Reidddddd edited a comment on issue #468: HBASE-22822 : Un/Re-schedule balancer 
chore with balance_switch
URL: https://github.com/apache/hbase/pull/468#issuecomment-520290804
 
 
   IIRC, `gracefully_stop.sh` will turn balancer off, move regions, 
stop/restart RS, then turn balancer on.
   
   And there's one script `rolling_restart.sh` relying on `gracefully_stop.sh`, 
will repeat the mentioned process. If the RS number in rolling restart is large 
which is often the case in production env---hundreds at least, the master 
inside will cancel and remove task then construct a new task back and forth, at 
JVM level.
   
   One step back, current impl brings no harm to master nor good, but the new 
impl looks like may bring a new uncertainty.
   
   I incline to keep it still, and so, leave my -0.

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