Just upgraded our cluster from 2.1.1 to 2.1.2 and our nodes keep dying. The kernel is killing the process due to out of memory: 

kernel:  Out of memory: Kill process 6267 (java) score 998 or sacrifice child

Appears to only occur during compactions. We've tried playing with the heap settings but nothing has worked thus far. We did not have this issue until we upgraded. Anyone else run into this or have suggestions?