[jira] [Created] (SOLR-4395) Create a mechanism to promote a replica to leader

["Yago Riveiro (JIRA)" <ji...@apache.org>]

Yago Riveiro created SOLR-4395:
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             Summary: Create a mechanism to promote a replica to leader
                 Key: SOLR-4395
                 URL: https://issues.apache.org/jira/browse/SOLR-4395
             Project: Solr
          Issue Type: New Feature
          Components: SolrCloud
            Reporter: Yago Riveiro
            Priority: Minor


In following scenario:

# Cluster compose by 2 nodes, node A and node B.
# Two collection:
- Collection 1 with the leader in a A and the replica in B and 
- Collection 2 with the leader in B and the replica in A.

If a node A goes down, then the replica of collection 2 located in node A will be promote to leader to respect the failover. 

If the node A comes back online again, we have the scenario where all leader are in the same node. This maybe can be have performance issues in indexing throughput.

I think that can be desirable have a mechanism to promote one replica to leader and recover the initial layout to leverage the physical machines, I/O CPU and so on.

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