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Posted to hdfs-dev@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2013/01/16 19:32:13 UTC

[jira] [Created] (HDFS-4410) BlockListAsLongs ctors produce corrupt block list

Daryn Sharp created HDFS-4410:
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             Summary: BlockListAsLongs ctors produce corrupt block list
                 Key: HDFS-4410
                 URL: https://issues.apache.org/jira/browse/HDFS-4410
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0
            Reporter: Daryn Sharp


{{BlockListAsLongs()}} and {{BlockListAsLongs(long[])}} produce invalid instances.  The former calls the latter with {{BlockListAsLongs(null)}}, which is internally short-circuited to create an internal {{blockList}} array that does not contain the sentinel delimiting block.  An assert in {{getNumberOfBlocks}} will trip, which also prevents the "empty" block list from being iterated.

Both ctors are present in the call tree for DN registration and block reports.  Either those code paths are never executed, or the exceptions are swallowed and go unnoticed.  I found it while writing unit tests.

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