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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:
-----------------------------
Description:
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 StandbyException 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.
was:
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.
> [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 StandbyException 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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