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Posted to issues@spark.apache.org by "Yuechen Chen (JIRA)" <ji...@apache.org> on 2017/03/10 07:02:04 UTC

[jira] [Created] (SPARK-19894) Tasks entirely assigned to one executor on Yarn-cluster mode for default-rack

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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