[jira] [Created] (SPARK-37488) With enough resources, the task may still be permanently pending

["Yiqun Zhang (Jira)" <ji...@apache.org>]

Yiqun Zhang created SPARK-37488:
-----------------------------------

             Summary: With enough resources, the task may still be permanently pending
                 Key: SPARK-37488
                 URL: https://issues.apache.org/jira/browse/SPARK-37488
             Project: Spark
          Issue Type: Bug
          Components: Scheduler, Spark Core
    Affects Versions: 3.2.0, 3.1.2, 3.0.3
         Environment: Spark 3.1.2，Default Configuration
            Reporter: Yiqun Zhang


{code:java}
// The online environment is actually hive partition data imported to tidb, the code logic can be simplified as follows
    SparkSession testApp = SparkSession.builder()
        .master("local[*]")
        .appName("test app")
        .enableHiveSupport()
        .getOrCreate();
    Dataset<Row> dataset = testApp.sql("select * from default.test where dt = '20211129'");
    dataset.persist(StorageLevel.MEMORY_AND_DISK());
    dataset.count();
{code}

I have observed that tasks are permanently blocked and reruns can always be reproduced.

Since it is only reproducible online, I use the arthas runtime to see the status of the function entries and returns within the TaskSetManager.
https://gist.github.com/guiyanakuang/431584f191645513552a937d16ae8fbd

NODE_LOCAL level, because the persist function is called, the pendingTasks.forHost has a collection of pending tasks, but it points to the machine where the block of partitioned data is located, and since the only resource spark gets is the driver. In this case, it cannot be scheduled. getAllowedLocalityLevel gives the wrong runlevel, so it cannot be run with TaskLocality.Any

The task pending permanently because the scheduling time is very short and it is too late to raise the runlevel with a timeout.




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