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Date: Thu, 23 Dec 2010 12:50:46 -0500 (EST)
From: "Dmytro Molkov (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Created: (HDFS-1558) Optimize FSNamesystem.startFileInternal
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Optimize FSNamesystem.startFileInternal
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                 Key: HDFS-1558
                 URL: https://issues.apache.org/jira/browse/HDFS-1558
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Dmytro Molkov
            Assignee: Dmytro Molkov
            Priority: Minor
             Fix For: 0.23.0


Currently on file creation inside of FSNamesystem.startFileInternal there are three calls to FSDirectory that are essentially the same:

dir.exists(src)
dir.isDir(src)
dir.getFileInode(src)

All of them have to fetch the inode and then do some processing on it.
If instead we were to fetch the inode once and then do all of the processing on this INode object it would save us two trips through the namespace + 2 calls to normalizePath all of which are relatively expensive.

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