Github user tdas commented on the pull request: https://github.com/apache/spark/pull/8998#issuecomment-146016637 I strongly think that we should not add that require. It can break existing streaming applications very easily. People might be using dynamic allocation with direct kafka or kinesis or with anything + WAL, in which case it is fine to have dynamic allocation as the system will not loose data. Upgrading Spark will immediately break their application, and it might be hard to figure out the solution for disabling dynamic allocation in their setting. We have made mistakes in the past by throwing errors like this for usecases which we didnt think would be useful in production, and people have complained that it broke their testing stuff. See https://issues.apache.org/jira/browse/SPARK-8630 and discussion https://www.mail-archive.com/search?l=u...@spark.apache.org&q=subject:%22Re%5C%3A+QueueStream+Does+Not+Support+Checkpointing%22&o=newest&f=1 We must not break stuff. So I suggest this be turned into a warning. In that case we dont need a new configuration.
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