improve singleton handling in DataNode
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Key: HADOOP-3648
URL: https://issues.apache.org/jira/browse/HADOOP-3648
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Affects Versions: 0.19.0
Reporter: Steve Loughran
Priority: Minor
when a DataNode is constructed, it saves its identity to a static field:
datanodeObject=this;
1. there's no check on what if this is already set
2. when the datanode terminates, it may want to set this to null
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