Chenxiao Mao created SPARK-26939:
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             Summary: Fix some outdated comments about task schedulers
                 Key: SPARK-26939
                 URL: https://issues.apache.org/jira/browse/SPARK-26939
             Project: Spark
          Issue Type: Documentation
          Components: Spark Core
    Affects Versions: 2.4.0
            Reporter: Chenxiao Mao


Some comments about task schedulers are outdated. They should be fixed.

* TaskScheduler comments: currently implemented exclusively by 
  org.apache.spark.scheduler.TaskSchedulerImpl. This is not true as of now.
* YarnClusterScheduler comments: reference to ClusterScheduler which is not 
used anymore.
* TaskSetManager comments: method statusUpdate does not exist as of now.



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