@kiranps11    Did you add and start a "DistributedMapCacheServer" controller service running on port 4557? The "DistributedMapCacheClientService" controller service only creates a client that is used to connect to a server you must also create.  Keep in mind that the DistributedMapCacheServer does not offer High Availability (HA). Enabling this controller services will start a DistributedMapCacheServer on each node in your NiFi cluster, but each of those servers do not talk to each other.  This is important to understand since you have configured your DMC Client to use localhost.  This means that each node in your cluster would be using its own DMC server rather than a single DMC server. For a HA solution you should be using an external map cache via one of the other client offerings like "HBase_2_ClientMapCacheService " or "RedisDistributedMapCacheClientService", but this would require you to setup that external HBAs or Redis server with HA yourself. Hope this helps, Matt ... View more