@DataMike    Yes, you can use the CC APIs as per your requirements [1] [2]   [1] https://docs.cloudera.com/cdp-private-cloud-base/7.1.7/cctrl-managing/topics/cctrl-using-rest-api.html [2] https://community.cloudera.com/t5/Customer/Frequently-Used-CRUISE-CONTROL-API-and-important-DOCs/ta-p/324729   From the above articles you can use the following API to rebalance topics/partitions:    curl -k --negotiate -u: -X POST "https://<CC FQDN>:8899/kafkacruisecontrol/rebalance?dryrun=false&rebalance_disk=true"   To avoid high CPU, memory and disk read write you can initiate rebalance process in batches. It will automatically create a batch and rebalance topics.   curl -X POST  "http://$HOSTNAME:8899/kafkacruisecontrol/rebalance?dryrun=true&concurrent_partition_movements_per_broker=10&concurrent_leader_movements=500"   If it will help you then please click on ”Accept as Solution" below this post.   Thank you. ... View more

@DataMike Has the reply helped resolve your issue? If so, please mark the appropriate reply as the solution, as it will make it easier for others to find the answer in the future. Thanks! ... View more

Thanks for checking @StevenOD  (sorry for posting that last post under a different account - forgot who I was logged in as). ... View more

Hi @DataMike, Yes, once CM is down, you can't update the configuration unless you "hack" into CM's backend database, which is also down in our scenario. So if you setup MySQL in such a way that CM will connect to LB / VIP host, which will route to the MySQL host that you want to, so in the event of one MySQL instance is down, simply update LB to only go to the working one. This avoids the needs to update the CM config. Hope that can help. Cheers Eric ... View more

It would be safe if you remove balancer role. balancer is required only when there is data incosistency.stop the role and follow below steps. You can goto HDFS-> instances -> select balancer -> migrate roles and specify target host.   Regards, Asim   ... View more

@DataMike,   That should be OK.  You can consider what to do with the other roles afterward.  Just note that if the impalad or regionserver are used for anything, they will need to read/write to a remote DataNode and they will also be competing with the movement of blocks from the decomissioned dn to a new one. ... View more