Rebalance in of cbas node stuck for 17 hours

Build 6.5.0-2214

Observed that rebalance in of cbas node stuck for 17 hours in high bucket density test with 30 buckets.
It has 60 analytics datasets, 2 for each bucket.
Last ran this test on build 6.5.0-2082 and same rebalance took 16 mins to complete.

Logs-
Existing cbas node- https://s3.amazonaws.com/bugdb/jira/cbas_reb_stuck_hbd/collectinfo-2019-02-07T043549-ns_1%40172.23.96.23.zip
cbas node being added- https://s3.amazonaws.com/bugdb/jira/cbas_reb_stuck_hbd/collectinfo-2019-02-07T043549-ns_1%40172.23.97.15.zip
KV node- https://s3.amazonaws.com/bugdb/jira/cbas_reb_stuck_hbd/collectinfo-2019-02-07T043549-ns_1%40172.23.97.12.zip
KV node- https://s3.amazonaws.com/bugdb/jira/cbas_reb_stuck_hbd/collectinfo-2019-02-07T043549-ns_1%40172.23.97.13.zip
KV node- https://s3.amazonaws.com/bugdb/jira/cbas_reb_stuck_hbd/collectinfo-2019-02-07T043549-ns_1%40172.23.97.14.zip