Johnny, Thanks for "sharing" this info - good to know it works beyond my simple tests so far. You bring up a number of good points, things to consider and test out - e.g. I can see what you mean about the issues of mid-stream uploads not being handled gracefully in some cases. For us it should not be a problem they way we are partitioning the workload.
Johnny Kewl wrote: > > > ----- Original Message ----- > From: "Richard M" <[EMAIL PROTECTED]> > To: <users@tomcat.apache.org> > Sent: Tuesday, August 05, 2008 5:21 AM > Subject: Can two Tomcat's safely share the same webapps directory? > > >> >> I looked through the documentation and searched the user list and web for >> the >> answer to this. I found a lot of postings that talked about using NFS >> sharing to share the actual Tomcat software directories, but none that >> dealt >> with trying to share an expanded web application between two instances of >> Tomcat Actually one Tomcat instance is on a separate machine - using NFS >> to >> mount the directory. >> >> Background: This is a legacy application (somewhat of a content >> management >> system) that places user-uploaded files in the web application directory. >> The application is not deployed as a WAR file, just the JSP's and classes >> directories are updates as needed. No change to change the app in the >> short-term. We are trying to move some batch processing to a separate >> instance of Tomcat and want both Tomcat's looking at the same webapps >> directory so the second Tomcat instance can mostly read, but possibly >> update >> some of the content files. >> >> Progress: Well so far it seems to work in preliminary testing. Is there >> anything or any reason to shy away from this solution? Both Tomcat's will >> have separate work directories. The JSP's will run on the first Tomcat >> instance, the batch processing on the second. >> >> Thanks in advance for any ideas, thoughts, etc. - Richard > > Richard, I got a little Samba link going with a few shared web apps, no > high > traffic, but no problems... > Ie sharing a webapp only I think will only give you normal issues... like > for example, if your uploading file is busy writing to a JSP, and that is > viewed at the same time, will probably get a compiler exception... I have > never seen one ;) and you can get uploaders to get the whole file before > writing it to location, so those are normal issues... if it was an html > file, the user may only see half a file, if they just catch it.... > > But one thing you cannot do, especially on windows is share the catalina > base.... ie the whole TC structure... ie if logs are now trying to share > the > same folder, then I think that is definite problems, especially on a MS > system. > > A stupid little test I do on windows, is open files with notepad... > because > notepad holds the lock... you will see that you can open a JSP in notepad > and TC will still read it... but with log files, you'll see that windows > tells notepad to take a hike... ie one TC owns that log only... > > It will work... you just got to think about how you changing files if it > gets really busy... the normal things to worry about.. > > TC is made... think about the ~user shared folders for example, for one to > drop JSP and html files into it, like say one would when FTPing up to a > site... so you can safely expect that to work.... when it comes to servlet > classes and things like that... then the fun would really start... because > even if you turn on TC's lib change detection, theres dependencies to > worry > about etc.... JSP/HTML... no problem... have fun > > Of course in your software... you want to make sure you access files read > only and that you dont hold locks... ie if you batch processing software > went an held a JSP file for half an hour... well then TC wouldnt be able > to > get at it, should it want to recompile it... normal stuff ;) > --------------------------------------------------------------------------- > HARBOR : http://www.kewlstuff.co.za/index.htm > The most powerful application server on earth. > The only real POJO Application Server. > See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm > --------------------------------------------------------------------------- > > > > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- View this message in context: http://www.nabble.com/Can-two-Tomcat%27s-safely-share-the-same-webapps-directory--tp18823860p18831240.html Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
