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https://issues.apache.org/jira/browse/SOLR-12087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16397864#comment-16397864
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Sathiya N commented on SOLR-12087:
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Deletes are done via DELETE Command.
*Steps*:
1. Create a replica in new node.
2. Delete the existing replica in previous node.
and Deletes fail (sometimes) leaving the zombie replicas in a down state.
> Deleting shards sometimes fails and causes the shard 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: Major
>
> 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.
> It seems like when deleting replicas, ZK writes are timing out, preventing
> the cluster state from being properly updated.
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