LantaoJin commented on issue #23951: [SPARK-13704][CORE][YARN] Re-implement RackResolver to reduce resolving time URL: https://github.com/apache/spark/pull/23951#issuecomment-475470622 > The failure (in [`org.apache.spark.scheduler.TaskSchedulerImplSuite`"SPARK-16106 locality levels updated if executor added to existing host"](https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/103786/testReport/junit/org.apache.spark.scheduler/TaskSchedulerImplSuite/SPARK_16106_locality_levels_updated_if_executor_added_to_existing_host/)) is probably real (you might just need to update the test assertions). That's because I changed the behavior or `getRackForHost`. The original returns `None` by default. Now it returns string "unknown". @squito Should I keep current behavior or recover to the original behavior?
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