;t really know whether the transaction committed or not.
It's much worse if multiple storages are involved.
> I restarted the
> client to be on the safe side, but it'd be good to know for sure.
Restarting wouldn't necessarily make any differen
On Thu, Nov 4, 2010 at 10:31 AM, Chris Withers wrote:
> On 04/11/2010 13:43, Jim Fulton wrote:
>>> I'm curious:
>>>
>>> - Why is the timeout not logged at ERROR or even CRITICAL?
>>
>> Because it was considered to be neither. It's also not
On Thu, Nov 4, 2010 at 11:03 AM, Chris Withers wrote:
> On 04/11/2010 14:50, Jim Fulton wrote:
>>
>> Actually, I think it should be used, at least for applications with
>> high availability requirements. For applications like our's (ZC's)
>> it amounts to a
tainly thoughtr about it a lot. In practice,
I doubt the benefit will be worth the extra overhead (let alond the
effort :).
Jim
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On Wed, Dec 8, 2010 at 7:45 AM, Malthe Borch wrote:
> On 8 December 2010 13:28, Jim Fulton wrote:
>>> With 20 active threads, each having rendered the Plone 4 front page,
>>> this approach reduced the memory usage with 70 MB.
>>
>> Out of a total of what?
>
&
use the zdaemon backoff-limit option to configure zdaemon
to wait much longer before doing a hard kill.
Jim
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kup processes,
I don't use repozo myself, but I believe it detects packs and
makes a full backup after a pack.
> a pack removing weakly referenced objects,
I'm not sure what you're referring to or if you have
a question.
> impact on the Data.fs index, ...
A new index file i
I tend to think
> interface should be fixed).
We should probably change the interface. I didn't want to do that
because that would require changes to existing storages.
For better or worse, I made another required storage change
lately to add the checkCurrentSerialInTransaction method, and I
sho
t or somethink like it will go
into that release.
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s query should not
>> trigger the instantiation.
I assume you're talking about activation (instantiation isn't a good
word here) of the child. Simply getting the child won't activate it,
but almost any operation on it will.
a.child is None
won't cause the child to
t.
...
> Perhaps too much to ask: can I observe the state of the object (without
> changing it)? For example indirectly by logging data base access and
> noting that attribute access does cause data base access for a ghost.
I don't understand the question.
What problem are you trying
for someone who's willing
to grok the Python C APIs.
Changing the default sizes for the II ad LL BTrees is pretty straightforward.
We were more interested in LO (and similar) BTrees. For those,
it's much harder to guess sizes because you don't know generally
how big the objects will b
ode above is broken.
Note that the storage could validate the reference to x when self is
saved, but no storage that I know of does, for performance reasons.
In some future version of ZODB, it might be nice to change the
database record structure to make this sort of check easier.
Jim
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> ## http://LibreOffice.org
> ## Support the Document Foundation (http://documentfoundation.org)
> ## Meine Seite: http://www.amantke.de
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> http://www.zope.or
I've released ZODB 3.10.2.
http://pypi.python.org/pypi/ZODB3/3.10.2#bugs-fixed
This release primarily removes an optimization that caused severe
problems for some applications.
Jim
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For
operations.
I don't know about relstorage, but for FileStorage, commit locks are
only held in the very last stage of packing after the vast majority of
the work is done. Even then, the commit lock is released periodically
to let new transactions proceed.
Jim
--
stores multiple blobs, and the OIDs of some of those
> blobs differ by a multiple of 997, then cache filenames will collide.
I'm at a loss as to why you would think this.
The the blob file names use the full oid.
Jim
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blob directories and the non-shared blob
implementation suffered from neglect, which I at least tried to
rectify in ZODB 3.9.
Jim
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FileStorage
It writes progress information to it's own logs. Not sure how easy it
is to figure out.
> This is because packing usually takes very long time and it might hard
> to observe when the process might complete.
I agree that this would be a useful feature.
