private String findNewMaster(
Map<String, LiveInstance> liveInstancesMap,
Map<String, InstanceConfig> instanceConfigs,
String prevMasterHost,
Set<String> slaveSet) {
String newMaster = null;
SlaveStatus slaveStatusOfNewMaster = null;
for (String slave : slaveSet) {
if (liveInstancesMap.containsKey(slave) && instanceConfigs.get(slave).getInstanceEnabled()) {
MySQLAdmin admin = new MySQLAdmin(instanceConfigs.get(slave));
SlaveStatus slaveStatus = admin.getSlaveStatus();
if (slaveStatus != null) {
String masterHost = slaveStatus.getString(SlaveStatusAttribute.Master_Host);
String masterPort = slaveStatus.getString(SlaveStatusAttribute.Master_Port);
String slaveIOStatus = slaveStatus.getString(SlaveStatusAttribute.Slave_IO_Running);
String slaveSQLStatus = slaveStatus.getString(SlaveStatusAttribute.Slave_SQL_Running);
String masterLogFile = slaveStatus.getString(SlaveStatusAttribute.Master_Log_File);
int readMasterLogPos = slaveStatus.getInt(SlaveStatusAttribute.Read_Master_Log_Pos);
if ((masterHost + "_" + masterPort).equals(prevMasterHost)
&& "YES".equalsIgnoreCase(slaveIOStatus)
&& "YES".equalsIgnoreCase(slaveSQLStatus)) {
if (newMaster == null) {
newMaster = slave;
slaveStatusOfNewMaster = slaveStatus;
} else {
boolean isThisSlaveAhead =
masterLogFile.compareTo(
slaveStatusOfNewMaster.getString(
SlaveStatusAttribute.Master_Log_File))
> 0
&& readMasterLogPos
> slaveStatusOfNewMaster.getInt(SlaveStatusAttribute.Read_Master_Log_Pos);
if (isThisSlaveAhead) {
newMaster = slave;
slaveStatusOfNewMaster = slaveStatus;
}
}
}
}
}
}
return newMaster;
}
