Chapter 13. Tuning Ambari Performance

Calculate the new, larger cache size, using the following relationship:

ecCacheSizeValue=60*<cluster_size>

where <cluster_size> is the number of nodes in the cluster.

On the Ambari Server host, in /etc/ambari-server/conf/ambari-properties, add the following property and value:

server.ecCacheSize=<ecCacheSizeValue>

where <ecCacheSizeValue> is the value calculated previously, based on the number of nodes in the cluster.

Add the following properties to adjust the JDBC connection pool settings:

server.jdbc.connection-pool.acquisition-size=5

server.jdbc.connection-pool.max-age=0

server.jdbc.connection-pool.max-idle-time=14400

server.jdbc.connection-pool.max-idle-time-excess=0

server.jdbc.connection-pool.idle-test-interval=7200

If using MySQL as the Ambari database, in your MSQL configuration, increase the wait_timeout and interacitve_timeout to 8 hours (28800) and max. connections from 32 to 128.

Important

It is critical that the Ambari configuration for server.jdbc.connection-pool.max-idle-time and server.jdbc.connection-pool.idle-test-interval must be lower than the MySQL wait_timeout and interactive_timeout set on the MySQL side. If you choose to decrease these timeout values, adjust downserver.jdbc.connection-pool.max-idle-time and server.jdbc.connection-pool.idle-test-interval accordingly in the Ambari configuration so that they are less than wait_timeout and interactive_timeout.

Restart Ambari Server.

ambari-server restart

If you are using the Ambari Metrics service, you might want to consider switching from the default embedded mode to distributed mode, as well as other tuning options. See Configuring and Tuning Ambari Metrics for more information.