I suggest making a b
as there are records
remaining, but not all of the records stay around. I'm not sure what
you meant above, but if you think all of the records in the
transaction stay around, the answers is no.
Jim
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emory (as they're saved in temporary storage).
If you aren't writing data, savepoints don't buy you anything and you
should simply call cacheGC yourself periodically.
Jim
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For more inf
cache miss rate by 25-50%, depending
on the cache size. It also contains some small optimizations to the
storage server code.
Jim
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e these bugfixes in Plone 4.0.6.
I plan to release this today.
Jim
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On Mon, Apr 18, 2011 at 11:29 AM, David Glick wrote:
>
>
> On Apr 18, 2011, at 8:16 AM, "Jim Fulton" wrote:
>
>> On Fri, Apr 15, 2011 at 2:16 PM, Eric Steele wrote:
>>> Jim (et al),
>>>
>>> Could I trouble you for backports of
>>>
ments that can be done at the OS or even application
> layer that might improve performance?
Look at how your application is using data. If you have requests that
have to load a lot of data, maybe you can refactor your application to
load fewer.
Jim
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ng data. If you have requests that
>> have to load a lot of data, maybe you can refactor your application to
>> load fewer.
>
> A quick check with nethogs shows values of network usage oscillating
> between 100 and 200 KB/s. But I guess that if I were loading an
> excessive amount o
lasses of persistent which overwrite
> various hooks.
>
> Maybe option one is the easiest here, but it would need some
> documentation about this being a best practice. Until now I didn't
> realize the implications of setting attributes to unchanged values.
I think the best app
ur ZEO cache and store the ZEO cache on either a RAM disk (try mount
> -t tmpfs none /some/path) or a solid state disk. Remember that seek
> time is 5-10 ms with spinning drives, so putting a ZEO cache on a
> spinning drive can actually kill performance.
If this on Linux and you have enoug
On Fri, May 6, 2011 at 4:21 PM, Shane Hathaway wrote:
> On 05/06/2011 02:14 PM, Jim Fulton wrote:
>>>
>>> It sounds like you primarily need a bigger and faster cache. If you
>>> want to make minimal changes to your setup, try increasing the size of
>>> yo
ant to implement a restriction like this, do it in a wrapper class.
Jim
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ough they typically use BTrees. For
example, indexes typically use forward and reverse mappings to
facilitate inindexing without having to store old document values.
- Events to signal when objects should be added, updated, or removed
from the index(es).
Jim
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tate would be set on the storage
server.
- The win depends on being able to load a blob
file independently of loading blob objects, although
the ZEO blob cache implementation already depends
on this.
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G, I sent this before I was done. Had some sort of gmail missfire,
I thought the email was lost. :/
On Wed, Jul 6, 2011 at 2:44 PM, Jim Fulton wrote:
> We're evaluating AWS for some of our applications and I'm thinking of adding
> some options to support using S3 to st
On Thu, Jul 7, 2011 at 9:42 AM, Alan Runyan wrote:
> On Wed, Jul 6, 2011 at 1:44 PM, Jim Fulton wrote:
>> We're evaluating AWS for some of our applications and I'm thinking of adding
>> some options to support using S3 to store Blobs:
>
> Mind clarifying, is the a
On Thu, Jul 7, 2011 at 9:13 AM, Laurence Rowe wrote:
> On 6 July 2011 19:44, Jim Fulton wrote:
...
> Adding the ability to store blobs in S3 would be an excellent feature
> for AWS based deployments. I'm not convinced that presenting S3 urls
> to the end users is terribly usef
There is certainly some opportunity for doing things in parallel
up until you get to tpc_vote. I wonder if renames in S3 take much
time. I can image that they do.
Jim
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For more information about
to
reporoduce the problem. I would think that if a request returns an
incorrect Blob, it would continue to. If someone reports a bad blob,
get the URL and see if you can reproduce by making the same request to
each of the app servers, bypassing the load balencer. If one server
is being bad, you
's a bug in ZODB, it's one I haven't seen and I'd have no idea
what it's parameters might be. I suppose anything's possible. :)
Note that, in the actually database file, blobs have no data.
