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https://issues.apache.org/jira/browse/HADOOP-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raghu Angadi updated HADOOP-1453:
---------------------------------
Status: Patch Available (was: Open)
> 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, HADOOP-1453-02.patch,
> HADOOP-1453-02.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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