Hadoop 3.0.0-alpha1发布

Hadoop 3.0.0-alpha1已经发布了

http://hadoop.apache.org/release ... .0-alpha1+available


03 September, 2016: Release 3.0.0-alpha1 availableThis is the first alpha in a series of planned alphas and betas leading up to a 3.0.0 GA release. The intention is to "release early, release often" to quickly iterate on feedback collected from downstream users.
Please note that alpha releases come with no guarantees of quality or API stability, and are not intended for production use.
Users are encouraged to read the overview of major changes coming in 3.0.0. The full set of release notes and changelog detail all the changes since the previous minor release 2.7.0.

支持两个namenode

Support for more than 2 NameNodes.

The initial implementation of HDFS NameNode high-availability provided for a single active NameNode and a single Standby NameNode. By replicating edits to a quorum of three JournalNodes, this architecture is able to tolerate the failure of any one node in the system.

However, some deployments require higher degrees of fault-tolerance. This is enabled by this new feature, which allows users to run multiple standby NameNodes. For instance, by configuring three NameNodes and five JournalNodes, the cluster is able to tolerate the failure of two nodes rather than just one.

The HDFS high-availability documentation has been updated with instructions on how to configure more than two NameNodes.

网址发的不对，在这里补充一下，具体信息可以在以下网址看到
http://hadoop.apache.org/release ... .0-alpha1+available
http://hadoop.apache.org/docs/r3 ... S.3.0.0-alpha1.html
http://hadoop.apache.org/docs/r3.0.0-alpha1/index.html

进一步补充，hadoop更新说明翻译版
Apache Hadoop 3.0.0-alpha1版发布做了哪些改进
http://www.aboutyun.com/forum.php?mod=viewthread&tid=19809