[HDFS-13984] getFileInfo of libhdfs call NameNode#getFileStatus twice

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Component/s: libhdfs
• Assignee: Jiandan Yang
• Reporter: Jiandan Yang
• Created: 11/Oct/18 07:06
• Updated: 25/Jun/19 00:00

Description

getFileInfo in hdfs.c calls FileSystem#exists first, then calls FileSystem#getFileStatus.

FileSystem#exists also call FileSystem#getFileStatus, just as follows:

  public boolean exists(Path f) throws IOException {
    try {
      return getFileStatus(f) != null;
    } catch (FileNotFoundException e) {
      return false;
    }
  }

and finally this leads to call NameNodeRpcServer#getFileInfo twice.
Actually we can implement by calling once.

Issue Links

• is related to: HDFS-14047 [libhdfs++] Fix hdfsGetLastExceptionRootCause bug in test_libhdfs_threaded.c