I followed the process for the single node online upgrade. Removed one node at a time that was running 4.1 CE. Upgraded to 5.0.1 and re-balanced back into the cluster.
Upon removing the (final) 04 node running 4.1 I received this error during re-balance:
Service upgrade exited with reason {service_rebalance_failed,index,
{badmatch,
{error,
{bad_nodes,index,get_agent,
[{‘ns_1@dev1-db-test03.dev.net’,
{exit,
{{noproc,
{gen_server,call,
[<19616.3328.0>,
{call,“ServiceAPI.GetTaskList”,
#Fun<json_rpc_connection.0.123522448>},
60000]}},
{gen_server,call,
[{‘service_agent-index’,
‘ns_1@dev1-db-test03.dev.net’},
get_agent,infinity]}}}}]}}}} hide
I re-balanced the 04 node back in after upgrading to 5.0.1 and the query/index services seem to work anyway. Why did I receive this error? Is there anything further I need to do in-order to upgrade the services to 5.0.1?