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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3990) NN's health report has severe performance problems
Date Fri, 12 Oct 2012 19:45:03 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daryn Sharp updated HDFS-3990:
------------------------------

    Target Version/s: 2.0.2-alpha, 0.23.4, 3.0.0  (was: 0.23.4, 3.0.0, 2.0.2-alpha)
              Status: Patch Available  (was: Open)
    
> NN's health report has severe performance problems
> --------------------------------------------------
>
>                 Key: HDFS-3990
>                 URL: https://issues.apache.org/jira/browse/HDFS-3990
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HDFS-3990.patch
>
>
> The dfshealth page will place a read lock on the namespace while it does a dns lookup
for every DN.  On a multi-thousand node cluster, this often results in 10s+ load time for
the health page.  10 concurrent requests were found to cause 7m+ load times during which time
write operations blocked.

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