I did some more tests with my particular schema/message structure:

A null text field inside a UDT instance does NOT yield tombstones.
A null map does NOT yield tombstones.
A null text field does yield tombstones.


Ralf

> On 24.03.2016, at 09:42, Ralf Steppacher <ralf.viva...@gmail.com> wrote:
> 
> I can confirm that if I send JSON messages that always cover all schema 
> fields the tombstone issue is not reported by Cassandra.
> So, is there a way to work around this issue other than to always populate 
> every column of the schema with every insert? That would be a pain in the 
> backside, really.
> 
> Why would C* not warn about the excessive number of tombstones if queried 
> from cqlsh?
> 
> 
> Thanks!
> Ralf
> 
> 
> 
>> On 23.03.2016, at 19:09, Robert Coli <rc...@eventbrite.com 
>> <mailto:rc...@eventbrite.com>> wrote:
>> 
>> On Wed, Mar 23, 2016 at 9:50 AM, Ralf Steppacher <ralf.viva...@gmail.com 
>> <mailto:ralf.viva...@gmail.com>> wrote:
>> How come I end up with that large a number of tombstones?
>> 
>> Are you inserting NULLs?
>> 
>> =Rob
>>  
> 

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