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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5208) Only clear network location cache on specific nodes if invalid NetworkTopology happens
Date Fri, 20 Sep 2013 15:27:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773076#comment-13773076
] 

Junping Du commented on HDFS-5208:
----------------------------------

Filed HDFS-5237 to track node registration name issue and upload with a demo patch. However,
as demo patch shows, lots of tests are affected by ignoring specified host name in MiniDFSCluster.
Hi [~cmccabe], from your above comments it seems that we had some discussions before on fake
up having different hostnames in simpler ways. It is great if you can share more info on this.
                
> Only clear network location cache on specific nodes if invalid NetworkTopology happens
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-5208
>                 URL: https://issues.apache.org/jira/browse/HDFS-5208
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: HDFS-5208-v1.patch
>
>
> After HDFS-4521, once a DN is registered with invalid networktopology, all cached rack
info in DNSToSwitchMapping will be cleared. We should only clear cache on specific nodes.

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