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https://issues.apache.org/jira/browse/HADOOP-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-7878:
-----------------------------------
Resolution: Fixed
Fix Version/s: 0.23.1
0.24.0
Target Version/s: 0.24.0, 0.23.1 (was: 0.23.1, 0.24.0)
Status: Resolved (was: Patch Available)
Left the (now mostly redundant) tests in place just for regression testing
> Regression HADOOP-7777 switch changes break HDFS tests when the
> isSingleSwitch() predicate is used
> --------------------------------------------------------------------------------------------------
>
> 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
> Fix For: 0.24.0, 0.23.1
>
> 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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