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Tested to upgrade to 4.0


I tested to upgrade to Cassandra 4.0. I had an existing cluster with 3.0.15 and upgraded the first node but it fails to start due to a NullPointerException.

The problem is the new table option "speculative_write_threshold", when it doesn’t exist we get a NullPointerException.

I created a jira for this CASSANDRA-14820<>.