Hadoop HDFS
  1. Hadoop HDFS
  2. HDFS-3544

Ability to use SimpleRegeratingCode to fix missing blocks

        Details

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

          Description

          ReedSolomon encoding (n, k) has n storage nodes and can tolerate n-k failures. Regenerating a block needs to access k blocks. This is a problem when n and k are large. Instead, we can use simple regenerating codes (n, k, f) that does first does ReedSolomon (n,k) and then does XOR with f stripe size. Then, a single disk failure needs to access only f nodes and f can be very small.

            Issue Links

            depends upon

            Improvement - An improvement or enhancement to an existing feature or task. HDFS-3543 Refactor Raid so it can work better with new erasure codes

            • Major - Major loss of function.
            • Resolved

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                People

                • Assignee:
                  Unassigned
                  Reporter:
                  dhruba borthakur
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                  Dates

                  • Created:
                    Updated:

                    Development