How to shorten the time after data node switchover

[XIELEI YANG]

Host A, a management node, data node and SQL node. The main data node.
Host B, a management node, data node and SQL node.

Reboot host A.
Host B accessing mysql reports error ERROR 1296 (HY000): Got error 4009 'Cluster Failure' from NDBCLUSTER
Wait about 40s for normal access.


/usr/local/app/mysql-cluster/config.ini
[tcp default]
SendBufferMemory=2M
ReceiveBufferMemory=2M

[ndbd default]
NoOfReplicas=2 ## data num
DataMemory=2048M
IndexMemory=640M

LockPagesInMainMemory=1
NoOfFragmentLogFiles=300
SchedulerSpinTimer=400
SchedulerExecutionTimer=100
RealTimeScheduler=1
TimeBetweenGlobalCheckpoints=1000
TimeBetweenEpochs=200
RedoBuffer=32M
TimeBetweenLocalCheckpoints=6

MaxNoOfOrderedIndexes=512
MaxNoOfConcurrentOperations=100000

## mng
[ndb_mgmd]
NodeId=1
hostname=10.188.68.45
datadir=/usr/local/app/mysql-cluster/

[ndb_mgmd]
NodeId=2
hostname=10.188.68.46
datadir=/usr/local/app/mysql-cluster/


## data
[ndbd]
NodeId=11
hostname=10.188.68.45
datadir=/usr/local/app/mysql/data
StopOnError=0
StartPartialTimeout=1000
StartPartitionedTimeout=1000
TransactionDeadLockDetectionTimeOut=60000
[ndbd]
NodeId=12
hostname=10.188.68.46
datadir=/usr/local/app/mysql/data
StopOnError=0
StartPartialTimeout=1000
StartPartitionedTimeout=1000
TransactionDeadLockDetectionTimeOut=60000

## sql
[mysqld]
NodeId=21
hostname=10.188.68.45
[mysqld]
NodeId=22
hostname=10.188.68.46
[mysqld]

[mysqld]