Re: [ZODB-Dev] "MySQL server has gone away" with RelStorage
On Mon, Oct 25, 2010 at 05:53:05PM +0100, Chris Withers wrote: > On 25/10/2010 15:57, Paul Winkler wrote: > > On Sun, Oct 24, 2010 at 05:55:05PM +0100, Chris Withers wrote: > >> Restarting Zope appeared to fixed the problem, but I'm slightly confused > >> as I can't find any entries in the logs of the Apache instance that sits > >> in front of the test instances for the failed requests... > > > > Maybe turn on Zope's trace log? > > Okay, but regardless of what happens with Zope, surely I'd expect a row > in the Apache log saying what happened? Depends. If the user saw a 50x error page from the server, then yes. If the *browser* timed out before receiving a response, then maybe not. Like Zope, Apache doesn't put a line in the access log until it has finished processing the request and sent a response back. If Zope is more or less hung, and Apache has a long ProxyTimeout configured (I believe the result is 300 seconds), then you might not see anything logged. I am not sure what the default timeouts in various browsers would be, but my subjective impression is that it's lower than 300 seconds. That's why I suggested the trace log; you can see exactly what requests come in as they arrive, and whether & when a response gets sent back. -- Paul Winkler http://www.slinkp.com ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
Re: [ZODB-Dev] "MySQL server has gone away" with RelStorage
On 25/10/2010 15:57, Paul Winkler wrote: > On Sun, Oct 24, 2010 at 05:55:05PM +0100, Chris Withers wrote: >> Restarting Zope appeared to fixed the problem, but I'm slightly confused >> as I can't find any entries in the logs of the Apache instance that sits >> in front of the test instances for the failed requests... > > Maybe turn on Zope's trace log? Okay, but regardless of what happens with Zope, surely I'd expect a row in the Apache log saying what happened? I'm just wondering whether I should be suspicious of MySQL + RelStorage + Zope or if I should be looking for some weird Apache issue... Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
Re: [ZODB-Dev] "MySQL server has gone away" with RelStorage
On Sun, Oct 24, 2010 at 05:55:05PM +0100, Chris Withers wrote: > Restarting Zope appeared to fixed the problem, but I'm slightly confused > as I can't find any entries in the logs of the Apache instance that sits > in front of the test instances for the failed requests... Maybe turn on Zope's trace log? -- Paul Winkler http://www.slinkp.com ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
Re: [ZODB-Dev] "MySQL server has gone away" with RelStorage
On 23/10/2010 18:48, Shane Hathaway wrote: > On 10/23/2010 01:29 AM, Chris Withers wrote: >> Hi Shane, >> >> With the server I'm testing on, when coming back to test after a couple >> of days working on something else, I get the following logged at Warning: >> >> Reconnecting load_conn: (2006, 'MySQL server has gone away') >> >> Does this mean the reconnection is being handled by RelStorage or that I >> need to do some work? > > That just means MySQL is timing out connections, which is fine. That > message was probably followed immediately by an info message saying that > it reconnected. Yep, that matches. >> Also, after this, it seems life the ZODB object cache is emptied. >> Is that happening or is it just my imagination? > > That's possible, but reconnection alone should not cause it. What could cause a cache to empty like this? More worryingly, another of the test sites (these sites only get hit in patches every few days when people come to do test runs) just timed out this morning. I can't see any evidence of the timed out requests in either the access log nor anything in the event log. Restarting Zope appeared to fixed the problem, but I'm slightly confused as I can't find any entries in the logs of the Apache instance that sits in front of the test instances for the failed requests... Has anyone seen anything like this? cheers. Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
Re: [ZODB-Dev] "MySQL server has gone away" with RelStorage
On 10/23/2010 01:29 AM, Chris Withers wrote: > Hi Shane, > > With the server I'm testing on, when coming back to test after a couple > of days working on something else, I get the following logged at Warning: > > Reconnecting load_conn: (2006, 'MySQL server has gone away') > > Does this mean the reconnection is being handled by RelStorage or that I > need to do some work? That just means MySQL is timing out connections, which is fine. That message was probably followed immediately by an info message saying that it reconnected. > Also, after this, it seems life the ZODB object cache is emptied. > Is that happening or is it just my imagination? That's possible, but reconnection alone should not cause it. Shane ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
[ZODB-Dev] "MySQL server has gone away" with RelStorage
Hi Shane, With the server I'm testing on, when coming back to test after a couple of days working on something else, I get the following logged at Warning: Reconnecting load_conn: (2006, 'MySQL server has gone away') Does this mean the reconnection is being handled by RelStorage or that I need to do some work? Also, after this, it seems life the ZODB object cache is emptied. Is that happening or is it just my imagination? cheers, Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
