[pgpool-hackers: 1276] Re: pgpool zombie with wathdog 3.5

[Yugo Nagata]

Hi Usama, 

I write the patch to fix it. 

In current, escalation process is forked but not waited by watchdog
process. Fix is to wait the escalation process by waitpid. That is,
watchdog is blocked while waiting the escalation finishing.

Any comment?

Regards,

On Mon, 21 Dec 2015 16:46:33 +0900
Yugo Nagata <nagata at sraoss.co.jp> wrote:

> Usama,
> 
> A zombie process appeared after pgpool started with watchdog.
> 
> $ ps aux | grep pgpool
> ...
> yugo-n   32156  0.0  0.0  19880  1244 pts/27   S    16:31   0:00 pgpool: watchdog                                                                                                                                                                                                          
> yugo-n   32165  0.0  0.0      0     0 pts/27   Z    16:31   0:00 [pgpool] <defunct>
> yugo-n   32166  0.0  0.0  17792   768 pts/27   S    16:31   0:00 pgpool: lifecheck 
> ...
> 
> I found PID 32165 was pid of the escalation process.
> 
>  2015-12-21 16:31:33: pid 32156: LOG:  escalation process started with PID:32165
>  2015-12-21 16:31:33: pid 32165: LOG:  watchdog: escalation started
> 
> I can reproduce this on Ubuntu but not CentOS.
> 
> Regarads,
> -- 
> Yugo Nagata <nagata at sraoss.co.jp>
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-- 
Yugo Nagata <nagata at sraoss.co.jp>
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