Hi. We have a SolrCloud setup with 20 shards, each with only 1 replica, served on 8 servers.
After a server went down we are left with 16 shards, which means that some of the compositeId hash ranges aren't hosted by any cores. Somehow the shards/cores didn't come back after the server came up again. I can see the server in /live_nodes. But all is not bad: The data in the collection is volatile with a TTS of 30 minutes, and we have a failover in place that tries a new random compositeId whenever an "add" operation fails. My question is: Is it possible to re-create the missing shards or do I have to delete and create the collection from scratch? I know which hash ranges are are missing, but the CREATESHARD [1] API call doesn't support shards with the 'compositeId' router. And I cannot use SPLITSHARD [2] since it only divides the original shard's hash. Best regards, Henrik [1] https://cwiki.apache.org/confluence/display/solr/Collections+API#CollectionsAPI-api8 [2] https://cwiki.apache.org/confluence/display/solr/Collections+API#CollectionsAPI-api3
