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From GOMEZ Henri <hgo...@slib.fr>
Subject RE: Error ajp13_process_callback - write failed
Date Thu, 08 Nov 2001 11:30:08 GMT
>This time Tomcat crashed, I received some errors...  Is it possible to 
>receive this kind of error in mod_jk.log if Tomcat can't open up any 
>more files?
>
> >>> [Mon Nov 05 06:41:41 2001]  [jk_ajp13_worker.c (381)]: Error
> >>> ajp13_process_callback - write failed
> >>> [Mon Nov 05 06:41:58 2001]  [jk_ajp13_worker.c (381)]: Error
> >>> ajp13_process_callback - write failed
> >>> [Mon Nov 05 07:19:23 2001]  [jk_ajp13_worker.c (381)]: Error
> >>> ajp13_process_callback - write failed
>
>Tomcat would just hang and not serve any more requests.  I couldn't 
>connect to it directly either via port 8080.
>
>Looking through the logs, this time I noticed I'm getting "too many 
>files open" error in my application, so I carefully went through and 
>found some instances where files where being opened but not 
>closed.  How 
>does Java work, if you exit a method will it automatically close the 
>file, or does it wait for the garbage collector to do this?  I found 
>some instances where some servlets didn't explicitly close the 
>java.io.Writer from the HttpServletResponse class.
>
>I suppose maybe my application is eating up all the available file 
>pointers in memory and tomcat just hung trying to open a file? 
> Is this 
>a plausible theory?

Good point !!!!

On Linux, everything is file descriptor, sockets, file, pipe.
And there is a limit by user process, so the problem could 
be that one. You could use lsof to know how many descriptor
are in used for that application (tomcat + webapp) :)

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