[HADOOP-1453] exists() not necessary before DFS.open

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.14.0
• Assignee: Raghu Angadi
• Reporter: Raghu Angadi
• Created: 01/Jun/07 23:24
• Updated: 08/Jul/09 16:42
• Resolved: 20/Jun/07 21:30

Description

DistributedFileSystem.java:131

public FSDataInputStream open(Path f, int bufferSize) throws IOException {
      if (!exists(f)) {
        throw new FileNotFoundException(f.toString());
      }

      return new DFSClient.DFSDataInputStream(dfs.open(getPath(f)), bufferSize);
 }

exists(f) adds extra namenode interaction that is not really required. Open is a critical DFS call.