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  1. Hadoop HDFS
  2. HDFS-2825

Add test hook to turn off the writer preferring its local DN

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Details

    • Improvement
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 0.23.0
    • 0.23.1
    • namenode
    • None
    • Reviewed

    Description

      Currently, the default block placement policy always places the first replica in the pipeline on the local node if there is a valid DN running there. In some network designs, within-rack bandwidth is never constrained so this doesn't give much of an advantage. It would also be really useful to disable this for MiniDFSCluster tests, since currently if you start a multi-DN cluster and write with replication level 1, all of the replicas go to the same DN.
      [per discussion below, this was changed to not add a config, but only to add a hook for testing]

      Attachments

        1. hdfs-2825.txt
          4 kB
          Todd Lipcon
        2. hdfs-2825.txt
          4 kB
          Todd Lipcon

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              tlipcon Todd Lipcon
              tlipcon Todd Lipcon
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                Created:
                Updated:
                Resolved: