Details

    • Type: New Feature
    • Status: Resolved
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: None
    • Fix Version/s: 3.0.0
    • Component/s: fs, viewfs
    • Labels:
      None
    • Target Version/s:

      Description

      It would be useful if ViewFS had the ability to designate one FileSystem as a "primary"/"default" to fall back to in the case that an entry in the mount table is not found. Consider the situation when you have a mount table that looks like:

      /data -> hdfs://nn1/data
      /logs -> hdfs://nn1/logs
      /user -> hdfs://nn1/user
      /remote -> hdfs://nn2/remote
      

      nn1 here is being used as the primary, with a specific directory 'remote' being offloaded to another namenode. This works, but if we want to add another top-level directory to nn1, we have to update all of our client-side mount tables. Merge links (HADOOP-8298) could be used to achieve this but they do not seem to be coming soon; this special case of a default FS is much simpler - try to resolve through the VFS mount table, if not found, then resolve to the defaultFS.

      There is a good discussion of this at https://issues.apache.org/jira/browse/HADOOP-13055?focusedCommentId=15733822&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15733822

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              • Assignee:
                manojg Manoj Govindassamy
                Reporter:
                xkrogen Erik Krogen
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                • Created:
                  Updated:
                  Resolved: