Aaron: I found an interesting concept when I read the code: locality group Can you say a little more about this feature ?
Thanks On Wed, Nov 14, 2012 at 2:18 PM, Aaron Kimball <[email protected]> wrote: > HBase fans, > > I’m writing to announce the first release of KijiSchema, a new project to > help developers build applications on HBase. You can download it at > www.kiji.org. It is open source and published under the Apache 2 license. > > KijiSchema simplifies the development of applications on HBase by providing > developer-friendly Java APIs for storing and managing typed data using > Avro. > > As an application grows, developers can gracefully evolve the application > schema at the cell level to handle new fields. These features are > particularly well suited for entity-centric data schemas where all > information about a given entity, including dimensional and transaction > data, is encoded within the same row. > > Column names and associations of columns with schemas are maintained in a > data dictionary; developers don’t need to rely on reading source code to > remember where data is stored. > > Table schemas can be defined in JSON or by using KijiSchema’s declarative > DDL. Developers can also easily run MapReduce over Kiji tables in HBase > using included MR Input- and OutputFormats. > > KijiSchema is an open and highly modular system. It runs on top of an > existing HBase 0.92 (CDH4) cluster, and can be run entirely on the client > with no server-side daemons. KijiSchema can also be downloaded as part of a > Kiji BentoBox, which provides a clean install of a mini-cluster of Hadoop, > HBase and Kiji on your laptop in under 15 min. You do not need to have > Hadoop or HBase pre-installed to run the BentoBox. > > KijiSchema is inspired by work we have done at WibiData developing > applications for recommendations and personalization on top of HBase. We > will be developing and releasing other components into the Kiji project to > provide additional functionality enabling easy development of data > applications on HBase, including improvements for MapReduce support and > querying tools. We welcome feedback and contributions from the community to > the Kiji Project at www.kiji.org. > > Regards, > - Aaron Kimball >
