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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-870) Topology is permanently cached
Date Thu, 25 Feb 2010 23:32:28 GMT

    [ https://issues.apache.org/jira/browse/HDFS-870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838608#action_12838608

dhruba borthakur commented on HDFS-870:

Hi Koji, we do not use a external script to map Ip address to network topology. Instead we
have java code to map IP address to rack location. Don't you folks have jave code too?

> Topology is permanently cached
> ------------------------------
>                 Key: HDFS-870
>                 URL: https://issues.apache.org/jira/browse/HDFS-870
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Allen Wittenauer
> Replacing the topology script requires a namenode bounce because the NN caches the information
permanently.  It should really either expire it periodically or expire on -refreshNodes.

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