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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2282) Semi-harmless race between block reports and block invalidation
Date Wed, 24 Aug 2011 02:53:29 GMT
Semi-harmless race between block reports and block invalidation
---------------------------------------------------------------

                 Key: HDFS-2282
                 URL: https://issues.apache.org/jira/browse/HDFS-2282
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 0.20.203.0
            Reporter: Todd Lipcon
         Attachments: hdfs-2282-20.txt

In the 0.20 codebase, block reports are not synchronized in any way against mutations to the
actual file structure on disk. If a file is removed from a directory while the block report
is scanning that directory, it will be mistakenly reported as existing with a length of 0,
since File.length() on a non-existent file returns 0.

This results in an error being logged on the DataNode when the NN sends it a second block
deletion request for the already-deleted block. I believe it to be harmless, but the error
message can concern users.

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