INFO may be fine.
However, I am seeing an IOE in balancer that disrupts normal balancer operation. It only occurs after several hours of balancing.
2016-05-14 08:56:27,636 WARN [pool-2302-thread-7] balancer.Dispatcher (Dispatcher.java:dispatch(325)) - Failed to move blk_1550828018_1100035582559 with size=167 from 10.17.1.1:1004:DISK to 10.17.1.2:1004:DISK through 10.17.1.1:1004: Can't re-compute encryption key for nonce, since the required block key (keyID=-327392027) doesn't exist. Current key: -327392024
Balancer aborts after five iterations if no blocks are moved. If you make it DEBUG it's going to be really hard to tell what's going on. From a support perspective it's going to generated many support tickets.