[SOLR-11435] Replicas failed to be deleted can overwrite replicas of recreated collections

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 7.0
• Component/s: SolrCloud
• Assignee: Unassigned
• Reporter: Mano Kovacs
• Created: 04/Oct/17 09:54
• Updated: 21/Nov/19 00:42

Description

When a replica comes up that was deleted from ZK while it was gone, it can replace replicas in ZK if the collection an core names are equal.
Reproduction:

1. Create collection1 with 1 shard, 2 replicas on node1 and node2
2. Shut down node2
3. Delete collection1
4. Create collection1 on node1 and node3
5. Start node2

Expected:
node2 will not initialize node as it is not assigned to in ZK (legacyCloud=false)
Actual:
node2 will overwrite the baseurl in state.json for one of the replicas as the coreNodeName and the collection name will match the core it has.

Note: SOLR-7248 introduced a baseurl comparison which was removed in SOLR-10279.