sankalp kohli created CASSANDRA-12668:

             Summary: Memtable Contention in 2.1
                 Key: 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 

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