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https://issues.apache.org/jira/browse/CASSANDRA-7688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14294484#comment-14294484
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Aleksey Yeschenko commented on CASSANDRA-7688:
----------------------------------------------

The primary goal is to remove the dependency on Thrift, so that the spark 
connector and our hadoop code don't have to open an extra Thrift connection in 
addition to the native protocol one. See CASSANDRA-8358 for example.

Having that we'd be able to not start Thrift by default, and simpler 
implementations of spark and hadoop things.

> Add data sizing to a system table
> ---------------------------------
>
>                 Key: CASSANDRA-7688
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7688
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jeremiah Jordan
>            Assignee: Aleksey Yeschenko
>             Fix For: 2.1.3
>
>
> Currently you can't implement something similar to describe_splits_ex purely 
> from the a native protocol driver.  
> https://datastax-oss.atlassian.net/browse/JAVA-312 is open to expose easily 
> getting ownership information to a client in the java-driver.  But you still 
> need the data sizing part to get splits of a given size.  We should add the 
> sizing information to a system table so that native clients can get to it.



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