[SOLR-5310] Add a collection admin command to remove a replica

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.6, 6.0
• Component/s: SolrCloud
• Assignee: Noble Paul
• Reporter: Noble Paul
• Created: 08/Oct/13 10:29
• Updated: 09/May/16 18:59
• Resolved: 29/Oct/13 11:27

Description

the only way a replica can removed is by unloading the core .There is no way to remove a replica that is down . So, the clusterstate will have unreferenced nodes if a few nodes go down over time

We need a cluster admin command to clean that up

e.g:
/admin/collections?action=DELETEREPLICA&collection=coll1&shard=shard1&replica=core_node3

The system would first see if the replica is active. If yes , a core UNLOAD command is fired , which would take care of deleting the replica from the clusterstate as well

if the state is inactive, then the core or node may be down , in that case the entry is removed from cluster state

Issue Links

• is depended upon by: SOLR-5311 Avoid registering replicas which are removed
• is duplicated by: SOLR-5131 Implement removeNode Collections API
• is related to: SOLR-6422 DELETEREPLICA exposes an inconsistent param REPLICA_PROP
• relates to: SOLR-5312 Add a remove node collection admin command