We ran into the same issue using Ambari 2.2.2.2.It stops at 35%.Says another instance is running and exiting. when you restart form Ambari or from the command line .Fix is :go to your name node run ps -aef|grep balancer kill -9 all the balancer process except the irq balancer (Linux native).Start the balancer from cmd line using # sudo -u hdfs hdfs balancer it works !!!
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