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  1. Hadoop HDFS
  2. HDFS-97

DFS should detect slow links(nodes) and avoid them

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None

      Description

      The current DFS does not detect slow links (nodes).
      Thus, when a node or its network link is slow, it may affect the overall system performance significantly.
      Specifically, when a map job needs to read data from such a node, it may progress 10X slower.
      And when a DFS data node pipeline consists of such a node, the write performance degrades significantly.
      This may lead to some long tails for map/reduce jobs. We have experienced such behaviors quite often.

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              • Assignee:
                Unassigned
                Reporter:
                runping Runping Qi
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                • Created:
                  Updated:
                  Resolved: