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  1. Hadoop HDFS
  2. HDFS-1094

Intelligent block placement policy to decrease probability of block loss

    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: namenode
    • Labels:
      None

      Description

      The current HDFS implementation specifies that the first replica is local and the other two replicas are on any two random nodes on a random remote rack. This means that if any three datanodes die together, then there is a non-trivial probability of losing at least one block in the cluster. This JIRA is to discuss if there is a better algorithm that can lower probability of losing a block.

        Attachments

        1. prob.pdf
          67 kB
          Aravind Menon
        2. prob.pdf
          67 kB
          Aravind Menon
        3. failure_rate.py
          11 kB
          Rodrigo Schmidt
        4. calculate_probs.py
          2 kB
          Rodrigo Schmidt

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              • Assignee:
                rschmidt Rodrigo Schmidt
                Reporter:
                dhruba dhruba borthakur
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                Dates

                • Created:
                  Updated: