If this is an Ambari-managed cluster that was transitioned from non-HA to running in HA mode, then you might be interested in a known Ambari bug:
If your hdfs-site.xml contains the "non-HA properties" described in that issue, then a viable workaround would be to remove those properties.
From: Anu Engineer <[hidden email]>
Date: Monday, January 4, 2016 at 3:47 PM
To: Marcin Tustin <[hidden email]>, "[hidden email]" <[hidden email]>
Subject: Re: Can't run rebalancer because it thinks another is running
Balancer writes the hostname to a file called “/system/balancer.id” if you check that file you should be able to see where
the other balancer is running.
From: Marcin Tustin <[hidden email]>
Date: Wednesday, December 30, 2015 at 4:32 PM
To: "[hidden email]" <[hidden email]>
Subject: Can't run rebalancer because it thinks another is running
I'm running HDFS in HA mode. I can't run the rebalancer because I get this message:
java.io.IOException: Another Balancer is running.. Exiting ...
Dec 31, 2015 12:22:09 AM Balancing took 1.159 seconds
Any suggestions as to why that might be; and if it's the obvious that it's running elsewhere, how would I figure out where?
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