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https://issues.apache.org/jira/browse/HADOOP-6497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801894#action_12801894
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Doug Cutting commented on HADOOP-6497:
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A constructor that takes a FileContext and a Path would be useful.  It would 
get the file's length with FileContext#getStatus(Path), then open it with 
FileContext#open(Path), since almost every user of this class will need to do 
this.  This would also simplify the unit test a bit, making it a better example 
of how this is expected to be used.

> Introduce wrapper around FSDataInputStream providing Avro SeekableInput 
> interface
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-6497
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6497
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>         Attachments: HADOOP-6497.patch
>
>
> Reading data from avro files requires using Avro's SeekableInput interface; 
> we need to be able to wrap FSDataInputStream in this interface.

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