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  1. Hadoop Common
  2. HADOOP-15564

Classloading Shell should not run a subprocess

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 3.0.0
    • Fix Version/s: None
    • Component/s: util
    • Labels:
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      Description

      The 'Shell' class has a static member isSetsidSupported which, in order to initialize, forks out a subprocess. Various other parts of the code reference Shell.WINDOWS. For example, the StringUtils class has such a reference. This means that, during startup, a seemingly fast call like Configuration.getBoolean() ends up class-loading StringUtils, which class-loads Shell, which forks out a subprocess. I couldn't measure any big improvement by fixing this, but seemed surprising to say the least.

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            • Assignee:
              Unassigned
              Reporter:
              tlipcon Todd Lipcon
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              • Created:
                Updated: