[ZODB-Dev] FileStorage modifiedInVersion KeyError -- how to correct and/or debug?

[Joseph Wayne Norton]

Steve -

I followed your additional instructions and as of right now I am not
receiving an error message.  The difference in size between the old
and new index (after simply restarting and then stopping to force
the index to be written to disk) is 8 bytes.
   
   ls -la
   total 249516
   drwxr-xr-x   2 zfs      zfs         2048 Oct 10 01:12  ./
   drwxr-xr-x   5 zfs      zfs         2048 Oct 10 01:12  ../
   -rw-r--r--   1 zfs      zfs      55602267 Oct 10 02:22 Data.fs
   -rw-r--r--   1 zfs      zfs      1504081 Oct 10 01:12  Data.fs.index
   -rw-r--r--   1 zfs      zfs      1504089 Oct 10 01:11  Data.fs.index.BAK
   -rw-r--r--   1 zfs      zfs            5 Oct 10 01:12  Data.fs.lock
   -rw-r--r--   1 zfs      zfs      65556931 Oct  5 09:47 Data.fs.old
   -rw-r--r--   1 zfs      zfs       300937 Oct 10 02:22  Data.fs.tmp

I'm not 100% sure but I feel this error was caused by a version
upgrade of either python, zope, zeo, etc. or a systematic error on my
part.  I faced the same issue on both the linux and solaris platforms.

- any ideas?

- i'm not aware of any method to perform a sanity check on a zodb
database, any tools that you are aware of?

thanks,

- joe n.



At Sat, 06 Oct 2001 08:04:55 +0100,
Steve Alexander wrote:
> 
> Joseph Wayne Norton wrote:
> 
> > 
> > So, would you recommend that the index for the zodb be rebuilt?  
> > 
> > If so, my guess is that I can stop the zeo server, truncate the
> > Data.fs.index file, restart zeo, and it will re-generate the index
> > file.
> 
> 
> 
> 
> Don't truncate the Data.fs.index file. Simply remove it, and restart. 
> FileStorage will create a fresh one.
> 
> However, I suggest you keep the Data.fs.index around (move it to another 
> directory).
> 
> It is possible, although unlikely, that you have some nasty corruption 
> in your Data.fs. The Data.fs.index file can help greatly in recovering 
> the data.
> 
> You'll know if this is the case if your ZEO server doesn't start up 
> properly when you restart it, and complains about a corrupted Data.fs.
> 
> --
> Steve Alexander
> Software Engineer
> Cat-Box limited
>