Lin Yiqun created HDFS-9951:
-------------------------------

             Summary: Improve the Node key definition in 
OfflineImageReconstructor
                 Key: HDFS-9951
                 URL: https://issues.apache.org/jira/browse/HDFS-9951
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Lin Yiqun
            Assignee: Lin Yiqun
            Priority: Minor


In class {{OfflineImageReconstructor}}, it uses many {{SectionProcessors}} to 
process xml files and load the subtree of the XML into a Node structure. But 
there are lots of places that node removes key by directively writing value in 
methods rather than define them first. Like this:
{code}
Node expiration = directive.removeChild("expiration");
{code}
We could improve this to define them in Node and them invoked like this way:
{code}
Node expiration=directive.removeChild(Node.CACHE_MANAGER_SECTION_EXPIRATION);
{code}
And it will be good to manager node key's name in the future.



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