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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7370) Optimize pread on ChecksumFileSystem
Date Thu, 09 Jun 2011 07:53:58 GMT
Optimize pread on ChecksumFileSystem

                 Key: HADOOP-7370
                 URL: https://issues.apache.org/jira/browse/HADOOP-7370
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Minor
         Attachments: checksumfs-pread-0.20.txt

Currently the implementation of positional read in ChecksumFileSystem is verify inefficient
- it actually re-opens the underlying file and checksum file, then seeks and uses normal read.
Instead, it can push down positional read directly to the underlying FS and verify checksum.

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