If error handling, or something else, get into a recursive loop, it can eat up all available memory and result in symptoms like this.
Cheers, Larry > -----Original Message----- > From: M. Serrano [mailto:[EMAIL PROTECTED]] > Sent: Friday, May 10, 2002 1:18 PM > To: [EMAIL PROTECTED] > Subject: Re: mod_jk performance optimization > > > Thanx for your reply, for it really helped. > I used jk from 3.3 and the previous error which appeard at > mod_jk.log is > gone. :-) > But...(there's always a but) another error appears when I > request several > servlet tasks simultaneously. In mod_jk.log: > > [jk_ajp13_worker.c (381)]: Error ajp13_process_callback - write failed > > I've also checked tomcat.log and the following error appears: > > Ctx( /WebApplication ): Exception in: R( /WebApplication + > /servlet/ServletObj + null) - java.lang.OutOfMemoryError > <<no stack trace available>> > > After this the system is slower than ever. I tried to restart > Tomcat but the > system continues to be very...very slow. > > I'd appreciate if some clues about this problem could be thrown > at me :-) > > Thanx. > Serrano. > > >From: <[EMAIL PROTECTED]> > >Reply-To: "Tomcat Users List" <[EMAIL PROTECTED]> > >To: Tomcat Users List <[EMAIL PROTECTED]> > >Subject: Re: mod_jk performance optimization > >Date: Thu, 2 May 2002 10:04:13 -0700 (PDT) > > > >On Thu, 2 May 2002, M. Serrano wrote: > > > > > Hi. > > > > > > I've got installed in my box Linux, Apache 1.3.19, JDK > 1.3.1 and TC > >3.3.1 > > > working with ajp13. The following error appeard in my > mod_jk.log after a > >bit > > > of continuous utilisation: > > > > > > [jk_ajp13_worker.c (203)]: connection_tcp_get_message: Error - > > > jk_tcp_socket_recvfull failed > > > [jk_ajp13_worker.c (621)]: Error reading request > > > >From the line numbers, you may use an older version of jk, > try updating > >from CVS head first ( the bug may be already fixed ) ( you > can use either > >the 'frozen' jk from 3.3 or j-t-c ). > > > >The error message means from some reasons tomcat didn't sent back any > >content - so you may need to look in tomcat's lots as well. > > > >( the 'reading request' means the request from tomcat to jk to send a > >chunk of data ) > > > >Costin > > > > > > > > After analysing the server's config files and reading > some threads, I > > > concluded that the problem might be resolved through a > bit of extra > > > re-configuration. Although the problem appearence was > delayed, it still > > > existed. > > > > > > I wonder if anyone out there could help me with this subject. I'm > >sending in > > > attach some lines of httpd.conf, server.xml and mod_jk.conf > > > > > > Thanx a lot for your time. > > > Serrano. > > > > > > ## > > > ## httpd.conf -- Apache HTTP server configuration file > > > ## > > > > > > # > > > # Timeout: The number of seconds before receives and > sends time out. > > > # > > > Timeout 300 > > > > > > # > > > # KeepAlive: Whether or not to allow persistent > connections (more than > > > # one request per connection). Set to "Off" to deactivate. > > > # > > > KeepAlive On > > > > > > # > > > # MaxKeepAliveRequests: The maximum number of requests to allow > > > # during a persistent connection. Set to 0 to allow an > unlimited amount. > > > # We recommend you leave this number high, for maximum > performance. > > > # > > > MaxKeepAliveRequests 100 > > > > > > # > > > # KeepAliveTimeout: Number of seconds to wait for the > next request from > >the > > > # same client on the same connection. > > > # > > > KeepAliveTimeout 15 > > > > > > # > > > # Server-pool size regulation. Rather than making you > guess how many > > > # server processes you need, Apache dynamically adapts to > the load it > > > # sees --- that is, it tries to maintain enough server > processes to > > > # handle the current load, plus a few spare servers to > handle transient > > > # load spikes (e.g., multiple simultaneous requests from a single > > > # Netscape browser). > > > # > > > # It does this by periodically checking how many servers > are waiting > > > # for a request. If there are fewer than > MinSpareServers, it creates > > > # a new spare. If there are more than MaxSpareServers, > some of the > > > # spares die off. The default values are probably OK for > most sites. > > > # > > > MinSpareServers 5 > > > MaxSpareServers 10 > > > > > > # > > > # Number of servers to start initially --- should be a reasonable > >ballpark > > > # figure. > > > # > > > StartServers 8 > > > > > > # > > > # Limit on total number of servers running, i.e., limit > on the number > > > # of clients who can simultaneously connect --- if this > limit is ever > > > # reached, clients will be LOCKED OUT, so it should NOT > BE SET TOO LOW. > > > # It is intended mainly as a brake to keep a runaway > server from taking > > > # the system with it as it spirals down... > > > # > > > MaxClients 150 > > > > > > # > > > # MaxRequestsPerChild: the number of requests each child > process is > > > # allowed to process before the child dies. The child > will exit so > > > # as to avoid problems after prolonged use when Apache > (and maybe the > > > # libraries it uses) leak memory or other resources. On > most systems, > >this > > > # isn't really needed, but a few (such as Solaris) do > have