Critical Description
Create a cluster of 3 nodes 5.0.1 version (224, 225 and 226)
Online upgrade cluster (swap rebalance) to Alice 6.0.0-1643 (224, 226 and 227).
Add an additional Alice node (225) to cluster, rebalance failed with error:
u'Rebalance exited with reason {service_rebalance_failed,fts,\n {rebalance_failed,\n {service_error,\n <<"planner: planPIndexesPrev.ImplVersion: 5.5.0 > version: 5.0.0">>}}}', u'shortText': u'message', u'serverTime': u'2018-09-18T09:52:48.664Z', u'module': u'ns_orchestrator', u'tstamp': 1537289568664, u'type': u'critical'}
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2018-09-18 09:52:48,922 - root - ERROR - {u'node': u'ns_1@172.23.121.227', u'code': 0, u'text': u'Bucket "default" rebalance does not seem to be swap rebalance', u'shortText': u'message', u'serverTime': u'2018-09-18T09:52:20.770Z', u'module': u'ns_vbucket_mover', u'tstamp': 1537289540770, u'type': u'info'}
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2018-09-18 09:52:48,922 - root - ERROR - {u'node': u'ns_1@172.23.121.225', u'code': 0, u'text': u'Bucket "default" loaded on node \'ns_1@172.23.121.225\' in 0 seconds.', u'shortText': u'message', u'serverTime': u'2018-09-18T09:52:18.639Z', u'module': u'ns_memcached', u'tstamp': 1537289538639, u'type': u'info'}
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2018-09-18 09:52:48,923 - root - ERROR - {u'node': u'ns_1@172.23.121.227', u'code': 0, u'text': u'Started rebalancing bucket default', u'shortText': u'message', u'serverTime': u'2018-09-18T09:52:18.361Z', u'module': u'ns_rebalancer', u'tstamp': 1537289538361, u'type': u'info'}
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2018-09-18 09:52:48,923 - root - ERROR - {u'node': u'ns_1@172.23.121.227', u'code': 4, u'text': u"Starting rebalance, KeepNodes = ['ns_1@172.23.121.224','ns_1@172.23.121.226',\n 'ns_1@172.23.121.225','ns_1@172.23.121.227'], EjectNodes = [], Failed over and being ejected nodes = []; no delta recovery nodes\n", u'shortText': u'message', u'serverTime': u'2018-09-18T09:52:18.158Z', u'module': u'ns_orchestrator', u'tstamp': 1537289538158, u'type': u'info'}
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2018-09-18 09:52:48,923 - root - ERROR - {u'node': u'ns_1@172.23.121.225', u'code': 0, u'text': u'Hot-reloaded memcached.json for config change of the following keys: [<<"scramsha_fallback_salt">>]', u'shortText': u'message', u'serverTime': u'2018-09-18T09:52:18.043Z', u'module': u'memcached_config_mgr', u'tstamp': 1537289538043, u'type': u'info'}
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I will find the last build passed this test.