On Dec 17, 2007, at 7:36 AM, Chris Bainbridge wrote:

I have a ~9GB live ZEO database. Last night I tried to pack it, but
got this error:

2007-12-17T01:27:08 (4179) Error raised in delayed method
Traceback (most recent call last):
File "/home/user/lib/python/ZODB3-3.7.2-py2.4-linux-i686.egg/ZEO/ StorageServer.py",
line 1016, in run
   result = self._method(*self._args)
File "/home/user/lib/python/ZODB3-3.7.2-py2.4-linux-i686.egg/ZEO/ StorageServer.py",
line 351, in _pack_impl
   self.storage.pack(time, referencesf)
File "/home/user/lib/python/ZODB3-3.7.2-py2.4-linux-i686.egg/ZODB/ FileStorage/FileStorage.py",
line 1352, in pack
   opos = p.pack()
File "/home/user/lib/python/ZODB3-3.7.2-py2.4-linux-i686.egg/ZODB/ FileStorage/fspack.py",
line 482, in pack
File "/home/user/lib/python/ZODB3-3.7.2-py2.4-linux-i686.egg/ZODB/ FileStorage/fspack.py",
line 228, in findReachable
File "/home/user/lib/python/ZODB3-3.7.2-py2.4-linux-i686.egg/ZODB/ FileStorage/fspack.py",
line 315, in findReachableAtPacktime
   self.reachable[oid] = pos
File "/home/user/lib/python/ZODB3-3.7.2-py2.4-linux-i686.egg/ZODB/ fsIndex.py",
line 84, in __setitem__
   tree[key[6:]] = value
2007-12-17T01:27:16 (7412) opening storage '1' using FileStorage
2007-12-17T01:34:25 datastore.fs truncated, possibly due to damaged
records at 8580513351
2007-12-17T01:34:25 Writing truncated data from datastore.fs to datastore.fs.tr0

Are there any limits on the pack operation?

No, but it *does* use a fair bit of memory.

I assume that it doesn't
have to hold the entire DB in memory at once?

No, but it does need to hold some large data structures in memory.

Would bringing the
database offline and then packing it work (ie. we run out of memory
because we have many active clients), or is there some fundamental
constraint in the underlying code?

I doubt that taking the database offline would make much difference. How much memory do you have on the machine?

How much memory did the server process use before packing?


Jim Fulton
Zope Corporation

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