Benedict commented on CASSANDRA-12668:

To respond to your edit:

bq. Is there any warning in NEWS.txt 

You're only just bringing this particular aspect of tradeoff to light now.  
Tradeoffs happen whether we know about them or not, and the fact it's taken so 
long to come to light suggests it was perhaps a perfectly reasonable hidden 

But, anyway, we can't talk about a tradeoff meaningfully until we know both 
sides of the trade.  Let's leave that discussion until we actually know the 

If you're right about the cause, the absolute worst case scenario IMO is to 
provide a patch to make the collection pluggable.

> Memtable Contention in 2.1
> --------------------------
>                 Key: CASSANDRA-12668
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12668
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: sankalp kohli
> We added a new Btree implementation in 2.1 which causes write performance to 
> go down in Cassandra if there is  lot of contention in the memtable for a CQL 
> partition. Upgrading a cluster from 2.0 to 2.1 with contention causes the 
> cluster to fall apart due to GC. We tried making the defaults added in 
> CASSANDRA-7546 configurable but that did not help. Is there anyway to fix 
> this issue?

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