The fundamental idea of MRv2 is to split up the two major functionalities of the JobTracker,
resource management
and job scheduling/monitoring, into separate daemons.
The idea is to have a
global ResourceManager (RM) and
per-application ApplicationMaster (AM).
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ambari-1.2.0-incubating-rc0 release candidate
http://incubator.apache.org/ambari/1.2.0/installing-hadoop-using-ambari/content/index.html
SVN source tag:
https://svn.apache.org/repos/asf/incubator/ambari/tags/release-1.2.0-rc0
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在資料丟失達一定比例的時候，
namenode會進入safemode。
這時候可以採用
hadoop dfsadmin -safemode leave
or
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