RE: [Zope] Problem with running same script at a time
Thank you Dieter, I will try it. -Original Message- From: Dieter Maurer [mailto:[EMAIL PROTECTED] Sent: Friday, September 22, 2006 8:03 PM To: Pletli Antal Cc: zope@zope.org Subject: RE: [Zope] Problem with running same script at a time Pletli Antal wrote at 2006-9-22 08:51 +0200: > ... >I have a demo user folder in my Zope project with two scripts. The >first script sends a tcp message to the background (with the help of >external module), the second one do something when the background call >it via url. The problem is your setup. I have to explain a bit that you can understand the problem. Zope's request processing has roughly two phases: URL traversal to locate the object identified by the URL and then calling the located object. At the end of URL traversal lies the user authentication. This proceeds as follows: Zope starts at the located object and looks upward (towards to root) to find a User Folder which is ready to authenticate the user with the required roles. It will ask each User Folder it finds above the object until one gives a positive answer. The highest user folder will always return a user, maybe the anonymous one. If your User Folder calls out to a backend system and this backend system calls back (via URL) into an area controlled by your User Folder, then you lose -- as the User Folder will again call out and wait for an answer before it will call the object... Move the thing called back out of your hiararchy dominated by the UserFolder. Then, you might have success. -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] Problem with running same script at a time
Pletli Antal wrote at 2006-9-22 08:51 +0200: > ... >I have a demo user folder in my Zope project with two scripts. The first >script sends a tcp message to the background (with the help of external >module), the second one do something when the background call it via >url. The problem is your setup. I have to explain a bit that you can understand the problem. Zope's request processing has roughly two phases: URL traversal to locate the object identified by the URL and then calling the located object. At the end of URL traversal lies the user authentication. This proceeds as follows: Zope starts at the located object and looks upward (towards to root) to find a User Folder which is ready to authenticate the user with the required roles. It will ask each User Folder it finds above the object until one gives a positive answer. The highest user folder will always return a user, maybe the anonymous one. If your User Folder calls out to a backend system and this backend system calls back (via URL) into an area controlled by your User Folder, then you lose -- as the User Folder will again call out and wait for an answer before it will call the object... Move the thing called back out of your hiararchy dominated by the UserFolder. Then, you might have success. -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Problem with running same script at a time
Pletli Antal wrote: When I move the second script into other outer folder, all is OK. It is very strange, and I'v never read from this problem before. Eh? You've never heard of a blocking problem before? You're creating a blocking loop, which you seem to have now fixed... nothing odd about that... Chris -- Simplistix - Content Management, Zope & Python Consulting - http://www.simplistix.co.uk ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] Problem with running same script at a time
Thank you Dieter! Here is the exact scenario, which in I first observed the problem: I have a external zope python module that communicates via TCP with a background system written in Java. I have a background system that communicates with the Zope via URL. I have a demo user folder in my Zope project with two scripts. The first script sends a tcp message to the background (with the help of external module), the second one do something when the background call it via url. First the Zope script sends a tcp message to background system, and waits for the reply. The background receives the message and try to call the url by http request, then if it is success replies to Zope script's tcp request. Here is the problem. The background system cannot access the URL until in the first script tcp timeout happen. When I move the second script into other outer folder, all is OK. It is very strange, and I'v never read from this problem before. Best regards, Antal -Original Message- From: Dieter Maurer [mailto:[EMAIL PROTECTED] Sent: Thursday, September 21, 2006 7:46 PM To: Pletli Antal Cc: zope@zope.org Subject: RE: [Zope] Problem with running same script at a time Pletli Antal wrote at 2006-9-21 09:12 +0200: > ... >I use the same product. >This problem is one of the others... I had to fix a problem in "psycopg": During "connect", Python's Global Interpreter Lock (GIL) was not released (freezing Zope during connect). Usually, this is not a problem as "connect" is quite a fast operation. We noticed it only when the server for the postgres installation was down (then "connect" became a several minute operation until the TCP timeout happened). However, it is unlikely, that this is your problem. >The behaviour is the same when i >use long socket communication (as a tcp client), etc. This, too, should not happen -- and I never observed it (but a colleague reported something like this but never showed it to me -- and I did not believe him; or more precisly, I tested his alledgedly observed behaviour and could not reproduce it...) >In these cases the >folder wich contains the scripts be unaccessible. Unbelievable -- unless your folder access triggers the long socket communication. In this case, it would not be the old socket communication that "blocks" but the new one. Of course, your folder access should not trigger anything else... -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] Problem with running same script at a time
