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getpwuid_r is not thread-safe
More info here: http://rhn.redhat.com/errata/RHSA-2011-0560.html and here: https://issues.apache.org/jira/browse/HADOOP-7156
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More info here: http://rhn.redhat.com/errata/RHSA-2011-0560.html and here: https://issues.apache.org/jira/browse/HADOOP-7156