tunnel/tcp_writer.go (2 lines):
	- line 92: // TODO: now crc32 is marked zero
	- line 208: // TODO: no timeout ??


executor/collision_matrix.go (2 lines):
	- line 282: // TODO: execute path may be walked from DEFAULT we meet something that the type
	- line 289: // TODO: BSON's object or array is already sorted ?! we can get the intersection more easier


collector/batcher.go (2 lines):
	- line 343: // TODO need do filter
	- line 361: // TODO need do filter


collector/filter/oplog_filter.go (1 line):
	- line 221: // TODO move all extra and filter to individual func


collector/persister.go (1 line):
	- line 159: // TODO unlock?


collector/worker.go (1 line):
	- line 179: // TODO: send all unack logs ? it's possible very big


executor/executor.go (1 line):
	- line 94: // TODO: skip the oplogRecords which has been replayed