Re: [Zope-dev] Problems with session on ZEO
On Wed, Aug 04, 2004 at 11:42:33PM +0200, Dieter Maurer wrote: Gerhard Schmidt wrote at 2004-8-3 09:34 +0200: ... Module Products.Sessions.SessionDataManager, line 94, in getSessionData Module Products.Sessions.SessionDataManager, line 183, in _getSessionDataObject SystemError: error return without exception set I had an issue in the same line: it called an incredibly expensive __len__ function. Maybe, in your case, it calls some broken __len__ function... I replaced the line by: # hasattr hides conflicts # DM 2004-07-09: and boolean tests may be very expensive! if getattr(ob, '__of__', None) is not None and getattr(ob, 'aq_parent', None) is not None: See whether this helps you... It seems that it does the Trick. :-)) No systemerror since i`ve done the change. Thanx a Lot Bye Estartu - Gerhard Schmidt | E-Mail: [EMAIL PROTECTED] TU-München| WWW Online Services | Tel: 089/289-25270| Fax: 089/289-22253| PGP-Publickey auf Anfrage pgpXsyRE70MDX.pgp Description: PGP signature ___ Zope-Dev maillist - [EMAIL PROTECTED] http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Problems with session on ZEO
On Wed, Aug 04, 2004 at 08:37:28AM -0400, Chris McDonough wrote: Wow! You appear to be the first person to get this symptom who does not use Plone. This is a great data point. This error is being tracked at http://zope.org/Collectors/Zope/1401 . There is no solution currently, we need volunteers to help reproduce and/or debug it. I am running plone2. Restarting the zeo server and one frontend fixes the problem for some time. i am running Zope 2.7.2 and Python 2.3.4 Here is the zeo config snip config I suspect the fact that you're running sessioning over ZEO doesn't much matter here as people who are using the default config also get the error... (which is a good data point in itself). Im getting this error since i have updated to Zope 2.7.1 and switched from filestorage to tempstorage for sessioning. Bye Estartu - Gerhard Schmidt | E-Mail: [EMAIL PROTECTED] TU-München| WWW Online Services | Tel: 089/289-25270| Fax: 089/289-22253| PGP-Publickey auf Anfrage pgpCKqh85YehB.pgp Description: PGP signature ___ Zope-Dev maillist - [EMAIL PROTECTED] http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Conflict errors on BDBMinimal storage
On Mon, May 17, 2004 at 12:45:16PM -0400, Chris McDonough wrote: On Thu, 2004-05-13 at 05:23, Gerhard Schmidt wrote: Hi, whe are running portal unter zope2.7 with one zeo server and six frontend application servers. I have set up zeo to server two storages filestorage main path $INSTANCE_HOME/var/Data.fs /filestorage minimalstorage temp envdir $INSTANCE_HOME/var/session /minimalstorage temp should provide an shared session. But when is set up the frontends to use temp as /temp_folder, we see many ZODB conflict errors. The performance decreases and PosErrors appear quite often. BDBMininalStorage is no longer maintained and doesn't do any conflict resolution. Why this. I was told some time ago we should use BDBMinimalStorage to fix the conflict problems. Even though you'll need to pack frequently, you might want to try a FileStorage instead. There is no difference between BDB Storage and Filestorage regarding the conflicts. Regardless, using ZEO will presumably always generate more conflict errors than using a local ZODB because the commit time is longer, and thus there's a better chance that two threads will be committing at the same time. The bottom line is that there is no way of getting an shared session running. Why isn´t there an implementation of temporary storage for ZEO I dont care about conflit resolution. Its only session data. I simply need a shared session storage. But as Far as i can see the is no way of doing this. Are we the only site out there running Plone2 (Placeless transaltion Service) at that scale. How do others handle there Session Bye Estartu -- Gerhard Schmidt| Nick : estartu IRC : Estartu | Fischbachweg 3 || PGP Public Key 86856 Hiltenfingen | [EMAIL PROTECTED] | auf Anfrage/ Tel: 08232 77 36 4 ||on request Fax: 08232 77 36 3 || pgpqXUCWUVwl0.pgp Description: PGP signature ___ Zope-Dev maillist - [EMAIL PROTECTED] http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Conflict errors on BDBMinimal storage
On Mon, May 17, 2004 at 01:38:15PM -0400, Chris McDonough wrote: On Mon, 2004-05-17 at 13:06, Gerhard Schmidt wrote: BDBMininalStorage is no longer maintained and doesn't do any conflict resolution. Why this. I was told some time ago we should use BDBMinimalStorage to fix the conflict problems. When was that and who told you so? Even though you'll need to pack frequently, you might want to try a FileStorage instead. There is no difference between BDB Storage and Filestorage regarding the conflicts. OK. Regardless, using ZEO will presumably always generate more conflict errors than using a local ZODB because the commit time is longer, and thus there's a better chance that two threads will be committing at the same time. The bottom line is that there is no way of getting an shared session running. It works doesn't it? You just get conflict errors, right? Conflict errors are normal at a certain level. No It doesn`t. At the Moment we run with single sessions on each frontend we have rewitten most ob the code using sessions to store ther information in cockies. But that´s not realy a good solution. Why isn´t there an implementation of temporary storage for ZEO There is, just use the tempstorage package from Zope. I didn´t find a way to use Tempstorage in zeo. temporarystorage name temporary storage for sessioning /temporarystorage didn´t work. How do i Set up a temporarystorage in zeo. I dont care about conflit resolution. Its only session data. For better or worse, because it is based on ZODB, the implementation makes you need to care. Than maybe the sessioncode should be redesigned not to use ZODB as storage but store ther information in some different system maybe a RDMB or some other system able to handle the kind of usage. I simply need a shared session storage. But as Far as i can see the is no way of doing this. I don't understand. You seem to have it working. Is performance the issue? The Performance decrase is there but the Problem is far deeper. If an read conflict isn´t resolved after three retries an Exception is raised an the request is aborted. And thats the real problem. Are we the only site out there running Plone2 (Placeless transaltion Service) at that scale. How do others handle there Session AFAIK Zope is the only appserver that even makes an attempt at allowing session data to be shared between servers like this. Most other appservers require you to set up session affinity in your load balancer and have a session database on each appserver. and nealy every system failed to do so. How do you implement this session affinity. Based on source IP. At the moment every large ISP uses multiple Proxyserver so every request comes from a different IP so the affinity doesn´t work for them. The Proxyserver provided by our Computing Center is also split on at least 8 Hosts, so everyone using this proxy would lose session infomation, getting very strange effekts. Bye Estartu -- Gerhard Schmidt| Nick : estartu IRC : Estartu | Fischbachweg 3 || PGP Public Key 86856 Hiltenfingen | [EMAIL PROTECTED] | auf Anfrage/ Tel: 08232 77 36 4 ||on request Fax: 08232 77 36 3 || pgpsBoo3UooYb.pgp Description: PGP signature ___ Zope-Dev maillist - [EMAIL PROTECTED] http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
