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From "Amareshwari Sri Ramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1898) locking for the ReflectionUtils.logThreadInfo is too conservative
Date Fri, 12 Oct 2007 12:56:50 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sri Ramadasu updated HADOOP-1898:
---------------------------------------------

    Attachment: patch-1898.txt

  I did the changes for locking ReflectionUtils. Here static synchronized method is replaced
by a method in a class object. This would not be conservative locking now.

> locking for the ReflectionUtils.logThreadInfo is too conservative
> -----------------------------------------------------------------
>
>                 Key: HADOOP-1898
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1898
>             Project: Hadoop
>          Issue Type: Bug
>          Components: util
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>         Attachments: patch-1898.txt
>
>
> When the RPC servers get into trouble with their call queues backing up, they occasionally
dump the call stacks. These are very useful for identifying hot spots, but the locking is
too conservative and so all of the handlers are blocked while the thread call stacks are dumped.

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