Tsz Wo Nicholas Sze created RATIS-365:
-----------------------------------------

             Summary: Implement RaftServer.getGroupIds() using the key set of 
ImplMap
                 Key: RATIS-365
                 URL: https://issues.apache.org/jira/browse/RATIS-365
             Project: Ratis
          Issue Type: Improvement
          Components: server
            Reporter: Tsz Wo Nicholas Sze
            Assignee: Tsz Wo Nicholas Sze


{code:java}
//RaftServerProxy
  public Iterable<RaftGroupId> getGroupIds() throws IOException {
    return 
getImpls().stream().map(RaftServerImpl::getGroupId).collect(Collectors.toList());
  }
{code}
getGroupIds() above unnecessarily calls getImpls() and then map RaftServerImpl 
to RaftGroupId.  We may get RaftGroupId(s) directly from ImplMap.



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