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https://issues.apache.org/jira/browse/SOLR-12087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16402548#comment-16402548
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Jerry Bao commented on SOLR-12087:
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I've updated the description with more information.
> Deleting replicas sometimes fails and causes the replicas to exist in the
> down state
> ------------------------------------------------------------------------------------
>
> Key: SOLR-12087
> URL: https://issues.apache.org/jira/browse/SOLR-12087
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 7.2
> Reporter: Jerry Bao
> Priority: Critical
> Attachments: Screen Shot 2018-03-16 at 11.50.32 AM.png
>
>
> Sometimes when deleting replicas, the replica fails to be removed from the
> cluster state. This occurs especially when deleting replicas en mass; the
> resulting cause is that the data is deleted but the replicas aren't removed
> from the cluster state. Attempting to delete the downed replicas causes
> failures because the core does not exist anymore.
> This also occurs when trying to move replicas, since that move is an add and
> delete.
> Some more information regarding this issue; when the MOVEREPLICA command is
> issued, the new replica is created successfully but the replica to be deleted
> fails to be removed from state.json (the core is deleted though) and we see
> two logs spammed.
> # The node containing the leader replica continually attempts to initiate
> recovery on the replica and fails to do so because the core does not exist.
> As a result it continually publishes a down state for the replica to
> zookeeper.
> # The replica node spams that it cannot locate the core because it's been
> deleted.
> During this period of time, we see an increase in ZK network connectivity
> overall, until the replica is finally deleted (spamming DELETEREPLICA on the
> shard until its removed from the state)
> My guess is there's two issues at hand here:
> # The leader continually attempts to recover a downed replica that is
> unrecoverable because the core does not exist.
> # The replica to be deleted is having trouble being deleted from state.json
> in ZK.
> This is mostly consistent for my use case. I'm running 7.2.1 with 66 nodes.
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