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[protege-discussion] Enable Journaling in Project Options
jonathan.carter at e-asolutions.com
Fri Apr 18 01:51:06 PDT 2008
Thanks very much for getting back to me, Tania.
This helps a lot. Thinking about it, from what you're saying going for
Journaling may not actually solve my problem (I really like the
Collaborative Protege stuff!) and I'd end up with another monster file
I was not aware of the delete all change instances feature on the
Changes Tab but I will certainly check that out. Thanks for that.
Hope your testing goes well on saving the annotations to the database
- looking forward to that! I'd be more than happy to try out the JAR
once you're happy with it for a bit of further testing etc.
Thanks again for your help
Jonathan Carter - Head of Technical Architecture
Enterprise Architecture Solutions Ltd
On 18 Apr 2008, at 07:57, Tania Tudorache wrote:
> Sorry I did not read this message before answering your more recent
> I see what the problem is. Indeed the annotation ontology becomes very
> large even with a moderate number of changes. I am not sure whether
> saw the new feature of the Changes Tab, that allows you to delete all
> change instances from a menu .
> I think the solution would be to store the changes ontology in a
> database, which I did not have time to implement yet, although I have
> promised this a longer time ago :) I was testing some code that would
> allow you to store the annotation ontology in a database. I still want
> to test, whether this fix will have an impact on performance. If
> everything goes fine, the fix will be available in the next beta
> I can also send you before that a jar that you can test.
> The journal is a very detailed log file that is not very easy to
> analyze, because it is at very low level. Some operations that a user
> sees as atomic, might be recorded as several smaller changes. The size
> of the journal file grows pretty quickly. Users may experience a slow
> down at write operations, although this may not be noticeable for
> UI operation.
> : http://protegewiki.stanford.edu/index.php/Changes_Tab
> Jonathan Carter wrote:
>> Hi everyone,
>> I've been trying to understand more about what the 'Enable
>> option in Project Configuration can do for me. I have found some
>> documentation of PromptTab that says that Prompt can use the
>> Journaling to show who has done what in a Project during a diff.
>> As some background to why I am looking at this - maybe it won't help
>> me - I am trying to find a way of controlling the amount of change
>> information that is being created in my Project.
>> Currently, I am using 'Track Changes' and Collaborative Protege
>> running on a server with a handful (around 3) concurrent users. The
>> project is using a MySQL database as the framestore and this is
>> working well. However, the annotations file for my project (that is
>> tracking all the detailed change history) is just that - a file. The
>> problem I am having is that I am getting a very large number changes
>> in my project and so in periods of high useage (the team using the
>> project all day making changes to the model, for example) my
>> annotations_ file can reach 4-5MB in a matter of a couple of days.
>> Because this is a file, it must be periodically saved and the
>> held in memory, so everything slows down as the file gets big. If I
>> let it get too big, I can get out of memory exceptions on the server,
>> which can really cause problems.
>> I may be seeing a slightly 'amplified' number of changes going into
>> the model because I am making extensive use of a slot widget that I
>> wrote that automatically names String slots based on patterns that
>> include the Browser text of other slots in an instance but the
>> would bite me at some point either way. Currently, I am regularly
>> archiving off the annotations project, purging the timestamps and
>> change instances and then continuing with a "purged" change history.
>> Ideally, if the annotations file could be stored in the database
>> instead of a file then the problem is more easily managed (and
>> purely about storage).
>> So, I'm wondering whether enabling journaling either on project would
>> give me the change log (so I can see who's made what change) or on
>> annotations file would improve the way that that is persisted.
>> Any information about what the purpose of the 'Enable Journaling'
>> option is and how it affects project storage would be gratefully
>> received. As would any suggestions/experience of managing the
>> annotations file when using the very useful Collaborative Protege
>> Thanks very much for your help
>> Jonathan Carter - Head of Technical Architecture
>> Enterprise Architecture Solutions Ltd
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