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From "Jiandan Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13984) getFileInfo of libhdfs call NameNode#getFileStatus twice
Date Thu, 11 Oct 2018 07:07:00 GMT
Jiandan Yang  created HDFS-13984:
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             Summary: 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 


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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