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:
https://issues.apache.org/jira/browse/AMBARI-13946 If your hdfs-site.xml contains the "non-HA properties" described in that issue, then a viable workaround would be to remove those properties. --Chris Nauroth From: Anu Engineer <aengin...@hortonworks.com<mailto:aengin...@hortonworks.com>> Date: Monday, January 4, 2016 at 3:47 PM To: Marcin Tustin <mtus...@handybook.com<mailto:mtus...@handybook.com>>, "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <user@hadoop.apache.org<mailto:user@hadoop.apache.org>> 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. Thanks Anu From: Marcin Tustin <mtus...@handybook.com<mailto:mtus...@handybook.com>> Date: Wednesday, December 30, 2015 at 4:32 PM To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <user@hadoop.apache.org<mailto:user@hadoop.apache.org>> Subject: Can't run rebalancer because it thinks another is running Hi, 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? Thanks, Marcin Want to work at Handy? Check out our culture deck and open roles<http://www.handy.com/careers> Latest news<http://www.handy.com/press> at Handy Handy just raised $50m<http://venturebeat.com/2015/11/02/on-demand-home-service-handy-raises-50m-in-round-led-by-fidelity/> led by Fidelity [http://marketing-email-assets.handybook.com/smalllogo.png]
