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

["Chris Nauroth (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-5195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-5195 started by Chris Nauroth.

> 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, HDFS-5195.2.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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