We are running Cassandra: 2.1.15, We started noticing below errors, app is 
writing larger mutations and before we take a route of increasing from 32MB to 
64MB for `commitlog_segment_size_in_mb` wanted to understand if there are any 
cons by increasing it. Do we need to tweak any other parameters as a result to 
this change ? 


Caused by: java.lang.IllegalArgumentException: Mutation of 19019986 bytes is 
too large for the maximum size of 16777216
        at org.apache.cassandra.db.commitlog.CommitLog.add(CommitLog.java:221) 
~[apache-cassandra-2.1.15.jar:2.1.15]
        at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:379) 
~[apache-cassandra-2.1.15.jar:2.1.15]```

Thanks for your time... 

Thanks 
Murali Gutha

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