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https://issues.apache.org/jira/browse/HDFS-12964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16315926#comment-16315926
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Yang Yun commented on HDFS-12964:
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the DFSSpinInputStream is only useful for special case. It will hang there when
read or seek file if it goes beyond the current EOF and the file is opened by
other.
The retry logic in DFSInputStream only try one more time, is different with the
hanging. I'm not sure if we can add a flag to switch the DFSInputStream to this
kind of behavior.
> Read a opened file timely and effectively when it's being written by other
> --------------------------------------------------------------------------
>
> Key: HDFS-12964
> URL: https://issues.apache.org/jira/browse/HDFS-12964
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Reporter: Yang Yun
> Priority: Minor
> Attachments: HADOOP-12964.001.patch
>
>
> One thread opens a HDFS file and keeps writing. Another thread opens same
> file and keeps reading it at the same time, also want to get the newest
> content of file. that happens in many environments, for example, in some
> message transmission applications. And it also requires the new content can
> be read timely and effectively, for there maybe many tasks are working in
> same time.
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