bigdata

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Description
Please provide a clear and concise description of the problem. This should contain all the steps nee

What would you like to be added:

Task-level DAG scheduling policy

Why is this needed:

This feature provides the ability to customize the order in which tasks are launched

The following scenarios come to mind so far:

• mpi job. the master needs to wait for the worker to start before starting, If t

This is to track implementation of the ML-Features: https://spark.apache.org/docs/latest/ml-features

Bucketizer has been implemented in dotnet/spark#378 but there are more features that should be implemented.

• Feature Extractors
  • TF-IDF
  • Word2Vec (dotnet/spark#491)
  • CountVectorizer (https://github.com/dotnet/spark/p

especially for less obvious but lengthy code snippets!