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https://issues.apache.org/jira/browse/HADOOP-10938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14195829#comment-14195829
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stack commented on HADOOP-10938:
--------------------------------

I think this issue is going in the wrong direction.  PositionedReadable should 
be thread-safe.  It has been claimed so since its beginnings and on the 
canonical implementation, HDFS, it has always been if not very 'live'.  Rather, 
I'd suggest we mark implementations that are not thread-safe at fault and fix 
or undo their PositionedReadable claims if they can't positioned read in a 
thread-safe way.

> Remove thread-safe description in PositionedReadable javadoc
> ------------------------------------------------------------
>
>                 Key: HADOOP-10938
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10938
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 2.6.0
>            Reporter: Yi Liu
>            Assignee: Yi Liu
>         Attachments: HADOOP-10938.001.patch
>
>
> According to discussion in HDFS-6813, we may need to remove thread-safe 
> description in PositionedReadable javadoc, since DFSInputStream, 
> WebhdfsFileSystem#inputStream, HarInputStream don't implement them with 
> thread-safe.



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