split large sstable

[Radim Kolar]

Is there some simple way how to split large sstable into several smaller 
ones? I increased  min_compaction_threshold (smaller tables seems to get 
better file offset caching from OS) and now i need to reshuffle data to 
smaller sstables, running several cluster wide repairs worked well just 
largest table was left. I have 80 GB sstable and need to split it to 
about 10 GB ones.