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From "Steve Loughran (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7878) Regression HADOOP-7777 switch changes too clever for the StaticMapping
Date Sat, 10 Dec 2011 17:19:40 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Steve Loughran updated HADOOP-7878:

    Attachment: HADOOP-7878.patch

looked at the javadocs; improved but no obvious reason for patch test failures; diffs don't
show any new warnings.
> Regression HADOOP-7777 switch changes too clever for the StaticMapping
> ----------------------------------------------------------------------
>                 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
>            Priority: Minor
>              Labels: regression
>         Attachments: HADOOP-7878.patch, HADOOP-7878.patch
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
> 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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