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https://issues.apache.org/jira/browse/HADOOP-5823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raghu Angadi updated HADOOP-5823:
---------------------------------

    Attachment: HADOOP-5823.patch

Patch for the second option. FSEditLog.java is modified as a demo of the use 
case.

> Handling javac "deprecated" warning for using UTF8
> --------------------------------------------------
>
>                 Key: HADOOP-5823
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5823
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 0.20.0
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-5823.patch
>
>
> o.a.h.io.UTF8 is deprecated but is still used in multiple places. 
> FSEditLog.java has 40 UTF8 related warnings. I don't think it is feasible to 
> avoid using UTF8 in FSEditLog.java. 
> Two options to get rid of these warnings :
>   1. use @SupressWarnings at each use of UTF or for enclosing class.
>   2. define a wrapper class {{DeprecatedUTF8}} that is not {...@deprecated}}. 
> I prefer the second option in this case since it keeps FSEditLog.java and 
> other places clean and still makes it explicit that a deprecated class is 
> used.
> This is part of spring cleaning effort to remove warnings in javac. I will 
> attach a patch for the second option.

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