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https://issues.apache.org/jira/browse/CASSANDRA-6147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13924524#comment-13924524
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Tyler Hobbs commented on CASSANDRA-6147:
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Ah, yes, it looks like Thrift automatically makes all method arguments 
required.  (It emits the warning "optional keyword is ignored in argument 
lists" when you run gen-thrift-*.)  Using None or an empty string also doesn't 
work in python.

We can't make the timestamp optional for remove(), but it would still work for 
Deletion objects.  I'm not a fan of partial support for features, but I believe 
almost all Thrift clients use batch_mutate() + Deletions instead of remove() 
(which is extremely limited).  So, I suppose nearly-complete support of 
optional timestamps is better than only having optional timestamps for inserts 
and no support at all for deletes.

> Allow Thrift opt-in to server-side timestamps
> ---------------------------------------------
>
>                 Key: CASSANDRA-6147
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6147
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API
>            Reporter: Edward Capriolo
>            Assignee: Edward Capriolo
>            Priority: Minor
>             Fix For: 2.1 beta2
>
>
> Thrift users are still forced to generate timestamps on the client side. 
> Currently the way the thrift bindings are generated users are forced to 
> supply timestamps. There are two solutions I see.
> * -1 as timestamp means "generate on the server side"
> This is a breaking change, for those using -1 as a timestamp (which should 
> effectively be no one.
> * Prepare yourself....
> Our thrift signatures are wrong, you can't overload methods in thrift
> thrift.get(byte [], byte[], ts) 
> should REALLY be changed to 
> GetRequest g =  new GetRequest()
> g.setName()
> g.setValue()
> g.setTs() ///optional 
> thrift. get( g )
> I know no one is going to want to make this change because thrift is 
> quasi/dead but it would allow us to evolve thrift in a meaningful way. We 
> could simple add these new methods under different names as well.



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