• File size measurements show the distribution of size of files.
• Files are classified in four categories based on their size (lines of code): 1-100 (very small files), 101-200 (small files), 201-500 (medium size files), 501-1000 (long files), 1001+(very long files).
• It is a good practice to keep files small. Long files may become "bloaters", code that have increased to such gargantuan proportions that they are hard to work with.

• There are 1,474 files with 143,848 lines of code.
• 8 very long files (10,258 lines of code)
• 36 long files (25,241 lines of code)
• 143 medium size files (45,670 lines of codeclsfd_ftr_w_mp_ins)
• 180 small files (25,544 lines of code)
• 1,107 very small files (37,135 lines of code)

There are 535 files with lines longer than 120 characters. In total, there are 3596 long lines.

File	# lines	# units	# long lines
KafkaConfig.scala in core/src/main/scala/kafka/server	1063	9	202
ConsumerGroupCommand.scala in core/src/main/scala/kafka/admin	892	42	84
ProducerConfig.java in clients/src/main/java/org/apache/kafka/clients/producer	281	8	81
KafkaApis.scala in core/src/main/scala/kafka/server	1829	72	67
ReassignPartitionsCommand.scala in core/src/main/scala/kafka/admin	529	27	63
ConnectMetricsRegistry.java in connect/runtime/src/main/java/org/apache/kafka/connect/runtime	290	12	58
KafkaController.scala in core/src/main/scala/kafka/controller	1104	76	54
TransactionStateManager.scala in core/src/main/scala/kafka/coordinator/transaction	463	13	51
StreamsConfig.java in streams/src/main/java/org/apache/kafka/streams	584	29	51
ReplicaManager.scala in core/src/main/scala/kafka/server	1101	44	49
PartitionStateMachine.scala in core/src/main/scala/kafka/controller	362	21	45
StreamThread.java in streams/src/main/java/org/apache/kafka/streams/processor/internals	836	44	40
StreamsResetter.java in core/src/main/scala/kafka/tools	500	23	39
ConsumerConfig.java in clients/src/main/java/org/apache/kafka/clients/consumer	343	8	38
ConfigDef.java in clients/src/main/java/org/apache/kafka/common/config	801	72	37
Log.scala in core/src/main/scala/kafka/log	1086	63	32
ConsoleConsumer.scala in core/src/main/scala/kafka/tools	495	21	30
DistributedHerder.java in connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed	987	61	29
TransactionMarkerChannelManager.scala in core/src/main/scala/kafka/coordinator/transaction	300	17	28
KStreamImpl.java in streams/src/main/java/org/apache/kafka/streams/kstream/internals	769	77	27