Hadoop HDFS
  1. Hadoop HDFS
  2. HDFS-1729

Improve metrics for measuring NN startup costs.

    Details

    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Major Major
    • Resolution: Invalid
    • Affects Version/s: None
    • Fix Version/s: 0.20.203.0
    • Component/s: namenode
    • Labels:
      None

      Description

      Current logging and metrics are insufficient to diagnose latency problems in cluster startup. Add:
      1. better logs in both Datanode and Namenode for Initial Block Report processing, to help distinguish between block
      report processing problems and RPC/queuing problems;
      2. new logs to measure cost of scanning all blocks for over/under/invalid replicas, which occurs in Namenode just
      before exiting safe mode;
      3. new logs to measure cost of processing the under/invalid replica queues (created by the above mentioned scan), which
      occurs just after exiting safe mode, and is said to take 100% of CPU.

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          People

          • Assignee:
            Matt Foley
            Reporter:
            Owen O'Malley
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            Dates

            • Created:
              Updated:
              Resolved:

              Development