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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1447) Make getGenerationStampFromFile() more efficient, so it doesn't reprocess full directory listing for every block
Date Mon, 17 Oct 2011 22:19:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13129259#comment-13129259
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Suresh Srinivas commented on HDFS-1447:
---------------------------------------

bq. I have created 10000 blocks and metafies in one directory.
In datanode storage directory, we typically have less than 100 block files. What kind of improvement
do we see for that?
                
> 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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