Some lesson learn during 2.x. WebHDFS, HDFS ACL, QJM HA, rolling upgrade
are great features. Mapreduce 1.x uses resources more efficiently,
containers have rigid constraint, and applications get killed prematurely.
When a node has a lot of containers, YARN takes significant amount of
system
[
https://issues.apache.org/jira/browse/HADOOP-10980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ted Yu resolved HADOOP-10980.
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Resolution: Cannot Reproduce
Hadoop-Common-trunk has been green for a while.
TestActiveStandbyElector