All that matters is their oid and serial. I can't imagine
emoved during recovery
>
> Any more options?
Use multi-zodb-check-refs with the -r option to get a database of
reverse references.
Use that do figure out what's refering to the missing object and fix
that object(s) so that
it no longer does.
Jim
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On Thu, Jul 14, 2011 at 10:12 AM, Andreas Jung wrote:
>
>
> Jim Fulton wrote:
>>>
>>> 2011-07-14 13:36:22 INFO Z2 Shutting down
>>
>> That error message seems rather weird. WTF SIGINT?
>
> Likely caused during the Zope shutdown amd unrelated).
I find
ter(a)
> app._p_jar._added[a._p_oid] = a
> transaction.commit()
>
> At Jarn we've used that trick many times to repair broken internals in
> the intid/keyreference data structures.
Do you have any theories why objects are going away for you?
The only time we've seen
On Thu, Jul 14, 2011 at 3:58 PM, Hanno Schlichting wrote:
> On Thu, Jul 14, 2011 at 9:40 PM, Jim Fulton wrote:
>> On Thu, Jul 14, 2011 at 3:23 PM, Hanno Schlichting wrote:
>>> At Jarn we've used that trick many times to repair broken internals in
>>> the in
On Fri, Jul 15, 2011 at 3:58 AM, Hanno Schlichting wrote:
> On Thu, Jul 14, 2011 at 10:30 PM, Jim Fulton wrote:
>> Is the symptom you're seeing POSKeyError?
>
> Yes, ...
This is disturbing. It would be good to better understand the reasons.
I've thought of checking
On Tue, Jul 26, 2011 at 3:55 AM, Stéphane Klein wrote:
> Hi,
>
> some time ago, someone ask how to get list of all objects which where
> modified in a transaction :
> http://article.gmane.org/gmane.comp.web.zope.zodb/5734
>
> Jim Fulton said « there isn't a public API fo
ibers to events. It would be great if this kind of feature existed so
> you could have an overview of what happens during a transaction.
You don't need a public API for debugging.
Jim
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For
On Thu, Jul 28, 2011 at 9:38 AM, Stéphane Klein wrote:
> Le 26/07/2011 09:55, Stéphane Klein a écrit :
>> Hi,
>>
>> some time ago, someone ask how to get list of all objects which where
>> modified in a transaction :
>> http://article.gmane.org/gmane.comp.web.zop
It should be:
oldtid = f.read(8)
Of course, this needs to be verified with a test.
This seems to be a (obviously untested) case where
there are multiple records of a garbage object. I'll have to
ponder how this could actually happen.
Jim
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quot; magic string
for ZEO cache files. Not sure what the best description for that
might be. Maybe "Zope Object Database Client Cache File".
> Thanks for all your work,
Thanks for following up on this.
Jim
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EC3 Zope Object Database Client Cache File (data)
Question: What is the significance of "(data)"?
Jim
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2011/9/7 Stéphane Blondon :
> 2011/9/7 Jim Fulton :
>> 2011/9/6 Stéphane Blondon :
>> ...
>>> # Cache file for the database of Zope (done by ClientStorage)
>>> 0 string ZEC3 Zope Object Database Client Cache File (data)
>>
>> Question: Wha
a great place for someone to help out. :)
Just needs finishing IIRC. :)
...
> At this point I was able to start up the Pyramid ZODB scaffold and add
> an object to the DB root.
...
> That's as far as I got. Hope this is helpful to the next guy. :)
Very cool.
Jim
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lication, two persistet objects refer to the same non-persistent
object, after being stored and reloaded, they non-persistent object
will be duplicated and unshared.
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to keep old (unpacked) files. If set to False, the old file
will be automatically removed.
