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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1558) Optimize FSNamesystem.startFileInternal
Date Fri, 28 Dec 2012 19:56:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-1558:
------------------------------

    Component/s: performance
                 namenode
    
> Optimize FSNamesystem.startFileInternal
> ---------------------------------------
>
>                 Key: HDFS-1558
>                 URL: https://issues.apache.org/jira/browse/HDFS-1558
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode, performance
>            Reporter: Dmytro Molkov
>            Assignee: Dmytro Molkov
>            Priority: Minor
>             Fix For: 0.24.0
>
>
> 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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