[ZODB-Dev] ZEO: StorageTransactionError

[fzachman]

Hmm..I guess no one is familiar with this problem.

Can anyone tell me where else I might try asking?  I only chose this
list because it's the only one listed on zope.org as having to do with
ZEO. :/

Thanks
Forest

On Tue, 2003-05-27 at 09:14, fzachman wrote:
> Hello,
> 
> We recently upgraded one of our clients ZEO clusters from Zope 2.5 to
> Zope 2.6.  The impetus behind this was a need to share sessions amongst
> the clients via a Berkeley storage backend. (So our ZEO server is using
> vanilla ZODB with a Berkeley storage mounted inside of it to hold the
> session objects.)
> 
> Later the same night of the upgrade one of our users got this error:
> 
> StorageTransactionError: Multiple simultaneous tpc_begin requests from
> one client.
> 
> After this the site was locked up and the person on staff set them back
> up to using the old system, where it's back and running again with no
> problems.
> 
> I tried running the usual queries on this and couldn't find anything
> short of cvs checkin logs.  The offending bit of code seems to be in the
> StorageServer's tpc_begin:
> 
>     def tpc_begin(self, id, user, description, ext, tid, status):
>         if self.read_only:
>             raise ReadOnlyError()
>         if self.transaction is not None:
>             if self.transaction.id == id:
>                 self.log("duplicate tpc_begin(%s)" % repr(id))
>                 return
>             else:
>                 raise StorageTransactionError("Multiple simultaneous
> tpc_begin"
>                                               " requests from one
> client.")
> 
> I confess I'm not entirely sure what's going on here as I've just taken
> to maintaining this setup and I'm not all that familiar with ZEO.  It
> seems that the client tried to begin more than once, and the second (or
> x subsequent) time it somehow had a different transaction id?
> 
> I'm not sure if this is an issue with Zope 2.6.1 or with the use of the
> Berkeley DB. (I hate upgrading 2 things at once. ;)
> 
> Has anyone else encountered this?
> 
> Oh, and for completeness:
> 
> Redhat 8.0
> Python 2.1.3
> ZEO 2.0.1b
> Zope 2.6.1
> 
> Any help would be greatly appreciated.
> 
> Forest
> 
> 
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