Hi, We very much would like to see TDB2 incorporated into Jena as an option, especially for the online compaction. I spent a bit of time trying to build a fuseki-tdb2-war module but it will be much easier if TDB2 is incorporated into Jena (we deploy fuseki as war into tomcat rather than the fuseki-tbd2-server approach).
Thanks, Chris > On Sep 4, 2017, at 5:27 PM, Andy Seaborne <a...@apache.org> wrote: > > I'd like to offer TDB2 as a contribution to Apache Jena. > > It is by no means "finished" (is anything software ever finished?) but it is > sufficiently there to talk about and kick the tyres; I'll send notes about > the technical state of TDB2 separately in a moment. > > * It adds project overhead. The build is only a couple of minutes, including > upload time, (a lot of testing is done with in-memory databases, like TDB1, > which makes setup and teardown of tests much faster). However, more stuff in > the codebase is still more to get right for a release. > > * Support: while TDB2 works, it is unproven and rough round the edges > (unclear errors message, stacktraces rather than meaningful messages etc) and > questions/tickets may be quite hard to respond to (complex situations; no > track record of what's gone wrong before). Testing on MS Windows or macOS > has not been done. > > * Integration: It is not stable enough to be used in mainstream Fuseki2 as > the default persistent database. I see this as happening gradually. There is > a Fuseki+TDB2 jar built at the moment but you have to use configuration files > to setup the database. > > https://github.com/afs/mantis/blob/master/use-fuseki-tdb2.md > > * Initial status: I suggest we label it "incoming" or some such - it > would not hold up a release for example, and not everything might be fixed at > the point of a Jena release. It shouldn't stop the main code set that users > rely on getting out in the usual cycle. > > * Legal issues: the code has always been under the Apache License (original > work was done as part of grant from the UK gov which required open source > deliverables) but it would be simpler and cleaner for, e.g. moving or fixing > copyright/licence notices around, for there to be software grants. The two > parties involved are myself and Epimorphics Ltd. Both parties are willing to > submit the paperwork. > > * A project vote. This is a new set of modules so a formal, explicit vote > seems worthwhile. > > Thoughts, concerns, questions? > > Andy > > The code: > https://github.com/afs/mantis > (I can clean this up before integration as to what we agree on, so that there > is less noise and churn later). > > Builds: > org.seaborne.mantis:tdb2 > org.seaborne.mantis:fuseki-tdb2-server >
