Re: Bug in tomcat scripts?
- Mensaje original De: Christopher Schultz [EMAIL PROTECTED] Para: Tomcat Users List users@tomcat.apache.org Enviado: martes, 12 de agosto, 2008 19:30:51 Asunto: Re: Bug in tomcat scripts? -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Enrique, Enrique Arizón wrote: | # rm -rf $(cwd)/.. /etc/init.d/tomcat5 restart Does this seem like a good idea to you? Hmm... I added 'rm -rf' to my script and now I can't find any files! The use case was more complex actually. My tomcat app keeps some data in the .../webapp/MyApp directory. During unit tests I remove MyApp, redeploy it after compiling and restart tomcat. (Not such an unusual scenario). The case is that the remove redeploy restart is executed in a shell script, and if suddenly I execute it while in webapp/MyApp tomcat is destroyed. I can't imagine that this has anything to do with the scripts that ship with any version of Tomcat. Maybe you could post the entire script and we can figure out why you might want to delete an entire directory tree just for the heck of it. - -chris After browsing the scripts it looks to be related with the makeHomeDir() function in the Mandriva /etc/init.d/tomcat5 script. (I attach the file in case you are interested). Regards, Enrique -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkihyMsACgkQ9CaO5/Lv0PCjfACggbCbf7ERUoJX0aYw59bhY7Qx TRMAn2pLYxOQQMOnKRwHPZlKdhir6XeS =wjpc -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Bug in tomcat scripts?
I suddenly removed my cwd just prior to start tomcat. Briefly, the script would be similar to: # rm -rf $(cwd)/.. /etc/init.d/tomcat5 restart after which I got lot of errors and tomcat broke (broke == I reinstalled the rpm package to make it work again). The worst thing is that after the first run of the suicide command when executing: # /etc/init.d/tomcat5 start doesn't work but doesn't display any errors and returns OK. The error list is similar to: shell-init: error retrieving current directory: getcwd: cannot access parent directories: No existe el fichero o el directorio Deteniendo tomcat5: [ OK ] Iniciando tomcat5: shell-init: error retrieving current directory: getcwd: cannot access parent directories: File or directory doesn't exists. shell-init: error retrieving current directory: getcwd: cannot access parent directories: File or directory doesn't exists. pushd: error retrieving current directory: getcwd: cannot access parent directories: File or directory doesn't exists. /bin/ln: creating symbolic link «[commons-collections-tomcat5].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[commons-dbcp-tomcat5].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[commons-el].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[commons-pool-tomcat5].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[ecj].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[jaf].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[jasper5-compiler].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[jasper5-runtime].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[javamail].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[jsp].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[servlet].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[tomcat5][naming-factory].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[tomcat5][naming-resources].jar»: File or directory doesn't exists. /usr/share/java-utils/java-functions: line 247: popd: directory stack empty shell-init: error retrieving current directory: getcwd: cannot access parent directories: File or directory doesn't exists. pushd: error retrieving current directory: getcwd: cannot access parent directories: File or directory doesn't exists. /bin/ln: creating symbolic link «[jaxp_parser_impl].jar»: File or directory doesn't exists. /bin/ln: creating symbolic link «[xml-commons-jaxp-1.3-apis].jar»: File or directory doesn't exists. /usr/share/java-utils/java-functions: line 247: popd: directory stack empty shell-init: error retrieving current directory: getcwd: cannot access parent directories: File or directory doesn't exists. pushd: error retrieving current directory: getcwd: cannot access parent directories: File or directory doesn't exists. /bin/ln: creating symbolic link «[catalina-ant5].jar»: File or directory doesn't exists ... /usr/share/java-utils/java-functions: line 247: popd: directory stack empty I was using tomcat5 from standard Mandriva 2008 but probably the error will apply to other Linux distros/OSes where tomcat use a shell to start up. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat tool similar to top (Solved!)
