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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4452) getAdditionalBlock() can create multiple blocks if the client times out and retries.
Date Tue, 29 Jan 2013 19:47:13 GMT
Konstantin Shvachko created HDFS-4452:
-----------------------------------------

             Summary: getAdditionalBlock() can create multiple blocks if the client times
out and retries.
                 Key: HDFS-4452
                 URL: https://issues.apache.org/jira/browse/HDFS-4452
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.2-alpha
            Reporter: Konstantin Shvachko
            Assignee: Konstantin Shvachko
            Priority: Critical


HDFS client tries to addBlock() to a file. If NameNode is busy the client can timeout and
will reissue the same request again. The two requests will race with each other in {{FSNamesystem.getAdditionalBlock()}},
which can result in creating two new blocks on the NameNode while the client will know of
only one of them. This eventually results in {{NotReplicatedYetException}} because the extra
block is never reported by any DataNode, which stalls file creation and puts it in invalid
state with an empty block in the middle.

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