Todd Lipcon created HADOOP-15564:
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Summary: Classloading Shell should not run a subprocess
Key: HADOOP-15564
URL: https://issues.apache.org/jira/browse/HADOOP-15564
Project: Hadoop Common
Issue Type: Improvement
Components: util
Affects Versions: 3.0.0
Reporter: Todd Lipcon
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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