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https://issues.apache.org/jira/browse/HDFS-525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748471#action_12748471
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Chris Douglas commented on HDFS-525:
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ThreadLocalDateFormat and SimpleDateFormat are not related types. It's an odd
pattern because the ThreadLocalDateFormat serves no purpose; it's a wrapper for
a wrapper. As in the attached patch, there aren't many places where changes are
required.
> 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
> Components: name-node
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Fix For: 0.20.1, 0.21.0
>
> Attachments: HDFS-525.1.patch, HDFS-525.2.patch, HDFS-525.patch,
> HDFS-525.patch, HDFS-525.rel20.patch, HDFS.525-3.patch
>
>
> SimpleDateFormat is not thread safe. Multiple threads accessing the servlet
> can cause threading issues
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