Jim
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On Tue, Sep 27, 2011 at 12:45 PM, Vincent Pelletier wrote:
> Le mardi 27 septembre 2011 12:47:42, Jim Fulton a écrit :
>> Generally speaking, clases and methods are not stored in the database,
>> only class names.
>
> (This mail is out of topic... Probably only inte
On Tue, Sep 27, 2011 at 2:26 PM, Stephan Richter
wrote:
...
> Also, how does the ZODB handle circular references within non-persistent
> objects? I assume pickle handles this?
Yes.
Jim
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Fo
, both of which I'd like to see.
svn+ssh://svn.zope.org/repos/main/ZODB/branches/jim-python-btrees
Jim
P.S. Much thanks to Tres for his work on the Python version of persistence.
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For
a namespace package.
Thoughts?
I'd have prefered "odb", but that's sort of taken.
Jim
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On Tue, Oct 4, 2011 at 11:36 AM, David Glick wrote:
> On 10/4/11 8:33 AM, Jim Fulton wrote:
>>
>> Someone recently told me I should be more agressive about asking for help.
>>
>> If someone is looking for an opportunity to help, finishing the Python
>> version of
On Tue, Oct 4, 2011 at 1:07 PM, David Glick wrote:
> On 10/4/11 9:59 AM, Jim Fulton wrote:
>>
>> Based on some discussions with Alan Runyan over the last few days,
>> I've created an oodb "package" as a namespace package:
>>
>> http://pypi.python.
On Tue, Oct 4, 2011 at 1:45 PM, Vincent Pelletier wrote:
> Le mardi 04 octobre 2011 18:59:32, Jim Fulton a écrit :
>> I've created an oodb "package" as a namespace package:
>
> Sounds good to me.
>
>> Thoughts?
>
> What would be the structure ?
First
On Wed, Oct 5, 2011 at 1:40 PM, Pedro Ferreira
wrote:
> Hello all,
>
> While doing some googling on ZEO + memcache I came across this:
>
> https://github.com/eleddy/zeo.memcache
Interesting. I'll review it.
Thanks for pointing it out.
Jim
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#x27;t think it
> would be very difficult. How many people would be interested in such a
> thing?
This would be of broad interest!
Can you briefly describe the strategy? How do you arrange that
the client sees a consistent view of the current tid
rk, even if the client
is read only. To get around this, we typically use a before storage,
which freezes the client storage at a point in time.
Jim
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modules. Is that at the
> moment possible running ZODB on .NET ironpython?!
As of now, there are some required C extensions. We're in the process
of trying to make these optional.
Jim
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For more i
On Thu, Oct 20, 2011 at 2:34 PM, Tamer Higazi wrote:
> You told amount of work had been done?!
Yes!!!
> In what stage are they now?!
They aren't done yet!!!
> Where can I get the latest informations according these cases?
Here. You just saw it. :)
Jim
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27;re used to.
If a performance is an issue, you may find yourself wanting to write
c# versions of these.
Jim
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On Wed, Oct 26, 2011 at 2:09 PM, Tamer Higazi wrote:
> dear Jim,
> Thank your for your quick answer.
>
> Am 26.10.2011 19:34, schrieb Jim Fulton:
>> On Wed, Oct 26, 2011 at 12:59 PM, Tamer Higazi wrote:
>>> Hey Jim!
>>> Hey just cool down.
>>
>>
[/usr/lib/python2.6/asyncore.py|recv|362]
> [/usr/lib/python2.6/asyncore.py|recv|588])
This looks like some sort of system problem, otherwise, I have no idea. :)
Jim
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.
>
> My question is: Will using transaction 'note' in a non-writing transaction
> cause a record to be written out when using FileStorage and/or ZEO?
No.
Jim
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For more infor
nnect-poll > >).
If there are no objections, I'll make this change in 3.11.
Jim
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e and lots of server
loads makes the server even more heavily loaded.
Jim
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On Sun, Dec 11, 2011 at 7:44 AM, Malthe Borch wrote:
> On 11 December 2011 13:22, Jim Fulton wrote:
...
