Well, I can understand Tim's comment about droppings. This configuration has made a mockery of my weekend. >:-(
Looking on the bright side - it'll soon be Monday ;)

First an interesting data point.

Assume for now that I'm not naming my zeo-clients - this would be begging for disaster - but all is not lost. For some arcane reason I have not yet tracked down, after running my 2 clients under load, I get these...
-rw-r--r-- 1 plone staff 10006534 25 Jul 05:30 /usr/local/zope/instances/prodZope/etc/1-None-0
-rw-r--r-- 1 plone staff 1404198 25 Jul 05:37 /usr/local/zope/instances/prodZope/etc/1-None-1
-rw-r--r-- 1 plone staff 5723516 25 Jul 05:02 /usr/local/zope/instances/prodZope/log/1-None-0
-rw-r--r-- 1 plone staff 10043763 25 Jul 04:20 /usr/local/zope/instances/prodZope/log/1-None-1

Nowhere have I asked it for cache files in either etc or log, but it sure makes sense that zope conspires to spread them around like this.

Next for a little scat perusal of my own. We're talking 2.7.2 now.

Here's the mystery.

I have never seen a cache file, in any of the recent 3 Zope versions I've just tested, with a name other than *-None-*. Has anyone else?

Note as well for anyone following on the Multi-Processor path, that Tres's tip about clienthome was slightly off, and yes, Paul Winkler was nearer the mark.

Tres wrote..
# zope.conf.appserver1
%include zope.conf.common
clienthome /path/to/zope/var/appserver1

Clienthome has no bearing on the cache file location. (AFAICT)

On 23 Jul 2004, at 18:38, Paul Winkler wrote:

You mean this, from zope.conf.in?

# Directive: zeo-client-name

Yes, Paul. That's the way to go. And it should be pretty easy. Add a single line to each conf file and restart.
Not so. I never saw the names of my cache files change. And they stayed in etc, and log sub dirs.

I walk through it here...

Starting in /ClientCache.py", line 142, at my pdb_trace() I believe that the client param should be the value of zeo-client-name from my .conf file. But I'm seeing 'None'. So we never even try to make anything by temporary caches.

Here's my stack:
File "/usr/local/zope/zope/lib/python/Zope/Startup/run.py", line 50, in ?
File "/usr/local/zope/zope/lib/python/Zope/Startup/run.py", line 19, in run
File "/usr/local/zope/zope272/lib/python/Zope/Startup/__init__.py", line 51, in start_zope
File "/usr/local/zope/zope272/lib/python/Zope/Startup/__init__.py", line 230, in startZope
File "/usr/local/zope/zope272/lib/python/Zope/__init__.py", line 47, in startup
File "/usr/local/zope/zope272/lib/python/Zope/App/startup.py", line 57, in startup
DB = configuration.dbtab.getDatabase('/', is_root=1)
File "/usr/local/zope/zope272/lib/python/DBTab/DBTab.py", line 96, in getDatabase
db = self._createDatabase(name, is_root)
File "/usr/local/zope/zope272/lib/python/DBTab/DBTab.py", line 113, in _createDatabase
db = factory.open()
File "/usr/local/zope/zope272/lib/python/Zope/Startup/datatypes.py", line 172, in open
DB = self.createDB()
File "/usr/local/zope/zope272/lib/python/Zope/Startup/datatypes.py", line 169, in createDB
return ZODBDatabase.open(self)
File "/usr/local/zope/zope272/lib/python/ZODB/config.py", line 97, in open
return ZODB.DB(section.storage.open(),
File "/usr/local/zope/zope272/lib/python/ZODB/config.py", line 148, in open
File "/usr/local/zope/zope272/lib/python/ZEO/ClientStorage.py", line 302, in __init__
client=client, var=var)
File "/usr/local/zope/zope/lib/python/ZEO/ClientCache.py"(142)__init__()
-> import pdb; pdb.set_trace();

up to /usr/local/zope/zope272/lib/python/ZEO/ClientStorage.py(302)__init__()
where I see formal param of client=None, and useful confirmation that client is "A name used to construct persistent cache filenames. Defaults to None"
There's no assignment to client in __init__(). So why is a client name not being passed in?

up to /usr/local/zope/zope272/lib/python/ZODB/config.py(148)open()
where I see client=self.config.client being passed to the constructor of class ZEOClient(BaseConfig)
and do :
{'read_only': False, 'realm': None, 'name': 'zeostorage', 'storage': '1', '_matcher': <SectionMatcher for type 'zeoclient'>, 'min_disconnect_poll': 5, 'server': [<ZConfig.datatypes.SocketAddress instance at 0x20bdbc0>], 'cache_size': 20000000, 'client': None, 'var': '/usr/local/zope/instances/zeo/var', 'max_disconnect_poll': 300, '_name': None, 'read_only_fallback': False, 'wait': True}
All fine, except 'client': None.

