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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1447) Make getGenerationStampFromFile() more efficient, so it doesn't reprocess full directory listing for every block
Date Thu, 07 Oct 2010 22:57:31 GMT
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
             Fix For: 0.22.0


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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