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  1. Hadoop Common
  2. HADOOP-10755

Support negative caching of user-group mapping

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 2.2.0
    • 2.6.0
    • security
    • None

    Description

      We've seen a situation at a couple of our customers where interactions from an unknown user leads to a high-rate of group mapping calls. In one case, this was happening at a rate of 450 calls per second with the shell-based group mapping, enough to severely impact overall namenode performance and also leading to large amounts of log spam (prints a stack trace each time).

      Let's consider negative caching of group mapping, as well as quashing the rate of this log message.

      Attachments

        1. HADOOP-10755.000.patch
          9 kB
          Lei (Eddy) Xu
        2. HADOOP-10755.001.patch
          9 kB
          Lei (Eddy) Xu
        3. HADOOP-10755.002.patch
          10 kB
          Lei (Eddy) Xu
        4. HADOOP-10755.003.patch
          16 kB
          Lei (Eddy) Xu
        5. HADOOP-10755.004.patch
          16 kB
          Lei (Eddy) Xu
        6. HDFS-5369.000.patch
          9 kB
          Lei (Eddy) Xu

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              eddyxu Lei (Eddy) Xu
              andrew.wang Andrew Wang
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              Dates

                Created:
                Updated:
                Resolved: