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Posted to common-dev@hadoop.apache.org by "Steve Loughran (Created) (JIRA)" <ji...@apache.org> on 2011/12/02 16:07:39 UTC
[jira] [Created] (HADOOP-7878) Regression HADOOP-7777 switch
changes too clever for the StaticMapping
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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