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https://issues.apache.org/jira/browse/HDFS-5195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth updated HDFS-5195:
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Attachment: HDFS-5195.1.patch
Here is a patch to check for a null return value. While I was in this area, I
also fixed a potential file handle leak in the test code.
> 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
> Attachments: HDFS-5195.1.patch
>
>
> 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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