Thanks. I see. Found http://www.queryhome.com/45727/how-to-upgrade-from-hadoop-2-3-to-hadoop-2-4 to upgrade when stopped.
在 2014-06-24 02:04:19，"Stanley Shi" <s...@gopivotal.com> 写道： Cluster-running upgrade is only supported after 2.4, that is, upgrade from 2.4 to 2.4+ is supported; upgrading from 2.2 to 2.4 is not supported; Regards, Stanley Shi, On Fri, Jun 20, 2014 at 5:50 PM, Jason Meng <neu...@126.com> wrote: Hi, I setup Hadoop 2.2 cluster with NameNode HA. How to upgrade it to 2.4? I try to upgrade according to http://hadoop.apache.org/docs/r2.4.0/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html, but can't works. Is there a detailed step by step guide include when to shutdown namenode or when to change env variable like HADOOP_HOME in which step? There are two mode to upgrade, cluster running or cluster stopped. Either one is ok. Thanks. Regards, Jason
