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https://issues.apache.org/jira/browse/HDFS-12964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16316150#comment-16316150
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Vinayakumar B commented on HDFS-12964:
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HDFS-6633 was created for the same purpose, but it was not pushed forward.
You can take a look at there as well.
Latest patch in HDFS-6633 exposes a method, {{pollnewData()}} by using which
reader can get to know about whether any new data is added or not. An external
wrapper can be used to make the blocking read.
> 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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