[jira] [Created] (HDFS-6061) Allow dfs.datanode.shared.file.descriptor.path to contain multiple entries and fall back when needed

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

Colin Patrick McCabe created HDFS-6061:
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             Summary: Allow dfs.datanode.shared.file.descriptor.path to contain multiple entries and fall back when needed
                 Key: HDFS-6061
                 URL: https://issues.apache.org/jira/browse/HDFS-6061
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode
    Affects Versions: 2.4.0
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


In {{SharedFileDescriptorFactory}}, it would be nice if dfs.datanode.shared.file.descriptor.path could contain multiple entries and allow fallback between them.  That way, if a user doesn't have {{/dev/shm}} configured (the current default), the user could use {{/tmp}}.  This is mainly a concern on BSDs and some other systems where {{/dev/shm}} doesn't exist.



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