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https://issues.apache.org/jira/browse/HDFS-12964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17085558#comment-17085558
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Yang Yun commented on HDFS-12964:
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Updated this Jira to new patch HDFS-12964.002.patch with following changes,
* Incorporate the retry logic in {{DFSInputStream}} rather than adding
{{DFSSpinInputStream}}
* Add a new API waitPosition(long position, long timeout) for this feature as
HDFS-6633 did.
> 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
> Assignee: Yang Yun
> Priority: Minor
> Attachments: HADOOP-12964.001.patch, HDFS-12964.002.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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