is it necessary for setting this parameter "secondary_check_script" in the one and same LAN ?

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In general, it is highly recommended to have two or more network routes to 
check MySQL master server availability.
secondary_check_script = masterha_secondary_check -s remote_host1 -s 
remote_host2

My question as follows:
If all my machine(mysql master,mysql slave ,MHA manager) are in the one and the 
same LAN , is it necessary for setting this parameter?

I think it is not necessary.
I have to make sure that remote_host1 and remote_host2 are alive ,if one is 
dead,at the same time the master node is dead ,MHA failover will not be 
successful because mha manager can not login the remote_host .

What is your opinion about it?

Original issue reported on code.google.com by [email protected] on 1 Aug 2014 at 3:07