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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3510) Some FSEditLog pre-allocation problems in branch-1
Date Tue, 05 Jun 2012 22:16:24 GMT
Colin Patrick McCabe created HDFS-3510:

             Summary: Some FSEditLog pre-allocation problems in branch-1
                 Key: HDFS-3510
                 URL: https://issues.apache.org/jira/browse/HDFS-3510
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 1.0.0
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe
             Fix For: 1.0.0

In the FSEditLog, we want to avoid running out of space in the middle of writing an edit log
operation to the disk.  We do this by a process called "preallocation"-- reserving space on
the disk for the upcoming edit log entries before beginning to write them.

branch-1 has some major problems with the way it does preallocation.  These problems can lead
to corrupt edit logs when the disk runs out of space during an edit log sync operation.

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