[Pacemaker] [Problem] lrmd detects monitor time-out by revision of the system time.

[Andrew Beekhof]

On 10 Sep 2014, at 2:48 pm, renayama19661014 at ybb.ne.jp wrote:

> Hi Andrew,
> 
> I confirmed it in various ways.
> 
> The conclusion varies in movement by a version of glib.
>  * The problem occurs in RHEL6.x.
>  * The problem does not occur in RHEL7.0.
> 
> And this problem is solved in glib of a new version.
> 
> A change of next glib seems to solve a problem in a new version.
>  * https://github.com/GNOME/glib/commit/91113a8aeea40cc2d7dda65b09537980bb602a06#diff-fc9b4bb280a13f8e51c51b434e7d26fd
> 
> Many users expect right movement in old glib.
>  * Till it shifts to RHEL7...
> 
> Do you not make modifications in Pacemaker to support an old version?
>  * Model it on old G_xxxx() function.

I'll file a bug against glib on RHEL6 so that it gets fixed there.
Can you send me your simple reproducer program?

> 
> Best Regards,
> Hideo Yamauchi.
> 
> 
> 
> ----- Original Message -----
>> From: Andrew Beekhof <andrew at beekhof.net>
>> To: renayama19661014 at ybb.ne.jp
>> Cc: The Pacemaker cluster resource manager <pacemaker at oss.clusterlabs.org>
>> Date: 2014/9/8, Mon 19:55
>> Subject: Re: [Pacemaker] [Problem] lrmd detects monitor time-out by revision of the system time.
>> 
>> 
>> On 8 Sep 2014, at 7:12 pm, renayama19661014 at ybb.ne.jp wrote:
>> 
>>> Hi Andrew,
>>> 
>>>>>>> I confirmed some problems, but seem to be caused by the 
>> fact that 
>>> 
>>>> an event 
>>>>>> occurs somehow or other in g_main_loop of lrmd in the period 
>> when it is 
>>>> shorter 
>>>>>> than a monitor.
>>>>>> 
>>>>>> So if you create a trivial program with g_main_loop and a 
>> timer, and 
>>>> then change 
>>>>>> the system time, does the timer expire early?
>>>>> 
>>>>> Yes.
>>>> 
>>>> That sounds like a glib bug. Ideally we'd get it fixed there rather 
>> than 
>>>> work-around it in pacemaker.
>>>> Have you spoken to them at all?
>>>> 
>>> 
>>> 
>>> No.
>>> I investigate glib library a little more.
>>> And I talk with community of glib.
>>> 
>>> I may talk again afterwards.
>> 
>> Cool. I somewhat expect them to say "working as designed".
>> Which would be unfortunate, but it shouldn't be too hard to work around.
>> 

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