069.patch
>
>
> I've seen this twice now. Need to work on a test.
> When some issues hit all the replicas at once, you can end up in a situation
> where the rightful leader was put or put itself into LIR. Even on restart,
> this rightful leader won't take leadership and you have to manually clear the
> LIR nodes.
> It seems that if all the replicas participate in election on startup, LIR
> should just be cleared.
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