Re: Runnaway Trigger
This WebDNA talk-list message is from 2007
It keeps the original formatting.
numero = 68675
interpreted = N
texte = Matthew The phone admin sounds the go. Did you write a cut down system for the phone ? On 13 Mar 2007, at 9:54 AM, Matthew A Perosi wrote: > Interesting philosophy Donovan, I think I will rewrite all my > triggers that way! > > As for what I'm actually doing... This particular trigger is, I > think, one of my more creative and useful ones. It solves a > problem that SMI was incapable of solving to my satisfaction. > > I have 5 WebDNA servers. I got tired of having the WebCatEngines > turning themselves off for no reason, and then not realizing they > were off for half a day. So I created triggers on every server. > Every hour, on the half hour, each server runs a > serverstatcheck.tpl that [TCPConnect]s to it's neighbor. The > neighbor simply responds with "good" or it does not respond at > all. If it does not respond, then the server doing the check sends > me a text message to my cell phone. > > I am then able to log in through my cell phone web browser and > check error logs, restart WebCatalog or reboot the server. > So in worse case, none of my servers will be out of commission for > more than 59 minutes. What I find really strange is that most of > my WebCat failures happen between 1AM and 5AM. I'll also note that > since this neighbor checking system has been running (December > 2006) I've only had to restart WebCat on 3 of the servers. > > Since 1998 I've only had a few issues with triggers. I find them > to be rather stable on RedHat Linux. All of the other issues I had > were actually because of run time errors and my own bad coding. > But seeing the strange NextExecute time, I realize this is > something different. I'm wondering if perhaps there was a Timeout > issue, and then the Retry kicked in. > > But I don't know how to track down what might be causing the > Timeout/Retry. > Matthew Perosi > Psi Prime, Inc. > New Jersey > > Donovan Brooke wrote: > >> Jesse Proudman wrote: >> >>> From my experience, the easiest solution is to throw the trigger >>> away and switch to using wget or curl in a crontab. >>> >>> -- >> >> >> From my experience, the most stable solution is to use infallible >> code. >> Often enough, triggers are used in ways that cause problems or >> are used in ways that are not as stable as other methods. Matthew is >> describing one of these that, depending on his needs, I may suggest >> he change his philosophy a bit. However, first, I wanted to check his >> settings because they can be a PIA to troubleshoot if they are set >> wrong. I still make errors when setting triggers. >> >> >> Regarding the use of triggers, I'll speak in general terms because >> I don't really >> know what Matthew is testing for and what his test code is. However, >> I see many people use triggers as a way of executing code in a >> certain >> time frame. It is my experience that, instead of giving the job of >> "time keeper" to the trigger system, you give that job to the code >> instead. >> for example, ...Instead of hitting a page every hour, hit the page >> quite a >> few times per hour and have the code on that page decipher if its >> time to execute. >> This also protects against misc. hits. >> >> Donovan >> >> >> > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list
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Associated Messages, from the most recent to the oldest:
Matthew The phone admin sounds the go. Did you write a cut down system for the phone ? On 13 Mar 2007, at 9:54 AM, Matthew A Perosi wrote: > Interesting philosophy Donovan, I think I will rewrite all my > triggers that way! > > As for what I'm actually doing... This particular trigger is, I > think, one of my more creative and useful ones. It solves a > problem that SMI was incapable of solving to my satisfaction. > > I have 5 WebDNA servers. I got tired of having the WebCatEngines > turning themselves off for no reason, and then not realizing they > were off for half a day. So I created triggers on every server. > Every hour, on the half hour, each server runs a > serverstatcheck.tpl that [tcpconnect]s to it's neighbor. The > neighbor simply responds with "good" or it does not respond at > all. If it does not respond, then the server doing the check sends > me a text message to my cell phone. > > I am then able to log in through my cell phone web browser and > check error logs, restart WebCatalog or reboot the server. > So in worse case, none of my servers will be out of commission for > more than 59 minutes. What I find really strange is that most of > my WebCat failures happen between 1AM and 5AM. I'll also note that > since this neighbor checking system has been running (December > 2006) I've only had to restart WebCat on 3 of the servers. > > Since 1998 I've only had a few issues with triggers. I find them > to be rather stable on RedHat Linux. All of the other issues I had > were actually because of run time errors and my own bad coding. > But seeing the strange NextExecute time, I realize this is > something different. I'm wondering if perhaps there was a Timeout > issue, and then the Retry kicked in. > > But I don't know how to track down what might be causing the > Timeout/Retry. > Matthew Perosi > Psi Prime, Inc. > New Jersey > > Donovan Brooke wrote: > >> Jesse Proudman wrote: >> >>> From my experience, the easiest solution is to throw the trigger >>> away and switch to using wget or curl in a crontab. >>> >>> -- >> >> >> From my experience, the most stable solution is to use infallible >> code. >> Often enough, triggers are used in ways that cause problems or >> are used in ways that are not as stable as other methods. Matthew is >> describing one of these that, depending on his needs, I may suggest >> he change his philosophy a bit. However, first, I wanted to check his >> settings because they can be a PIA to troubleshoot if they are set >> wrong. I still make errors when setting triggers. >> >> >> Regarding the use of triggers, I'll speak in general terms because >> I don't really >> know what Matthew is testing for and what his test code is. However, >> I see many people use triggers as a way of executing code in a >> certain >> time frame. It is my experience that, instead of giving the job of >> "time keeper" to the trigger system, you give that job to the code >> instead. >> for example, ...Instead of hitting a page every hour, hit the page >> quite a >> few times per hour and have the code on that page decipher if its >> time to execute. >> This also protects against misc. hits. >> >> Donovan >> >> >> > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > To switch to the DIGEST mode, E-mail to digest@talk.smithmicro.com> > Web Archive of this list is at: http://webdna.smithmicro.com/ ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Stuart Tremain
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