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https://issues.apache.org/jira/browse/HDFS-14870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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huhaiyang updated HDFS-14870:
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Attachment: (was: test_case)
> [SBN read] Client Settings to ObserverReadProxyProvider read a file request,
> due to the file atime time needs to be modified, lead to request to be
> processed twice
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14870
> URL: https://issues.apache.org/jira/browse/HDFS-14870
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 2.10.0, 3.3.0, 3.2.1
> Reporter: huhaiyang
> Priority: Major
> Attachments: test_case
>
>
> Client Settings agent refers to ObserverReadProxyProvider class, read the RPC
> request will be forwarded to the ONN, but involves the need to modify the
> file, the request will be processed twice, cause the request time is too long;
> When ONN received from the client to read a file, will call FSNamesystem
> getBlockLocations method to get the list of file information, and the current
> atime decided the current file needs to be updated
> (dfs.namenode.accesstime.precision, HDFS file access time is accurate, The
> default value is 1 hour）. The ONN node does not currently support write
> operations. This logic throws an alternate exception, and the client retries
> the RPC request and forwards it to ANN for execution. As a result, the
> current file getBlockLocations method will be called twice, lengthening the
> entire RPC request.
>
>
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