Increase Ambari server cache size

Increase the Amabari Server cache size to accommodate a large number of hosts.

1. Calculate a new, larger cache size, using the following relationship:
   ecCacheSizeValue=60*[CLUSTER_SIZE]
   Where [CLUSTER_SIZE] is the number of nodes in the cluster.
2. On the Ambari Server host, in /etc/ambari-server/conf/ambari-properties, add the following property and value:
   server.ecCacheSize=[EC_CACHE_SIZE_VALUE]
   where [EC_CACHE_SIZE_VALUE] is the value calculated in the previous step, based on the number of nodes in the cluster.