> If it's in the disk cache, to my understanding, it might as well be in
> the ZEO client's pickle cache.
You mean the ZODB object cache?
Compressed pickles in the zeo cli
While
this is a backward incompatible change, I can't imagine unbroken code
that intentionally catches POSKeyErrors via KeErrors.
If there are no objections, I'll make this change in 3.11.
JIm
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> tom
>
> base = db.dataConn["1292289873"]["books"]["1292289873"]
What is db?
What version of ZODB are you using?
What Storage?
Jim
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thread is about Zope, not ZODB. Please move the discussion to zope-dev.
Jim
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structure
> that prevents zeopack to run correctly? There is no verbose mode with zeopack
> as far as I know that would provide me with more helpful information (like
> the transaction id?). Maybe I can use any of the other tools to get to the
> source of the problem?
>
> Any experi
,
>> > line 328, in findrefs
>> > return self.referencesf(self._file.read(dh.plen))
>> > File
>> > "/usr/local/lib/python2.6/dist-packages/ZODB3-3.10.3-py2.6-linux-i686.egg/ZODB/serialize.py",
>> >
On Tue, Feb 7, 2012 at 12:05 PM, Vincent Pelletier wrote:
> Le jeudi 16 décembre 2010 17:19:33, Jim Fulton a écrit :
>> Cool. I'll review this for 3.11 and it or somethink like it will go
>> into that release.
>
> bump :)
Um. Thanks.
Jim
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#x27;re packing all the storages together, presumably.
zeopack only works on a single storage and thus can't take
cross-database references into account.
See http://pypi.python.org/pypi/zc.zodbdgc
Perhaps this should be included in ZODB 3.11.
Jim
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r if it's not faster to ask the DB for an oid that is already in
> memory instead of retrieving it from the client cache?
In general, I'd say no. It can depend on lots of details, including:
- database size
- active set size
- network speed
- memory and disk speeds on clie
lly figure out how to use
memcached to implement a shared ZEO cache, as has been done
for relstorage.
At PyCon, I'll be presenting work I've been doing on a load
balancer that seeks to avoid sharing the same data in multiple
caches by assigning different kinds of work to different wor
I'm pretty happy with how zc.zlibstorage has worked out.
Should I build this into ZODB 3.11?
BTW, lz4 compression looks interesting.
The Python binding (at least from PyPI) is broken.
I submitted an issue. Hopefully it will be fixed.
Jim
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On Wed, Mar 14, 2012 at 7:46 PM, Stephan Richter
wrote:
> On Wednesday, March 14, 2012 01:47:54 PM Jim Fulton wrote:
>> I'm pretty happy with how zc.zlibstorage has worked out.
>>
>> Should I build this into ZODB 3.11?
>
> Hi Jim,
>
> I am +1 as well.
On Wed, Mar 14, 2012 at 1:47 PM, Jim Fulton wrote:
...
> BTW, lz4 compression looks interesting.
Mainly because it (claims that it) makes compression and
decompression much faster. While zlibstorage is a
significant net win, the cpu load it adds is noticeable.
> The Python binding (at
ZEO sometimes
didn't have it's own thread.
Remember that with multi-version concurrency control, you always
see the database as it was at the beginning of the transaction. If you
want to see updates, you need to start a new transaction.
Jim
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On Thu, Mar 15, 2012 at 11:09 AM, Jim Fulton wrote:
> On Wed, Mar 14, 2012 at 1:47 PM, Jim Fulton wrote:
...
> At some point soonish, I'll do some
> tests against a large database.
On a database with 180 million records, 150 million of which
are compressable:
ly retrying is fine.
If your application wants to update the same value from multiple
threads often, then that's a design problem you should solve.
Jim
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retry #.
I do plan to do this, um, when I get around to it. Might be a nice
small project for someone who wants to contribute.
The with statement is really wanting when you might want to execute
code other than once.
