Re: Can't get into snapshot, was Re: Backup aborted - why? (dirstor 1.1.9)

On Tuesday 28 December 2004 21:07, Paul Winkler wrote:

> Aaaand now that that's taken care of, and I've restarted
> the ZEO server and confirmed that it leaves snapshot mode
> after startup, I can no longer get into snapshot mode :-(
> 
> Here's the error:
> Traceback (most recent call last):
>   File "snapshot.py", line 260, in ?
>     main()
>   File "snapshot.py", line 61, in main
>     s.acquire()
>   File "snapshot.py", line 108, in acquire
>     lock_file(f)
>   File "/zope/Zope-2.7.3-0-SoftwareHome/lib/python/ZODB/lock_file.py", line 
42, in lock_file
>     fcntl.flock(file.fileno(), _flags)
> IOError: [Errno 11] Resource temporarily unavailable

Something has locked the file misc/sublock. On linux 'lsof' will tell you 
what. 

But this is strange.... The only call to lock_file in acquire in snapshot.py 
is inside an exception handler for IOError. It should be converting this 
exception to a DirectoryStorageError('could not lock storage directory')

That line is commented # Forget to patch ZEO? See doc/install and 
http://dirstorage.sourceforge.net/install.html.
That patch is only for older ZEO versions, and your log indicates that the 
remote method call is getting through. Maybe there is some other version 
incompatibility here.

> Here's the server log since the restart... is that PROBLEM line 
> something to worry about?

This one?...

> 2004-12-28T15:46:10 PROBLEM(100) DirectoryStorage shutdown without snapshot

It normally puts the storage into snapshot mode when shutting down. This 
message indicates that it tried and failed. 

On startup there is no message "Engaging in snapshot mode", so that file lock 
had definitely been released at that point.


That gives you plenty of strange things for further debugging. Sorry I cant be 
of more direct help.

-- 
Toby Dickenson

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