[PATCH] Do not allow different versions of ctdb in a cluster

[Stefan Metzmacher]

Am 23.05.2017 um 09:09 schrieb Amitay Isaacs:
> On Tue, May 23, 2017 at 4:48 PM, Stefan Metzmacher <metze at samba.org> wrote:
> 
>> Hi Amitay,
>>
>> I guess there's no way to detect the version mismatch at the
>> "connect" time? Or is the keepalive message the first message
>> that's send over the connection?
>>
>> metze
>>
>>
> As soon as ctdb daemon starts up, it starts sending keepalive messages to
> the connected nodes every 5 seconds.  So strictly keepalive may not be the
> very first message sent to the other node, but keepalive messages will
> definitely be acted upon before the first recovery happens.  That is good
> enough for shutting down the node in case of version mismatch.
> 
> This is the smallest change I could think of to enable version checking
> without breaking backward compatibility for protocol.
> 
> In future, cluster daemon will implement the version check as part of the
> election process.  These will be the very first messages sent between the
> nodes.

Ok, thanks!

metze


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