Major - P3 In tests I see non-primary replicas printing lines like this during replication, in the applier threads, during initial sync:
[js_test:movechunk_with_default_paranoia] 2016-07-22T20:41:36.934+0000 c22264| 2016-07-22T20:41:36.934+0000 I SHARDING [initial sync] Marking collection as not sharded. ... [js_test:movechunk_with_default_paranoia] 2016-07-22T20:41:45.946+0000 c22262| 2016-07-22T20:41:45.946+0000 I SHARDING [rsSync] Marking collection as not sharded. ... [js_test:movechunk_with_default_paranoia] 2016-07-22T20:41:47.017+0000 c22264| 2016-07-22T20:41:47.017+0000 I REPL [ReplicationExecutor] Member ip-10-45-2-165:22262 is now in state PRIMARY [js_test:movechunk_with_default_paranoia] 2016-07-22T20:41:47.018+0000 c22264| 2016-07-22T20:41:47.017+0000 I REPL [rsBackgroundSync] syncing from: ip-10-45-2-165:22262 [js_test:movechunk_with_default_paranoia] 2016-07-22T20:41:47.018+0000 c22264| 2016-07-22T20:41:47.018+0000 I SHARDING [repl writer worker 15] Marking collection as not sharded.