On 10/09/13 18:13, "Dr. André Lanka" wrote:
Hello Jena developers,
I know, you are working hard for the next Jena release. I just wanted to
let you know that I submitted a patch two weeks ago (JENA-524) It's
about a global cache that could be very useful if one's using many TDB
stores in direct file mode on a single machine. At least it's very
helpful for us and allows us to host more than five thousand tdb stores
(containing more than a billion triples) on a classical consumer PC. The
two main advantages for us are that
1. we can have concurrent write access to all the stores (what named
graphs don't provide).
2. we have a relatively small read cache of approx. 500 MB with a hit
rate of almost 99%.
3. Our JVM need approx. 2-3 GB of RAM for the whole system including TDB
access.
We will be very glad if you decide to integrate our approach to the
official release. So, if I can do something (provide further information
about the idea or something else) let me know. :)
Best wishes and thanks for the great piece of software you build
André
André - thank you for the contribution.
I hope interested user will take the patch, apply and build an
experimental system then provide feedback. It looks good and I would
like to understand the impact on all users. It may well make sense to
switch to only having per-JVM global caches as well as proper
configurability.
As we're approaching a release and this is a significant change, I
suggest we release in the current state then, with some clear space,
investigate integrating this patch.
Andy
