Обсуждение: external_pid_file not removed on postmaster exit
It seems strange that the external_pid_file is never removed. There is even a C comment about it: /* Should we remove the pid file on postmaster exit? */ I think it should be removed with proc_exit hook just like the main postmaster.pid file. Does anyone remember why this was not done originally or have any concerns?
>From: pgsql-hackers-owner@postgresql.org [pgsql-hackers-owner@postgresql.org] on behalf of Peter Eisentraut [peter_e@gmx.net] > Sent: Friday, July 27, 2012 10:39 AM > It seems strange that the external_pid_file is never removed. There is > even a C comment about it: > /* Should we remove the pid file on postmaster exit? */ > I think it should be removed with proc_exit hook just like the main > postmaster.pid file. external_pid_file is created first time when it is enabled in postgresql.conf I think it should be removed once the parameter external_pid_file is unset; Making handling of both postmaster.pid and external_pid_file same in terms of creation and removal may not be best choice as both have different purpose. With Regards, Amit Kapila.
Amit kapila <amit.kapila@huawei.com> writes:
>> I think it should be removed with proc_exit hook just like the main
>> postmaster.pid file.
> external_pid_file is created first time when it is enabled in postgresql.conf
> I think it should be removed once the parameter external_pid_file is unset;
Unset? If that parameter is not PGC_POSTMASTER, it certainly ought to
be. In any case, that has little to do with what Peter is complaining
about ...
regards, tom lane
> From: Tom Lane [tgl@sss.pgh.pa.us] > Sent: Saturday, July 28, 2012 9:46 PM Amit kapila <amit.kapila@huawei.com> writes: >>> I think it should be removed with proc_exit hook just like the main >>> postmaster.pid file. >> external_pid_file is created first time when it is enabled in postgresql.conf >> I think it should be removed once the parameter external_pid_file is unset; > Unset? By Unset, I mean to say when the configuration parameter 'external_pid_file' is disabled (#external_pid_file). But if the path/filename is changed to different name across restart of server, it will not be able to delete the previousfile. So it will not workout the way I was trying to think. However if it is deleted at proc_exit as suggested by Peter, there will be no problem. The reason why I have thought the file not to get deleted at every proc_exit, is a. Initially I thought it might be un-necessary to delete and re-create the file at server shutdown and start. b. I was not sure if this file has usage only till server is running. With Regards, Amit Kapila.
On Fri, 2012-07-27 at 08:09 +0300, Peter Eisentraut wrote: > It seems strange that the external_pid_file is never removed. There is > even a C comment about it: > > /* Should we remove the pid file on postmaster exit? */ > > I think it should be removed with proc_exit hook just like the main > postmaster.pid file. > > Does anyone remember why this was not done originally or have any > concerns? Since that was not the case, I propose the attached patch to unlink the external pid file.