[Zope] MappingStorage for ZEO Sessions?

[george donnelly]

hi

I have a 4 client ZEO cluster that I am setting up a central sessions
storage for. I'm wondering if someone can give me a little feedback on
what I have done, eg i have a few questions:

1. am i doing this right?

2. where does the mapping storage store itself on the filesystem? as
part of the Data.fs of the root-mounted filestorage?

3.  If i add a transient object container a level below the zope root,
will its data also get stored in the Mapping Storage?

I am using MappingStorage and it is setup in zeo.conf like this:

<mappingstorage sess>
  name mapping storage for sessions
</mappingstorage>

in zope.conf I have the temporary storage setup like this:

<zodb_db temporary>
    <zeoclient>
     server 192.168.1.4:8424
     storage sess
     name temporary mapping storage for sessioning
   </zeoclient>
    mount-point /temp_folder
    container-class Products.TemporaryFolder.TemporaryContainer
</zodb_db>

in zeo.log I get this:

2004-05-04T14:21:51 INFO(0) RUNSVR opening storage 'sess' using
MappingStorage
------
2004-05-04T14:21:51 INFO(0) ZSS:7175 StorageServer created RW with
storages: 1:RW:/path/to/zeohome/var/Data.fs, sess:RW:mapping storage for
sessions

and later this:


2004-05-04T14:46:13 INFO(0) zrpc-conn:192.168.1.4:60202 zeoLoad() raised
exception: '\x00\x00\x00\x00\x00\x00\x00\x00'
Traceback (most recent call last):
  File "/usr/local/zope/270/lib/python/ZEO/zrpc/connection.py", line
264, in handle_request
    ret = meth(*args)
  File "/usr/local/zope/270/lib/python/ZEO/StorageServer.py", line 248,
in zeoLoad
    p, s = self.storage.load(oid, '')
  File "/usr/local/zope/270/lib/python/ZODB/MappingStorage.py", line 56,
in load
    p = self._index[oid]
KeyError: '\x00\x00\x00\x00\x00\x00\x00\x00'

the client connects fine, under Control Panel > Databases > temporary I
see:

Database Location 
temporary mapping storage for sessioning (connected) 

Database Size 
239.0K 

also there are many writes and few loads.

tia
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