graceful_stop.sh unable to restore the balance state

When executing the command ’graceful_stop.sh --restart --reload‘, the balance state cannot be restored normally. Because the related command returned the wrong result:

HBASE_BALANCER_STATE=$(echo 'balance_switch false' | hbase shell -n | tail -1)
echo ${HBASE_BALANCER_STATE} 
hbase:002:0>

The information returned by  "echo 'balance_switch false' | hbase shell -n" is as follows:

hbase:001:0> balance_switch false  #line 1

2022-08-05 22:41:57,269 INFO  [RPCClient-NioEventLoopGroup-1-1] Configuration.deprecation: hbase.client.pause.cqtbe is deprecated. Instead, use hbase.client.pause.server.overloaded #line 2
Previous balancer state : true   # line 3
Took 0.6787 seconds #line 4
=> true  #line 5
hbase:002:0> #line 6

head -1 is #line 1: "hbase:001:0> balance_switch false"

tail -1 is #line 6: "hbase:002:0>"

balance_switch.rb is as follows:

def command(enableDisable)
  prev_state = !!admin.balance_switch(enableDisable)
  formatter.row(["Previous balancer state : #{prev_state}"])
  prev_state
end

#line 3 and #line 5 of 'true'  represent the previous balance status.

So we can use the value of #line 5  as the state of the previous balance.