Timeout for asynchronous replication Re: Timeout and wait-forever in sync rep

On Mon, Dec 6, 2010 at 3:42 PM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
> On Fri, Oct 15, 2010 at 9:41 PM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>> The timeout doesn't oppose to 'wait-forever'. Even if you choose 'wait
>> -forever' (i.e., you set allow_standalone_master to false), the master
>> should detect the standby crash as soon as possible by using the
>> timeout. For example, imagine that max_wal_senders is set to one and
>> the master cannot detect the standby crash because of absence of the
>> timeout. In this case, even if you start new standby, it will not be
>> able to connect to the master since there is no free walsender slot.
>> As the result, the master actually waits forever.
>
> This occurred to me that the timeout would be required even for
> asynchronous streaming replication. So, how about implementing the
> replication timeout feature before synchronous replication itself?

Here is the patch. This is one of features required for synchronous
replication, so I added this into current CF as a part of synchronous
replication.

Regards,

--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center