Apache Hadoop 2.2.0 稳定版发布了,建议用户升级。该版本更加稳定,同时在 API 和协议上兼容老的版本。
与 Hadoop 1.x 比较,该版本显著的改进包括:
YARN - A general purpose resource management system for Hadoop to allow MapReduce and other other data processing frameworks and services
High Availability for HDFS
HDFS Federation
HDFS Snapshots
NFSv3 access to data in HDFS
Support for running Hadoop on Microsoft Windows
Binary Compatibility for MapReduce applications built on hadoop-1.x
Substantial amount of integration testing with rest of projects in the ecosystem
升级到 Hadoop 2.2.0 需要注意的有:
HDFS - The HDFS community decided to push the symlinks feature out to a future 2.3.0 release and is currently disabled.
YARN/MapReduce - Users need to change ShuffleHandler service name from mapreduce.shuffle to mapreduce_shuffle.
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2013-10-16