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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9857) Tests block and sometimes timeout on Windows due to invalid entropy source.
Date Fri, 09 Aug 2013 18:56:47 GMT
Chris Nauroth created HADOOP-9857:
-------------------------------------

             Summary: Tests block and sometimes timeout on Windows due to invalid entropy
source.
                 Key: HADOOP-9857
                 URL: https://issues.apache.org/jira/browse/HADOOP-9857
             Project: Hadoop Common
          Issue Type: Bug
          Components: build, test
    Affects Versions: 3.0.0, 2.1.1-beta
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth


Tests are configured to set the entropy source to {{file:///dev/urandom}} to prevent blocking
on machines with low entropy.  We've observed that on Windows, this will cause tests to block
for 5 seconds trying to access this non-existent path the first time the process does something
that needs entropy, such as using a {{SecureRandom}} or creating a {{UUID}}.  This can cause
tests to fail due to timeouts.  In addition to the initial 5-second blocking, this causes
the JVM to fall back to a slower, non-native seed generation implementation.

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