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Date: Tue, 16 Oct 2012 22:31:05 +0000 (UTC)
From: "Daryn Sharp (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-3990) NN's health report has severe
 performance problems
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     [ https://issues.apache.org/jira/browse/HDFS-3990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Attachment: HDFS-3990.patch

Track the peer name from the socket separately.
                
> 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: 0.23.0, 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HDFS-3990.patch, HDFS-3990.patch, HDFS-3990.patch, HDFS-3990.patch, hdfs-3990.txt
>
>
> 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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