Yuechen Chen created SPARK-19894:
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Summary: Tasks entirely assigned to one executor on Yarn-cluster
mode for default-rack
Key: SPARK-19894
URL: https://issues.apache.org/jira/browse/SPARK-19894
Project: Spark
Issue Type: Bug
Components: Scheduler, YARN
Affects Versions: 2.1.0
Environment: Yarn-cluster
Reporter: Yuechen Chen
In YARN-cluster mode, if driver has no rack information on two different hosts,
these two hosts would both be recoginized as "/default-rack", which may cause
some bugs.
For example, if hosts of one executor and one external datasource are unknown
by driver, this two hosts would be recoginized as the same rack
"/default-rack", and then all tasks would be assigned to the executor.
This bug would be avoided, if getRackForHost("unknown host") in YarnScheduler
returns None, not Some("/default-rack").
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