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Posted to common-issues@hadoop.apache.org by "Junping Du (Commented) (JIRA)" <ji...@apache.org> on 2012/03/06 18:09:00 UTC

[jira] [Commented] (HADOOP-8144) pseudoSortByDistance in NetworkTopology doesn't work properly if no local node and first node is local rack node

    [ https://issues.apache.org/jira/browse/HADOOP-8144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223430#comment-13223430 ] 

Junping Du commented on HADOOP-8144:
------------------------------------

The patch fix the issue when there is no local node and local rack node is happen to be position 0. The updated Unit Test with testPseudoSortByDistance can show this fix.
                
> pseudoSortByDistance in NetworkTopology doesn't work properly if no local node and first node is local rack node
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8144
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8144
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.23.0, 1.0.0
>            Reporter: Junping Du
>            Priority: Minor
>         Attachments: HADOOP-8144-1.patch
>
>
> pseudoSortByDistance in NetworkTopology.java should sort nodes according to its distance with reader as local node, local rack node, ... 
> But if there is no local node with reader in nodes and the first node is local rack node with reader, then it will put a random node at position 0.

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