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From "Uma Maheswara Rao G (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1447) Make getGenerationStampFromFile() more efficient, so it doesn't reprocess full directory listing for every block
Date Fri, 14 Oct 2011 09:14:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G updated HDFS-1447:
--------------------------------------

    Attachment: HDFS-1447.patch
    
> Make getGenerationStampFromFile() more efficient, so it doesn't reprocess full directory
listing for every block
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1447
>                 URL: https://issues.apache.org/jira/browse/HDFS-1447
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node
>    Affects Versions: 0.20.2
>            Reporter: Matt Foley
>            Assignee: Matt Foley
>         Attachments: HDFS-1447.patch, Test_HDFS_1447_NotForCommitt.java.patch
>
>
> Make getGenerationStampFromFile() more efficient. Currently this routine is called by
addToReplicasMap() for every blockfile in the directory tree, and it walks each file's containing
directory on every call. There is a simple refactoring that should make it more efficient.
> This work item is one of four sub-tasks for HDFS-1443, Improve Datanode startup time.
> The fix will probably be folded into sibling task HDFS-1446, which is already refactoring
the method that calls getGenerationStampFromFile().

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