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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, 
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.  
(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 happen at in many environments, for example, talos message 
transmission. And it also require 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, 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.



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