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

["Raghu Angadi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12504078 ] 

Raghu Angadi commented on HADOOP-1453:
--------------------------------------

I guess this is not enough. There is an exists() in ChecksumFileSystem.open() as well. Should that be removed as well? :

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

> exists() not necessary before DFS.open
> --------------------------------------
>
>                 Key: HADOOP-1453
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1453
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>             Fix For: 0.14.0
>
>         Attachments: HADOOP-1453-01.patch
>
>
> {code:title=DistributedFileSystem.java:131|borderStyle=solid}
> 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);
>  }
> {code}
> {{exists(f)}} adds extra namenode interaction that is not really required. Open is a critical DFS call.

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