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From "hongbin ma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13179) TooRunner is not thread-safe because commons-cli OptionBuilder is not thread-safe
Date Thu, 19 May 2016 02:00:19 GMT
hongbin ma created HADOOP-13179:
-----------------------------------

             Summary: TooRunner is not thread-safe because commons-cli OptionBuilder is not
thread-safe
                 Key: HADOOP-13179
                 URL: https://issues.apache.org/jira/browse/HADOOP-13179
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: hongbin ma
            Priority: Minor


I'm running into similar issues like http://stackoverflow.com/questions/22462665/is-hadoops-toorunner-thread-safe,
the author's observation seem to make sense to me. However when I checked the hadoop github
trunk I found the issue still not fixed.

Chris Nauroth further investigated this issue, here's his quote: 

{quote}
The root cause is that commons-cli OptionBuilder is not thread-safe.

https://commons.apache.org/proper/commons-cli/apidocs/org/apache/commons/cl
i/OptionBuilder.html

According to this issue, commons-cli doesn't plan to change that and
instead chose to document the lack of thread-safety.

https://issues.apache.org/jira/browse/CLI-209

I think we can solve this in Hadoop, probably with a one-line change to
make GenericOptionsParser#buildGeneralOptions a synchronized method.
{quote}

I'll soon upload a patch for this



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