Re: Querying and caching with large datasets

From: Stefano Mazzocchi <>
Date: Sun, 12 Feb 2006 18:07:16 -0500

David Huynh wrote:
> Vineet pointed me to Retroweaver
> a 1.5 to 1.4 down compiler and I have been able to compile Sesame 2.0
> alpha 2 JARs down. I've tried using the retro JARs in a Firefox
> extension on the 1.5 JVM and they work fine.


turns out, on the other hand, that Java 1.5 on a mac is much more stable
than previously thought, since it was a problem with my new laptop
hardware (the second memory chip was defective).

But anyway, java 1.5 is not yet shipped on macosx so it's great to have
a way to downgrade sesame2.

> David
> Stefano Mazzocchi wrote:
>> David Huynh wrote:
>>> Jeen Broekstra wrote:
>>>> [snip]
>>>> Well, to be honest, we would of course encourage you to use Sesame 2,
>>>> since that is where your development can do the most good for us and
>>>> for
>>>> other Sesame users. Then again, you are more familiar probably with how
>>>> Sesame 1 works, and we still do plan to do a few Sesame 1.x releases.
>>>> Also, keep in mind that Sesame 2 is Java 5 only, which may be a problem
>>>> for you (I understand that for Piggybank it is a problem as MacOSX
>>>> still
>>>> does not ship with Java 5 per default).
>>> I'm very tempted to upgrade to Sesame 2 for Piggy Bank, too... All
>>> the new features of Sesame 2 are quite irresistible.
>> Agreed to the fact that Sesame 2 looks much more attractive than
>> Sesame 1 (also because of being, effectively, a quad store now), was
>> looking into it last night. I also like the notion of stackable
>> repositories a lot and a query caching layer makes perfect sense
>> (since we need it as well!)
>>> For MacOSX users of Piggy Bank, do you have any objection?... The
>>> Java Embedding Plugin for MacOSX supports Java 1.5 if you have Tiger:
>> ... but I have to be against this, at least for the trunk and for now.
>> java 1.5 on macosx is incredibly buggy, especially when coupled with
>> 10.4.4 (the latest update, never experienced so many OS/app crashes
>> since I hit update on that, grrr).
>> Also, users will have to be subscribed to the apple developer
>> connection to download it and install it, clearly not something that
>> we want our users to have to go thru.
>> Sure this yet another reason to decouple the javascript side of
>> piggybank from the java side and when that is done, I would be much
>> more inclined to migrate longwell over to Sesame 2, also because if we
>> run it on a server, we are very much likely to run it with java 1.5
>> with no big issues.
>> That said, running Sesame 2 on a mac is out of the picture right now
>> and I given the political friction between Apple and Sun, it might
>> take a long while to get a reasonable java 1.5 in every mac out there,
>> so we need to plan for that.

Stefano Mazzocchi
Research Scientist                 Digital Libraries Research Group
Massachusetts Institute of Technology            location: E25-131C
77 Massachusetts Ave                   telephone: +1 (617) 253-1096
Cambridge, MA  02139-4307              email: stefanom at mit . edu
Received on Sun Feb 12 2006 - 23:06:12 EST

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