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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-525) ListPathsServlet.java uses static SimpleDateFormat that has threading issues
Date Thu, 27 Aug 2009 17:48:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748471#action_12748471
] 

Chris Douglas commented on HDFS-525:
------------------------------------

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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