One of my colleague had reported the bug regarding the degraded performance of the sstable generator and sstable loader.
ISSUE :- https://issues.apache.org/jira/browse/CASSANDRA-3589
As stated in above issue generator performance is rectified but performance of the sstableloader is still an issue.
3589 is marked as duplicate of 3618.Both issues shows resolved status.But the problem with sstableloader still exists.
So opening other issue so that sstbleloader problem should not go unnoticed.
FYI : We have tested the generator part with the patch given in 3589.Its Working fine.
Please let us know if you guys require further inputs from our side.