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From "Lin Yiqun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9951) Use string constants for XML tags in OfflineImageReconstructor
Date Tue, 22 Mar 2016 02:01:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15205621#comment-15205621
] 

Lin Yiqun commented on HDFS-9951:
---------------------------------

Thanks [~cmccabe] for commit!

> Use string constants for XML tags 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
>             Fix For: 2.8.0
>
>         Attachments: HDFS-9551.001.patch, HDFS-9551.002.patch, HDFS-9551.003.patch, HDFS-9551.004.patch
>
>
> 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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