Hi Chuck,
On 26 Feb 2014, at 22:26, Chuck Hill <ch...@global-village.net> wrote:
> Hi John,
>
> On 2/25/2014, 10:59 PM, "John Pollard" wrote:
>
> Thanks for the feedback, really useful. To try to stop the intermittent
> errors, I decided to restart wotaskd in this way:
>
> sudo /etc/init.d/webobjects restart &
>
> I think you can just kill it and let it get restarted automatically. I
> usually do this on OS X, but I think that init.d will do the same-ish thing.
I know this works on my Mac dev box, but I just tried it on a test deployment
server and it didn't restart after I killed it.
/etc/init.d/webobjects uses
ps aux | awk '/WOPort 1085/ && !/awk/ {print $2}'
to find the process and kills it
>
>
> Somehow this created a cycle of reported app deaths and restarts in
> JavaMonitior which I only discovered in the early hours, though I don't see a
> long trail of app log files, suggesting the restarts might not have been
> happening in reality, or logs couldn't be written.
>
> At first I thought more than one wotaskd was starting, but that can’t be as
> there would be a port conflict. Usually killing wotaskd and letting it
> restart is clean and does not result in issues like this.
>
>
>
> wotaskd and JavaMonitor run as appserver and I couldn't see a permissions
> problem either in SiteConfig.xml or for the app log files
>
> When a reboot resulted in the same problem (now really panic), I launched a
> replacement live app server from a recent baseline and that was ok
>
> That seems a little odd. What had changed between the two?
No change, it was a recent baseline. The only points were that:
- I had been seeing the intermittent: The requested application was not found
on this server.
- I had tried to restart with sudo /etc/init.d/webobjects restart &
(which I have subsequently shown seems to behave ok on another replicated
server)
>
>
> One thought, can this ever be a problem?.... a WO server needs to start say
> 20 apps which is a big load on the system, if too big a load, could wotaskd
> think the apps failed to start and get into a cycle of restarting. I don't
> think this is it, but a thought.
>
> Yes, that can happen. To mitigate this, set Time Allowed For Startup and
> check Phased Startup in the Application Settings section of the Application
> Config page.
Thanks, I do have Phased Startup and I have now doubled the startup times from
30 to 60, though I don't think this is it. The key thing seems to be that the
apps weren't even getting to the point of producing any log output.
You are so helpful Chuck, thank you.
John
>
>
> Chuck
>
>
>
> On 26 Feb 2014, at 00:07, Chuck Hill <ch...@global-village.net> wrote:
>
>> I usually set the apps to restart once a week. I never restart wotaskd.
>>
>> Chuck
>>
>> On 2/25/2014, 7:09 AM, "John Pollard" wrote:
>>
>> Do WO deployments / wotaskd need any occasional restarts scheduled? Our live
>> server uptime is currently 118 days.
>> Might a wotaskd restart help with the intermittent "The requested
>> application was not found on this server."?
>>
>> On 25 Feb 2014, at 11:50, John Pollard <j...@pollardweb.com> wrote:
>>
>> Over the past few weeks we have started to notice the occasional: "The
>> requested application was not found on this server."
>> From experimenting, am I right in thinking this is from the apache
>> WebObjects module, because I am able to trigger this by stopping wotaskd?
>> Why might the WebObjects apache module not be able to find wotaskd, very
>> occasionally, if this is what is happening?
>> The wotaskd we are running is a Wonder version from March 2013.
>> The deployment is on Amazon Linux. No shortage of ram on the box and running
>> a fairly light load e.g. 20,000 transactions a day across 6 app instances,
>> averaging about 0.05 seconds per request with many seconds idle between
>> request.
>> The WO apache module used is: /usr/lib64/httpd/modules/mod_WebObjects.so
>> -rwxr-xr-x 1 root root 395668 Apr 28 2011 mod_WebObjects.so
>> Apache version:
>> Server version: Apache/2.2.25 (Unix)
>> Server built: Jul 12 2013 01:00:05
>> Any pointers as to how to track down the intermittent error would be a boost!
>> Thanks
>> John
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