Enabling AMS high availability

Make AMS highly available by switching AMS to distributed mode and adding a second, standby Metrics Collector.

Ambari installs the Ambari Metrics System (AMS) , into the cluster with a single Metrics Collector component by default. The Collector is a daemon that runs on a specific host in the cluster and receives data from the registered publishers, the Monitors and Sinks. Depending on your needs, you might require AMS to have two collectors to cover a High Availability scenario. Establishing AMS High Availability means having a standby collector take over in the event the primary collector fails.

You must deploy AMS in distributed, not embedded mode.

In Ambari Web, browse to the host where you would like to install another collector.
On the Host page, click +Add.
Click Metrics Collector from the +Add list.
Ambari installs the new Metrics Collector and configures Ambari Metrics for HA. The new Collector will be installed in a stopped state.
In Ambari Web > Components, start the new Collector component.

If you attempt to add a second Collector to the cluster without first switching AMS to distributed mode, the collector will install but will not be able to be started. To resolve this:

Delete the newly added Collector.
Enable distributed mode.
Then, re-add the Collector.

Traceback (most recent call last):
File 
 "/var/lib/ambari-agent/cache/common-services/AMBARI_METRICS/0.1.0/package/scripts/metrics_collector.py", line 150, in <module>
 AmsCollector().execute()
File
 "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 313, in execute
 method(env)
File
"/var/lib/ambari-agent/cache/common-services/AMBARI_METRICS/0.1.0/package/scripts/metrics_collector.py", line 48, in start self.configure(env, action = 'start') # for security
File
 "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 116, in locking_configure original_configure(obj, *args, **kw)
File
 "/var/lib/ambari-agent/cache/common-services/AMBARI_METRICS/0.1.0/package/scripts/metrics_collector.py", line 42, in configure raise
Fail("AMS in embedded mode cannot have more than 1 instance.
Delete all but 1 instances or switch to Distributed mode ") resource_management.core.exceptions.
Fail: AMS in embedded mode cannot have more than 1 instance.
Delete all but 1 instances or switch to Distributed mode