[pgpool-hackers: 4440] Re: Guard against ill mannered frontend

[Tatsuo Ishii]

> So my proposal is, guarding against such a ill-mannerd message
> sequence and throwing an error to terminate the session if such
> messages are recieved.
> 
> Here are details of the proposal:
> 
> 1) add a switch to turn on the "safe guard". This implies that the
>    feature is only implemented on master branch. Others may argue that
>    this should be back-patched.
> 
> 2) if such a violation is detected, raise an error and terminate the
>    session. Continuing the session will be better but it's hard to
>    implement and I think it's not worth the trouble.

Regarding #1, I started to think that creating a new switch does not
make much sense. If the switch is off, a session could hang which is
the worst experience for users. So it seems there's no choice other
than turning on the switch. If the switch is always on, why we need
the switch?

I am going to commit only #2 part.

Best reagards,
--
Tatsuo Ishii
SRA OSS LLC
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp