Question-66: Which property you have to change, so that Ambari Web UI or REST API port can be changed?

Answer: We need to change the following property in the file /etc/ambari-server/conf/ambari.properties files, and Ambari server should be in the stop at that time.

Clinet.api.port=<New Port>

Question-67: If you have setup a 100-node cluster then which all are the options you should consider for tuning the Ambari server?

Answer: As bigger cluster generated more data and can cause the performance issues as well. So below are the important points you must remember for tuning the Ambari server itself.

• Need to increase the JVM memory settings based on the need.
• Increase the size of in-memory caches.
• We may have to increase the number of connections in the JDBC connection pools.
• Need to increase the timeout, because larger data volume can cause higher latency in the operations. So we need to increase the Wait timeout and interactive timeouts.

Question-68: Which file has the environment variables configuration details in Ambari server?

Answer: ambari-env.sh file is used to setup the environment variables. This is found under the /var/lib/ambari-server

Question-69: What are the recommended values for setting the cache size in the Ambari server?

Answer: usually you can calculate the cache size using the formula as below

newCacheSize=60*Number of nodes in the cluster.

And in the properties file, you can update following property with this value.

Server.ecCacheSize=newCacheSize

Question-70: Where you change the JDBC pool settings to support a greater number of nodes in the cluster?

Answer: It is again the same property file /etc/ambari-server/conf/ambari-properties file.