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Posted to hdfs-issues@hadoop.apache.org by "Chris Nauroth (JIRA)" <ji...@apache.org> on 2013/09/13 00:36:54 UTC

[jira] [Created] (HDFS-5195) Prevent passing null pointer to mlock and munlock.

Chris Nauroth created HDFS-5195:
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             Summary: Prevent passing null pointer to mlock and munlock.
                 Key: HDFS-5195
                 URL: https://issues.apache.org/jira/browse/HDFS-5195
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
    Affects Versions: HDFS-4949
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth


According to JNI documentation, it is optional for the JVM to support the {{GetDirectBufferAddress}} function.  If unsupported, then the function will return null.  This is probably a very rare thing, but let's be defensive by checking the return value for null and throwing an exception instead of passing null down to {{mlock}} and {{munlock}}.

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