a34358f0_e_Hadoop_2_7_1___YARN_Commands__Description
[COMMAND_OPTIONS] -transitionToStandby [–forcemanual] [Description] 
Transitions the service into Standby state. This command can not be used if automatic failover is enabled. Though you can override this by –forcemanual option, you need caution.
Apache Hadoop 2.7.1 – YARN Commands