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[Bug 1323521] remote operation of pmie based pmda restarter interferes w

To: pcp@xxxxxxxxxxx
Subject: [Bug 1323521] remote operation of pmie based pmda restarter interferes with local pmcd
From: bugzilla@xxxxxxxxxx
Date: Mon, 04 Apr 2016 00:39:41 +0000
Auto-submitted: auto-generated
Delivered-to: pcp@xxxxxxxxxxx
In-reply-to: <bug-1323521-355098@xxxxxxxxxxxxxxxxxxx>
References: <bug-1323521-355098@xxxxxxxxxxxxxxxxxxx>
https://bugzilla.redhat.com/show_bug.cgi?id=1323521

Nathan Scott <nathans@xxxxxxxxxx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |CLOSED
         Resolution|---                         |WONTFIX
        Last Closed|                            |2016-04-03 20:39:41



--- Comment #1 from Nathan Scott <nathans@xxxxxxxxxx> ---
There's really no reason to worry about this.  Yes, we can end up signaling the
local pmcd when a remote pmda fails.  We could workaround this, by adding
knowledge to pmieconf about local pmcd vs not when generating config files -
but its not worth it just for this rule.  If we add more localhost-only rules,
sure, lets look into it.

Signaling pmcd does not cause any problems, and is a very lightweight operation
when no work needs to be done.  There is no reason not to run a local pmie on
every host where there is concern about pmda/domain-induced timeouts.

It only happens once in a blue moon (in the relatively unlikely case where a
pmda has failed, and people are using only the default-generated rulesets with
remote hosts - these can be overridden if there was a genuine concern / actual
issue here).

> (I remain convinced that pmda restarting ought to be performed by logic 
> within > the local pmcd, and not require external imperfect assistance.)

That's nice.  Please send through the code implementing this & lets see if it
can be made to work as reliably, and how much complexity it adds.

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