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https://issues.apache.org/jira/browse/HDFS-525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740348#action_12740348
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Suresh Srinivas commented on HDFS-525:
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Some bugs talking about the issues related to calling unsynchronized
SimpleDateFormat heavily:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6295722
We did see this exception after which the ListPathServlet stopped working.
> ListPathsServlet.java uses static SimpleDateFormat that has threading issues
> ----------------------------------------------------------------------------
>
> Key: HDFS-525
> URL: https://issues.apache.org/jira/browse/HDFS-525
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
>
> SimpleDateFormat is not thread safe. Multiple threads accessing the servlet
> can cause threading issues
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