Jerry Bao created SOLR-12087:

             Summary: Deleting shards sometimes fails and causes the shard to 
exist in the down state
                 Key: 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

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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