Re: Fully-automatic streaming replication failover when master dies?

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От Dmitry Koterov
Тема Re: Fully-automatic streaming replication failover when master dies?
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Msg-id CA+CZih4-nZHesC9UtzPsVvUFyTHRE7L110Xi_DqnXVCT7=7iGQ@mail.gmail.com
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Ответ на Re: Fully-automatic streaming replication failover when master dies?  (John R Pierce <pierce@hogranch.com>)
Ответы Re: Fully-automatic streaming replication failover when master dies?
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It's even more tricky if it's not well-covered by automated tests, I suppose. :-) There could be a number of methods to forbid the master to rise up from the grave, e.g. voting quorum (or the simplest, but less elegant, solution - a centralized "witness" daemon who does all the work for all the machines). At least MongoDB does the work well, and with almost zero configuration.

My question was about a ready and well-tested solutions, do they exist.


On Thu, Jan 23, 2014 at 1:54 AM, John R Pierce <pierce@hogranch.com> wrote:
On 1/22/2014 1:35 PM, Dmitry Koterov wrote:

So does something similar and more-or-less stable exist for PostgrSQL too?


you'd need to implement that yourself using a cluster management package, and something like repmgr to handle the transitions.

database failover is extremely tricky stuff.  you have to make very very sure you don't get into a stoned cluster where both nodes THINK they are master.   most well implemented failover clusters make use of hardware 'fencing' to block the presumed-dead former master from coming back online without manual intervention.

--
john r pierce                                      37N 122W
somewhere on the middle of the left coast



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