Get all accumulator updates from all tasks which belong to this execution and merge them.
Get all accumulator updates from all tasks which belong to this execution and merge them.
Update the accumulator values of a task with the latest metrics for this task.
Update the accumulator values of a task with the latest metrics for this task. This is called every time we receive an executor heartbeat or when a task finishes.
A SQLListener for rendering the SQL UI in the history server.