Marcel Reutegger wrote:
Ian Boston wrote:
So, if you have 50x200MB of Lucene index... for example.... and wanted
that to be accessible in a cluster environment, would Jackrabbit be a
good place to put those segments ?
just to clarify, would this lucene index be 'application data', which is
stored like regular content through the JCR api? Or do you mean the
jackrabbit internal lucene segments?
This is application data from JCR's point of view.
The big killer for Lucene is the ability to seek efficiently on the
central blob (I think), but presumably by choosing the right Binary
storage strategy that comes partially for free ?
Jackrabbit always copies a binary to a temp file or into memory when the
property value is accessed. That is, the seek would always be local. But
as I already mentioned in another thread, JCR does not support random
access on binary properties. A binary property returns a plain InputStream.
understood.
If this is the case, I could replace my, slightly odd, segment
distribution mechanism with Jackrabbit.
yes, you certainly get a couple of goodies you otherwise don't have.
e.g. observation on the index files ;)
Last question,
Is JCR-169 being actively worked on ?
It doesn't have a high priority, but we are working on it on a
conceptual level. discussions during coffee breaks, etc. Basically how
the problems stated in JCR-169 can be solved and what needs to be
changed in the core to implement the feature blocks in a clustered
environment.
Is there an area where another pair of hands would help... I would
like to be able to deploy Jackrabbit in a cluster.
One major area is how changes from one cluster node are distributed to
other cluster nodes. Giota implemented something like a prototype, but
I'm not sure what the current state is. See also this discussion:
http://thread.gmane.org/gmane.comp.apache.jackrabbit.devel/6935
Thank you for the pointer. I'll read it. There has been some use of
JGroups for cluster wide distribution of events.... but it might not
make sense here.
Or any other area mentioned in JCR-169, you can simply pick one ;)
Ok, when I get pressure to make it work in a cluster, I'll jump in.
Ian
regards
marcel
