Ambari metrics collector down with "Encounter exception in sub plan[0] execution"

[#1]

My ambari metrics collector always goes down after running one or two days.

From the ambari metrics collector log, I find following message:

java.sql.SQLException: Encountered exception in a sub plan[0] execution

.....

caused by: java.sql.SQLException:Encountered exception in sub plan[0] execution

...

caused by java.sql.SQLException: java.util.concurrent.TimeoutException

at orig.apache.phoenix.cache.ServerCacheClient.addServerCache...

It seems be related to phoenix. But from hbase page on ambari, I have no phoenix server.

The mode is distributed.