Interpretation gets a bit messy from there, so I switch to a top-down approach:
Starting from my config file:
grep zeo-client-name zope_1.conf
# Directive: zeo-client-name
# zeo-client-name. If you use ZEO and you don't set a
# zeo-client-name, the client cache is stored in temporary files
# of zeo-client-name is used to uniquely identify the local cache
# zeo-client-name zeo1
zeo-client-name zeo1

Fair enough. I'm setting a name. Here are my other critical items:
zodb_db temporary>
name sessions
mount-point /temp_folder
container-class Products.TemporaryFolder.TemporaryContainer

<zodb_db main>
mount-point /
server localhost:8800
storage 1
name zeostorage

So I cd to the zope root and..
grep -r zeo-client-name *
lib/python/Zope/Startup/zopeschema.xml: <key name="zeo-client-name" handler="zeo_client_name">

So zeo-client-name is handled by zeo_client_name. Great! I shoved a pdb_trace there. n and l give me
76 def zeo_client_name(value):
77 value and _setenv('ZEO_CLIENT', value)
78 import pdb; pdb.set_trace()
79 -> return value
(Pdb) value

Cool! So far so good.

But this brings me to the gap.. How is ZEO_CLIENT in the environment going to get into self.config.client in the ZEOClient? Bearing in mind grep -r ZEO_CLIENT * shows me only comments, apart from the handler, where it is set.

Any ideas? Anyone seen anything but *-None-* for cache files?

Meanwhile, I'm going to see why zope gets creative about spreading the cache files around.


On 23 Jul 2004, at 21:37, Chris McDonough wrote:

On Fri, 2004-07-23 at 16:21, Tim Peters wrote:
[Chris McDonough]
self._f[current] = open(self._p[current],'w+b')

.... will be likely to fail at the last line if you're using
nonpersistent cache files, because self._p[current] is (bogus)
'1-None-0' (relative bogus filename).

Is it really *likely* to fail?

I suppose it depends on the working directory of the shell/process used
to start Zope. Zope doesn't mess with the working directory on its own,

If you follow Richard Stevens' ("UNIX Network Programming" guy,
apparently now dead) advice, he says that "well-behaved" daemon
processes should change their working directory to "/". So I suspect
there are daemonizers that do this.

Guido's zdrun daemon (which "zopectl" uses) gives you an option to set
the working directory of the daemonized process, but I don't use it
(neither zdrun nor the option, that is). It does nothing to the working
directory by default.

But I think the common case is that the program is run out of an
/etc/init.d "rc" script, and I suspect the working directory is "/" when
Zope gets started in that circumstance. Which I guess makes the error

It's just a name, and it's opened in
'w' ('+b') mode, not 'r' mode. That is, it creates the file -- no
file of that name need already exist (and if one does, it tries to
overrwrite it). Running on Windows most days, I'm not usually aware
of all the permission bugs Linuxheads delight in torturing themselves
with <wink>.

Yes. Gotta agree with you there. I don't think a day passes where I
don't want to rip the face off the guy who proclaimed that TCP ports
below 1024 couldn't be bound to by a user other than root. What a

There should probably be a _using_persistent_cache flag attr rather than
trying to inspect self._p to find out if we're using persistent caches.

+1. As you later discovered, this "hmm, let's try to guess what we're
doing based on obscure droppings" business is a continuing bug

Thankfully, Dieter fixed it so it doesn't (at least in this one case).

I may try to work up a patch + test for this later.

I'm neutral on whether you try, but +1 on you actually doing it <wink>.

Too late! It's already fixed. I didn't know either. ;-) This thread
was full of sound and fury....

- C

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Russ Ferriday
Solution Workshops for Plone
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