notable leaks > > > # in the libraries. For these platforms, set to something > like 10000 > > > # or so; a setting of 0 means unlimited. > > > # > > > # NOTE: This value does not include keepalive requests > after the initial > > > # request per connection. For example, if a child > process handles > > > # an initial request and 10 subsequent "keptalive" > requests, it > > > # would only count as 1 request towards this limit. > > > # > > > MaxRequestsPerChild 200 > > > > > > # > > > # DocumentRoot: The directory out of which you will serve your > > > # documents. By default, all requests are taken from this > directory, but > > > # symbolic links and aliases may be used to point to > other locations. > > > # > > > DocumentRoot /usr/local/jakarta-tomcat-3.3.1/webapps/ROOT > > > > > > # This should be changed to whatever you set DocumentRoot to. > > > # > > > <Directory "/usr/local/jakarta-tomcat-3.3.1/webapps/ROOT"> > > > > > > # > > > # This may also be "None", "All", or any combination of "Indexes", > > > # "Includes", "FollowSymLinks", "ExecCGI", or "MultiViews". > > > # > > > # Note that "MultiViews" must be named *explicitly* --- > "Options All" > > > # doesn't give it to you. > > > # > > > Options indexes includes followSymLinks > > > > > > # > > > # This controls which options the .htaccess files in > directories can > > > # override. Can also be "All", or any combination of "Options", > >"FileInfo", > > > # "AuthConfig", and "Limit" > > > # > > > AllowOverride None > > > > > > # > > > # Controls who can get stuff from this server. > > > # > > > Order allow,deny > > > Allow from all > > > </Directory> > > > > > > # Include TOMCAT > > > Include > /usr/local/jakarta-tomcat-3.3.1/conf/auto/mod_jk.conf-local > > > > > > > > > > > > ----------------- mod_jk.conf-local ----------------- > > > > > > > > > ########## Auto generated on Tue Apr 30 11:47:40 WEST > 2002########## > > > > > > <IfModule !mod_jk.c> > > > LoadModule jk_module libexec/mod_jk.so > > > AddModule mod_jk.c > > > </IfModule> > > > > > > JkWorkersFile > >"/usr/local/jakarta-tomcat-3.3.1/conf/jk/workers.properties" > > > JkLogFile "/usr/local/jakarta-tomcat-3.3.1/logs/mod_jk.log" > > > > > > JkLogLevel error > > > > > > > > > > > > #################### /WebApplication #################### > > > > > > # Static files > > > Alias /WebApplication > > > "/usr/local/jakarta-tomcat-3.3.1/webapps/WebApplication" > > > > > > <Directory > "/usr/local/jakarta-tomcat-3.3.1/webapps/WebApplication"> > > > Options Indexes FollowSymLinks > > > DirectoryIndex index.jsp index.html index.htm > > > </Directory> > > > > > > > > > # Deny direct access to WEB-INF and META-INF > > > # > > > <Location "/WebApplication/WEB-INF/*"> > > > AllowOverride None > > > deny from all > > > </Location> > > > > > > <Location "/WebApplication/META-INF/*"> > > > AllowOverride None > > > deny from all > > > </Location> > > > > > > JkMount /WebApplication/servlet ajp13 > > > JkMount /WebApplication/servlet/* ajp13 > > > JkMount /WebApplication/*.jsp ajp13 > > > > > > #################### / #################### > > > > > > # Be sure to update DocumentRoot > > > # to point to: "/usr/local/jakarta-tomcat-3.3.1/webapps/ROOT" > > > <Directory "/usr/local/jakarta-tomcat-3.3.1/webapps/ROOT"> > > > Options Indexes FollowSymLinks > > > DirectoryIndex index.jsp index.html index.htm > > > </Directory> > > > > > > > > > # Deny direct access to WEB-INF and META-INF > > > # > > > <Location "/WEB-INF/*"> > > > AllowOverride None > > > deny from all > > > </Location> > > > > > > <Location "/META-INF/*"> > > > AllowOverride None > > > deny from all > > > </Location> > > > > > > JkMount /servlet ajp13 > > > JkMount /servlet/* ajp13 > > > JkMount /*.jsp ajp13 > > > > > > > > > ------ server.xml ------ > > > . > > > . > > > . > > > <ApacheConfig forwardAll="false" noRoot="false" > >jkDebug="error"/> > > > <IISConfig noRoot="false" /> > > > <NSConfig noRoot="false" /> > > > > > > <!-- ==================== Connectors ==================== --> > > > > > > <Http10Connector port="8080" > > > secure="false" > > > maxThreads="200" > > > maxSpareThreads="50" > > > minSpareThreads="10" /> > > > > > > <Ajp12Connector port="8007" /> > > > > > > <Ajp13Connector port="8009" > > > maxThreads="300" > > > maxSpareThreads="100" > > > minSpareThreads="10" /> > > > . > > > . > > > . > > > > > > _________________________________________________________________ > > > MSN Photos is the easiest way to share and print your photos: > > > http://photos.msn.com/support/worldwide.aspx > > > > > > > > > -- > > > To unsubscribe: > <mailto:tomcat-user-> [EMAIL PROTECTED]> > > > For > additional commands: > <mailto:[EMAIL PROTECTED]> > > > Troubles with the list: > <mailto:[EMAIL PROTECTED]> > > > > > > > > > > > >-- > > >To unsubscribe: <mailto:[EMAIL PROTECTED]> > >For additional commands: <mailto:[EMAIL PROTECTED]> > >Troubles with the list: <mailto:[EMAIL PROTECTED]> > > > > > _________________________________________________________________ > Chat with friends online, try MSN Messenger: http://messenger.msn.com > > > -- > To unsubscribe, e-mail: > <mailto:tomcat-user-> [EMAIL PROTECTED]> > For > additional commands, > e-mail: <mailto:[EMAIL PROTECTED]> > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