Answering myself, and in case someone else is interested: Looks that newest versions of tomcat mananager provide some info about resource usage in a human readable way. Once setup all that needed is to point to: http://MyServer:8080/manager/status/all And quite detailed info will be providen about each webapp with an output similar to: localhost/wepapp1 Startup time: 2 ms TLD scan time: 0 ms Active sessions: 0 Session count: 0 Max active sessions: 0 Rejected session creations: 0 Expired sessions: 0 Processing time: 4 ms JSPs loaded: 0 JSPs reloaded: 0 Regards, Enrique --- Enrique Arizón [EMAIL PROTECTED] escribió: Hi, I have a tomcat server with around 50 diferents small apps running on it. Time to time one of those apps gets out of control, but standard OS tools like top just show the java process running up to 200% of CPU usage. I setup tomcat to allow jconsole to connect and monitor it. Still jconsole doesn't provide the needed info. That's, something similar to top (process monitor on Windows, prstat on Solaris) indicating the VM/CPU usage percentage. Does anyone have a similiar problem and knowns how to fix it? Regards! Enrique - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat clustering
Just one point: Notice clustering ussually must be made at the highest application layer. Generic Clustering support provided by containers can be of little help in a real world scenarios. If you users sessions are simple tomcat sessions clustering will be enough but if you have complex session data structures (let's say for example a java.util.ArrayList/Hashtable) you will need custom solutions to sync sessions between clustered nodes. The easy/non-optimal way to go could be to store state in a clustered database and use tomcat sessions to mark what must be fetch from database. Mysql makes a great help since it use in memory (RAM) storage for clustered tables, is easy to set up and just limited by the maximum node size (a few Gigas with modermcheap hardware). --- Ch Praveena [EMAIL PROTECTED] escribió: Hi all, I want to cluster Tomcat6 along with session replication to implement Loadbalancing. From the document, http://tomcat.apache.org/tomcat-6.0-doc/cluster-howto.html I have started making the things. Let me know where can I identify the default value of Multicast address is 228.0.0.4 Please let me know if any other tutorials or articles in a detailed way for performing Tomcat6 clustering. -- Regards, Praveena Chalamcharla, Securview - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat clustering
--- Christopher Schultz [EMAIL PROTECTED] escribió: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Enrique, Enrique Arizón wrote: | If you users sessions are simple tomcat sessions clustering will be | enough but if you have complex session data structures (let's say for | example a java.util.ArrayList/Hashtable) you will need custom | solutions to sync sessions between clustered nodes. Really? My experience has been that anything that properly implements java.io.Serializable does just fine migrating from node to node. Sure, migrating lots of data around a cluster is time-consuming and perhaps would not be considered a best-practice, but the container-provided clustering and session sync capabilities certainly do work. Completly agree. The case is that serialization is slow, really, really slow (at least in terms of CPU cicles) even serializing to local disks. But no doubt it works. What I mean is that trusting container clustering is going to solve any clustering problem can be a really wrong idea, mainly because the container limits to (correct me if I'm wrong) serialize over the network session data. If such session data is just a pointer to real data, it can work, otherwise it will miserable fail with no so big loads. On the opposite clustered databases will limit to sync changes (maybe just a few rows amongs maybe thousands of rows per user). Also a custom solution (a node notifying it's peers I changed this and this , please update) will work much better. I would argue that a small session footprint is critical to a robust web application, clustered or not. | Mysql makes a great help since it use in memory (RAM) storage for | clustered tables What are you talking about? The closest thing to clustered tables that MySQL supports is the FEDERATED storage engine, and there are no guarantees about RAM usage for it. Guess we are not speaking about the same thing. I refer to NDB Cluster engine: http://dev.mysql.com/doc/refman/5.0/en/mysql-cluster.html I read time ago that Google improved such engine for its own purposes and the next Mysql will show improved clustering stuff. Also, since Mysql is now part of Sun I guess also it will get a boost from Solaris engineering (I mean, Dtrace). - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.8 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkf6gT0ACgkQ9CaO5/Lv0PAV2wCgtSxf1Pcwi/8cXEuKsnu4EPAe 9hoAnir3tkn+qZ6l0pnoXhf1r4c9gVfY =QyZ9 -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Tomcat tool similar to top
Hi, I have a tomcat server with around 50 diferents small apps running on it. Time to time one of those apps gets out of control, but standard OS tools like top just show the java process running up to 200% of CPU usage. I setup tomcat to allow jconsole to connect and monitor it. Still jconsole doesn't provide the needed info. That's, something similar to top (process monitor on Windows, prstat on Solaris) indicating the VM/CPU usage percentage. Does anyone have a similiar problem and knowns how to fix it? Regards! Enrique - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
