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From "Hadoop QA (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 21:56:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13735371#comment-13735371
] 

Hadoop QA commented on HADOOP-9857:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12597177/HADOOP-9857.2.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/2956//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/2956//console

This message is automatically generated.
                
> 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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