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From "Jiandan Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13984) getFileInfo of libhdfs call NameNode#getFileStatus twice
Date Fri, 02 Nov 2018 02:08:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jiandan Yang  updated HDFS-13984:
---------------------------------
    Attachment: HDFS-13984.002.patch

> getFileInfo of libhdfs call NameNode#getFileStatus twice
> --------------------------------------------------------
>
>                 Key: HDFS-13984
>                 URL: https://issues.apache.org/jira/browse/HDFS-13984
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: libhdfs
>            Reporter: Jiandan Yang 
>            Assignee: Jiandan Yang 
>            Priority: Major
>         Attachments: HDFS-13984.001.patch, HDFS-13984.002.patch
>
>
> getFileInfo in hdfs.c calls *FileSystem#exists* first, then calls *FileSystem#getFileStatus*.
 
> *FileSystem#exists* also call *FileSystem#getFileStatus*, just as follows:
> {code:java}
>   public boolean exists(Path f) throws IOException {
>     try {
>       return getFileStatus(f) != null;
>     } catch (FileNotFoundException e) {
>       return false;
>     }
>   }
> {code}
> and finally this leads to call NameNodeRpcServer#getFileInfo twice.
> Actually we can implement by calling once.



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