Pletli Antal wrote at 2006-9-21 09:12 +0200: > ... >I use the same product. >This problem is one of the others... I had to fix a problem in "psycopg": During "connect", Python's Global Interpreter Lock (GIL) was not released (freezing Zope during connect). Usually, this is not a problem as "connect" is quite a fast operation. We noticed it only when the server for the postgres installation was down (then "connect" became a several minute operation until the TCP timeout happened). However, it is unlikely, that this is your problem. >The behaviour is the same when i >use long socket communication (as a tcp client), etc. This, too, should not happen -- and I never observed it (but a colleague reported something like this but never showed it to me -- and I did not believe him; or more precisly, I tested his alledgedly observed behaviour and could not reproduce it...) >In these cases the >folder wich contains the scripts be unaccessible. Unbelievable -- unless your folder access triggers the long socket communication. In this case, it would not be the old socket communication that "blocks" but the new one. Of course, your folder access should not trigger anything else... -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] Problem with running same script at a time
My system is a developer server so i'm the only one who use the zope. When i run the script there is not other worker script. I'm newbie but i read that there is a tool named zasync that maybe solves my problem but i cannot install it yet. I would like solve my problem without this if possible. Antal -Original Message- From: Andreas Jung [mailto:[EMAIL PROTECTED] Sent: Thursday, September 21, 2006 9:17 AM To: Pletli Antal; Dieter Maurer Cc: zope@zope.org Subject: RE: [Zope] Problem with running same script at a time --On 21. September 2006 09:12:47 +0200 Pletli Antal <[EMAIL PROTECTED]> wrote: > Hi Dieter! > > Than you for your answer! > I use the same product. > This problem is one of the others... The behaviour is the same when i > use long socket communication (as a tcp client), etc. In these cases > the folder wich contains the scripts be unaccessible. > Maybe have i a wrong zope configuration (i use default config)? > > Perhaps you're other worker threads are blocked by long-running requests? -aj ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] Problem with running same script at a time
--On 21. September 2006 09:12:47 +0200 Pletli Antal <[EMAIL PROTECTED]> wrote: Hi Dieter! Than you for your answer! I use the same product. This problem is one of the others... The behaviour is the same when i use long socket communication (as a tcp client), etc. In these cases the folder wich contains the scripts be unaccessible. Maybe have i a wrong zope configuration (i use default config)? Perhaps you're other worker threads are blocked by long-running requests? -aj pgpKF3XMoY3zw.pgp Description: PGP signature ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] Problem with running same script at a time
Hi Dieter! Than you for your answer! I use the same product. This problem is one of the others... The behaviour is the same when i use long socket communication (as a tcp client), etc. In these cases the folder wich contains the scripts be unaccessible. Maybe have i a wrong zope configuration (i use default config)? Antal -Original Message- From: Dieter Maurer [mailto:[EMAIL PROTECTED] Sent: Wednesday, September 20, 2006 9:40 PM To: Pletli Antal Cc: zope@zope.org Subject: Re: [Zope] Problem with running same script at a time Pletli Antal wrote at 2006-9-20 14:48 +0200: >I have experienced that when i run a python srcipt (it is a long >postresql query) from a user folder then i cannot access this folder >from management form while the process is running. If i try at the >same time to run this script again the process will start after the >other one ends. Other folder are accessible. What do i wrong? This is surprising... You might be using an unfortunate Postgres adapter library. We are using "psycopg" and do not observe this problem. -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Problem with running same script at a time
Pletli Antal wrote at 2006-9-20 14:48 +0200: >I have experienced that when i run a python srcipt (it is a long >postresql query) from a user folder then i cannot access this folder >from management form while the process is running. If i try at the same >time to run this script again the process will start after the other one >ends. Other folder are accessible. What do i wrong? This is surprising... You might be using an unfortunate Postgres adapter library. We are using "psycopg" and do not observe this problem. -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
