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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