Backup HMasters will go down if the zk connection expires without recovery

[Du, Jingcheng]

Dear Devs,

  Now I encounter a problem in the HMaster.
  Currently I run multiple HMasters in a cluster. If the ZK connection of one 
of the backup HMasters expires, this backup HMaster will go down directly 
without recovering the ZK connection.
I saw there were such code in the HMaster.abortNow() listed below, the 
fail.fast only works for active HMaster. Do the backup ones need to be 
recovered if the zk connection expires? Please advise. Thanks.

if (!this.isActiveMaster || this.stopped) {
      return true;
    }
boolean failFast = conf.getBoolean("fail.fast.expired.active.master", false);


Regards,
Jingcheng