Ratandeep Ratti created YARN-2252:
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Summary: Intermittent failure for testcase
TestFairScheduler.testContinuousScheduling
Key: YARN-2252
URL: https://issues.apache.org/jira/browse/YARN-2252
Project: Hadoop YARN
Issue Type: Bug
Components: scheduler
Affects Versions: trunk-win
Reporter: Ratandeep Ratti
This test-case is failing sporadically on my machine. I think I have a
plausible explanation for this.
It seems that when the Scheduler is being asked for resources, the resource
requests that are being constructed have no preference for the hosts (nodes).
The two mock hosts constructed, both have a memory of 8192 mb.
The containers(resources) being requested each require a memory of 1024mb,
hence a single node can execute both the resource requests for the application.
In the end of the test-case it is being asserted that the containers (resource
requests) be executed on different nodes, but since we haven't specified any
preferences for nodes when requesting the resources, the scheduler (at times)
executes both the containers (requests) on the same node.
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