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Some news from dCache

Learn about the new dCache xrootd plugins for authentication, authorization, and name-space mapping, as well as the xrootd4j library, a pure Java implementation of the xrootd protocol. Easy to deploy and test, these advancements enhance dCache's xrootd support.

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Some news from dCache

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  1. Some news from dCache Paul Millar on behalf of the dCache team

  2. Outline • Something new, part 1 • Something new, part 2 • Summary

  3. Something new, part 1 • dCache xrootd support has two parts: • The core xrootd protocol support (stable) • Adaptation around xrootd (rapidly changing) e.g.: • ALICE provide token information for authentication • Federated namespace require VO-specific name-space mappings • dCache's xrootd support is monolithic: • Difficult for people to help or “take joint-ownership” of getting things working. • Updates of the “rapidly changing” part linked to dCache release cycles.

  4. Something new: plugins • Introducing plugins for dCache's xrootd. • Two kinds of plugins: • Authentication • Authorisation and name-space mapping. • Deployment is simple: drop in a single jar file • Plugins use normal dCache configuration • We have moved existing source code to public repo, • we continue to maintain this code … but we welcome help • Anyone can create their own plugins • What about testing all this? ...

  5. Something new, part 2 • We are currently restructuring dCache source code • Moving to maven • Splintering dCache into (many) small, reusable modules • Some of these will live outside dCache, … encouraging reuse. • Introducing ... xrootd4j

  6. Something new: xrootd4j • dCache's xrootd support as a library • Pure Java implementation of xrootd protocol(now with plugin support) • Written using Netty: a high-performance IOframework from JBoss • Runs on any platform that supports a Java Virtual Machine (i.e., any platform) • Located in a public github repository: https://github.com/gbehrmann/xrootd4j • Available under an open-source licence (LGPL) • Comes with example, working stand-alone server

  7. Xrootd4j: getting started • Three steps: • Check out: git clone git://github.com/gbehrmann/xrootd4j.git • Compile: cd xrootd4j; mvn package • Run: java -jar xrootd-standalone/target/xrootd4j-standalone-1.0.SNAPSHOT-jar-with-dependencies.jar • Congratulations: you have a running xrootd server, serving the local filesystem

  8. What next? • Releasing xrootd4j v1.0 • Pushing release into public maven repo • Projects can use this to pull in xrootd support • dCache will be doing this • Use as a basis for plugin development • Easy to deploy • Easy to test a dCache plugin • Used in new xrootd projects

  9. Summary • dCache now supports xrootd plugins • dCache's xrootd protocol support now an external library: xrootd4j • Provide a stand-along server to allow easy testing

  10. Thanks

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