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https://issues.apache.org/jira/browse/HDFS-12964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Yun updated HDFS-12964:
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Description: One thread opens a HDFS file and keep writing. Another thread
opens same file and keep reading it at the same time, also want to get the
newest content of file. that happens at 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. (was: One thread opens a HDFS file and keep writing. Another
thread opens same file and keep reading it at the same time, also want to get
the newest content of file. that happens at in many environments, for example,
talos message transmission. And it also requires the new content can be read
timely and effectively, for there maybe many tasks are working in same time.)
> 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: Critical
> Attachments: HADOOP-12964.001.patch
>
>
> One thread opens a HDFS file and keep writing. Another thread opens same
> file and keep reading it at the same time, also want to get the newest
> content of file. that happens at 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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