[jira] [Created] (SPARK-3543) Write TaskContext in Java and expose it through a static accessor

["Patrick Wendell (JIRA)" <ji...@apache.org>]

Patrick Wendell created SPARK-3543:
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             Summary: Write TaskContext in Java and expose it through a static accessor
                 Key: SPARK-3543
                 URL: https://issues.apache.org/jira/browse/SPARK-3543
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
            Reporter: Patrick Wendell
            Assignee: Prashant Sharma


Right now we have these xWithContext methods and it's a bit awkward (for instance, we don't support accessing taskContext from a normal map or filter operation). I'd propose the following

1. Re-write TaskContext in Java - it's a simple class.
2. Have a static method `TaskContext.get()` which will return the current in-scope TaskContext. Under the hood this uses a thread local variable similar to SparkEnv that the Executor sets.
3. Deprecate all of the existing xWithContext methods.



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