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From "Steve Loughran (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7878) Regression HADOOP-7777 switch changes too clever for the StaticMapping
Date Fri, 02 Dec 2011 15:07:39 GMT
Regression HADOOP-7777 switch changes too clever for the StaticMapping
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                 Key: HADOOP-7878
                 URL: https://issues.apache.org/jira/browse/HADOOP-7878
             Project: Hadoop Common
          Issue Type: Bug
          Components: util
    Affects Versions: 0.23.0, 0.24.0
            Reporter: Steve Loughran
            Assignee: Steve Loughran


This doesn't show up until you apply the HDFS-2492 patch, but the attempt to make the {{StaticMapping}}
topology clever by deciding if it is single rack or multi rack based on its rack->node
mapping breaks the HDFS {{TestBlocksWithNotEnoughRacks}} test. Why? Because the racks go in
after the switch topology is cached by the {{BlockManager}}, which assumes the system is always
single-switch.

Fix: default to assuming multi-switch; remove the intelligence, add a setter for anyone who
really wants to simulate single-switch racks. 

Test: verify that a newly created simple mapping is multi switch

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