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From "Jack Krupansky" <jack.krupan...@lucidimagination.com>
Subject Re: Derby
Date Thu, 03 Jun 2010 21:50:41 GMT
> (1)     You can't run more than one LCF process at a time.  That means you 
> need to either run the daemon or the crawler-ui web application, but you 
> can't run both at the same time.

How do you "Start" a crawl then if not in the web app which then starts the 
agent process crawling?

Thanks for all of this effort!

-- Jack Krupansky

--------------------------------------------------
From: <karl.wright@nokia.com>
Sent: Thursday, June 03, 2010 5:34 PM
To: <connectors-dev@incubator.apache.org>
Subject: Derby

> For what it's worth, after some 5 days of work, and a couple of schema 
> changes to boot, LCF now runs with Derby.
> Some caveats:
>
> (1)     You can't run more than one LCF process at a time.  That means you 
> need to either run the daemon or the crawler-ui web application, but you 
> can't run both at the same time.
> (2)     I haven't tested every query, so I'm sure there are probably some 
> that are still broken.
> (3)     It's slow.  Count yourself as fortunate if it runs 1/5 the rate of 
> Postgresql for you.
> (4)     Transactional integrity hasn't been evaluated.
> (5)     Deadlock detection and unique constraint violation detection is 
> probably not right, because I'd need to cause these errors to occur before 
> being able to key off their exception messages.
> (6)     I had to turn off the ability to sort on certain columns in the 
> reports - basically, any column that was represented as a large character 
> field.
>
> Nevertheless, this represents an important milestone on the path to being 
> able to write some kind of unit tests that have at least some meaning.
>
> If you have an existing LCF Postgresql database, you will need to force an 
> upgrade after going to the new trunk code.  To do this, repeat the 
> "org.apache.lcf.agents.Install" command, and the 
> "org.apache.lcf.agents.Register 
> org.apache.lcf.crawler.system.CrawlerAgent" command after deploying the 
> new code.  And, please, let me know of any kind of errors you notice that 
> could be related to the schema change.
>
> Thanks,
> Karl
>
>
> 

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