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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9857) Tests block and sometimes timeout on Windows due to invalid entropy source.
Date Fri, 09 Aug 2013 21:38:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13735341#comment-13735341
] 

Arpit Agarwal commented on HADOOP-9857:
---------------------------------------

+1 for the updated patch pending +1 from Jenkins.

Thanks for adding the comment.
                
> 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
>         Attachments: HADOOP-9857.1.patch, HADOOP-9857.2.patch
>
>
> 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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