Jim
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On Wed, Mar 28, 2012 at 4:37 PM, Chris McDonough wrote:
> On Wed, 2012-03-28 at 14:21 -0400, Jim Fulton wrote:
...
> A decorator for running some code in the context of a txn and retrying
> retryable exceptions would be nice higher level behavior. Â I'd be
> willing to do th
On Thu, Mar 29, 2012 at 2:50 AM, Chris McDonough wrote:
> On Wed, 2012-03-28 at 18:37 -0400, Chris McDonough wrote:
>> On Wed, 2012-03-28 at 17:06 -0400, Jim Fulton wrote:
>> > On Wed, Mar 28, 2012 at 4:37 PM, Chris McDonough wrote:
>> > > On Wed, 2012-03-28 at
On Wed, Mar 28, 2012 at 6:37 PM, Chris McDonough wrote:
> On Wed, 2012-03-28 at 17:06 -0400, Jim Fulton wrote:
>> On Wed, Mar 28, 2012 at 4:37 PM, Chris McDonough wrote:
>> > On Wed, 2012-03-28 at 14:21 -0400, Jim Fulton wrote:
>> ...
>> > A decorator for runn
On Thu, Mar 29, 2012 at 6:59 PM, Chris McDonough wrote:
> On Thu, 2012-03-29 at 07:18 -0400, Jim Fulton wrote:
>> On Wed, Mar 28, 2012 at 6:37 PM, Chris McDonough wrote:
>> > On Wed, 2012-03-28 at 17:06 -0400, Jim Fulton wrote:
>> >> On Wed, Mar 28, 2012 at 4
level, rather than
going through ZODB. Alternatively, it would be nice to have a way to
get the S3 location for a blob. Maybe this could be done through some
extension API.
Jim
--
Jim Fulton
http://www.linkedin.com/in/jimfulton
Jerky is better than bacon! http://zo.pe/Kqm
_
ne ZODB database ?
It should be. If it isn't it's a bug.
>* Are there other, similar, facilities which would track change to
>application classes (or at least accept notifications of them) and
>automatically 'fixup' the corresponding classes already in the
&
h, if at all.
The strategy should provide greater transaction throughput and
reduce latency. It's a strategy I'd like to implement for ZEO at some
point.
Jim
--
Jim Fulton
http://www.linkedin.com/in/jimfulton
Jerky is better than bacon! http://zo.pe/Kqm
rk that way, since there's no relstorage
server.
Jim
--
Jim Fulton
http://www.linkedin.com/in/jimfulton
Jerky is better than bacon! http://zo.pe/Kqm
___
For more information about ZODB, see http://zodb.org/
ZODB-Dev mailing list - ZODB-Dev@zope
roject and that doesn't include ZEO.
- ZEO 4 (4.0.0a1 initially)
- ZODB3 3.11 (3.11.0.a1 initially) that depends on ZODB and ZEO and is
otherwise empty.
If there are no objections, I'll release these in a few days.
Jim
--
Jim Fulton
http://www.linkedin.com/in/jimfulton
Jerky is bet
On Sun, Oct 14, 2012 at 5:03 PM, Hanno Schlichting wrote:
> On Sun, Oct 14, 2012 at 10:21 PM, Jim Fulton wrote:
>> Goal: Give persistent, ZODB and ZEO their own release cycles.
>
> In which distribution would BTrees end up in?
Still ZODB.
> I think the pure-Python work fo
(I don't think
> anything depends on BTrees).
FileStorage uses BTrees for it's in-memory index.
MappingStorage used BTrees.
There are ZODB tests that use BTrees,
but I suppose they could be fixed.
I just don't think the win is that great
in separating BTrees at this time.
Ji
On Sun, Oct 14, 2012 at 6:07 PM, Laurence Rowe wrote:
> On 14 October 2012 22:49, Jim Fulton wrote:
>> On Sun, Oct 14, 2012 at 5:28 PM, Tres Seaver wrote:
>> ...
>>>> Well, I don't have time to chase BTrees. This could always be done in
>>>> ZODB 5.
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