Refactor DN configuration variables out of DataNode class
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Key: HDFS-2562
URL: https://issues.apache.org/jira/browse/HDFS-2562
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Affects Versions: 0.24.0, 0.23.1
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Minor
Right now there are many member variables in DataNode.java which are just read
from configuration when the DN is started. Similar to what we did with
DFSClient, we should refactor them into a new DNConf class which can be passed
around - the motivation is to remove the many references we have throughout the
code that read package-protected members of DataNode and reduce the number of
members in DataNode itself.
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