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https://issues.apache.org/jira/browse/HDFS-5195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13765966#comment-13765966
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Chris Nauroth commented on HDFS-5195:
-------------------------------------
Relevant JNI documentation is here:
http://docs.oracle.com/javase/6/docs/technotes/guides/jni/spec/functions.html#GetDirectBufferAddress
> 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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