Untangle depencencies between NN components
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Key: HDFS-2223
URL: https://issues.apache.org/jira/browse/HDFS-2223
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.23.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Working in the NN a lot for HA (HDFS-1623) I've come across a number of
situations where the tangled dependencies between NN components has been
problematic for adding new features and for testability. It would be good to
untangle some of these and clarify what the distinction is between the
different components: NameNode, FSNamesystem, FSDirectory, FSImage, NNStorage,
and FSEditLog
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