Tested to upgrade to 4.0

Fri, 12 Oct 2018 04:22:14 -0700 

Hi,

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<https://issues.apache.org/jira/browse/CASSANDRA-14820>.

Regards,
Tommy

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