***** A ProduceRequest Hex Stream: 00000049000000000000000400000000000005dc0000000100076d79746f7069630000000100000000000000200000000000000000000000148dc795a20000ffffffff0000000648656c6c6f21

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:49: # MessageSize => int32 (a size 0x49 = 73 bytes) *** Request header RequestMessage => ApiKey ApiVersion CorrelationId ClientId RequestMessage 00:00: # ApiKey => int16 00:00: # ApiVersion => int16 00:00:00:04: # CorrelationId => int32 00:00: # ClientId => string (a length 0 bytes) **** ProduceRequest ProduceRequest => RequiredAcks Timeout [TopicName [Partition MessageSetSize MessageSet]] 00:01: # RequiredAcks => int16 (1, the server will wait the data is written to the local log before sending a response) 00:00:05:dc: # Timeout => int32 (0x5dc = 1_500 ms) *** Array data for 'topics': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'partitions': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'partitions' array 00:00:00:00: # Partition => int32 00:00:00:20: # MessageSetSize => int32 (a size 0x20 = 32 bytes) MessageSet MessageSet => [Offset MessageSize Message] 00:00:00:00:00:00:00:00: # Offset => int64 (any value here) 00:00:00:14: # MessageSize => int32 (a size 0x14 = 20 bytes) Message Message => Crc MagicByte Attributes Key Value 8d:c7:95:a2: # Crc => int32 00: # MagicByte => int8 00: # Attributes => int8 (the lowest 2 bits - Compression None) ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) 00:00:00:06: # Value => bytes (a length 0x6 = 6 bytes) 48:65:6c:6c:6f:21 # content = 'Hello!' ] the end of the first element of the 'partitions' array ] the end of the first element of 'topics' the array

***** A Response Hex Stream: 00000023000000040000000100076d79746f706963000000010000000000000000000000000000

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:23: # Size => int32 (a size 0x23 = 35 bytes) Response => CorrelationId ResponseMessage 00:00:00:04: # CorrelationId => int32 ProduceResponse => [TopicName [Partition ErrorCode Offset]] *** Array data for topics: 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'partitions': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'partitions' array 00:00:00:00: # Partition => int32 00:00: # ErrorCode => int16 00:00:00:00:00:00:00:00 # Offset => int64 ] the end of the first element of the 'partitions' array ] the end of the first element of 'topics' the array

***** A ProduceRequest (GZIP) Hex Stream: 0000007a000000000000000400000001000005dc0000000100076d79746f706963000000010000000000000051000000000000000000000045a5c2da7f0001ffffffff000000371f8b0800d7054f5300036360800331b99d0d171918fe030190c7e1919a9393af60a8c880a4c274ca65217415468a002d91792a44000000

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:7a: # MessageSize => int32 (a size 0x7a = 122 bytes) *** Request header RequestMessage => ApiKey ApiVersion CorrelationId ClientId RequestMessage 00:00: # ApiKey => int16 00:00: # ApiVersion => int16 00:00:00:04: # CorrelationId => int32 00:00: # ClientId => string (a length 0 bytes) **** ProduceRequest ProduceRequest => RequiredAcks Timeout [TopicName [Partition MessageSetSize MessageSet]] 00:01: # RequiredAcks => int16 (1, the server will wait the data is written to the local log before sending a response) 00:00:05:dc: # Timeout => int32 (0x5dc = 1_500 ms) *** Array data for 'topics': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'partitions': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'partitions' array 00:00:00:00: # Partition => int32 00:00:00:51: # MessageSetSize => int32 (a size 0x51 = 81 bytes) MessageSet MessageSet => [Offset MessageSize Message] 00:00:00:00:00:00:00:00: # Offset => int64 (any value here) 00:00:00:45: # MessageSize => int32 (a size 0x45 = 69 bytes) Message Message => Crc MagicByte Attributes Key Value a5:c2:da:7f: # Crc => int32 00: # MagicByte => int8 01: # Attributes => int8 (the lowest 2 bits - Compression GZIP) ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) 00:00:00:37: # Value => bytes (a length 0x37 = 55 bytes) # content = compressed MessageSet 1f:8b:08:00:d7:05:4f:53:00:03:63:60:80:03:31:b9:9d:0d:17:19:18:fe:03:01:90:c7:e1:91:9a:93:93:af:60:a8:c8:80:a4:c2:74:ca:65:21:74:15:46:8a:00:2d:91:79:2a:44:00:00:00 # MessageSet => [Offset MessageSize Message] # # 00:00:00:00:00:00:00:00: # Offset => int64 (any value here) # 00:00:00:16: # MessageSize => int32 (a size 0x16 = 22 bytes) # Message # Message => Crc MagicByte Attributes Key Value # 1e:b9:80:d1: # Crc => int32 # 00: # MagicByte => int8 # 00: # Attributes => int8 (the lowest 2 bits - Compression NONE) # ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) # 00:00:00:08: # Value => bytes (a length 0x8 = 8 bytes) # 48:65:6C:6C:6F:20:31:21: # content = 'Hello 1!' # # 00:00:00:00:00:00:00:00: # Offset => int64 (any value here) # 00:00:00:16: # MessageSize => int32 (a size 0x16 = 22 bytes) # Message # Message => Crc MagicByte Attributes Key Value # 35:94:d3:12: # Crc => int32 # 00: # MagicByte => int8 # 00: # Attributes => int8 (the lowest 2 bits - Compression NONE) # ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) # 00:00:00:08: # Value => bytes (a length 0x8 = 8 bytes) # 48:65:6C:6C:6F:20:32:21 # content = 'Hello 2!' # ] the end of the first element of the 'partitions' array ] the end of the first element of 'topics' the array

***** A ProduceRequest (SNAPPY) Hex Stream: 0000006f000000000000000400000001000005dc0000000100076d79746f70696300000001000000000000004600000000000000000000003a2ce564450002ffffffff0000002c440000190158161eb980d10000ffffffff0000000848656c6c6f20312119211400163594d3123e2200043221

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:6f: # MessageSize => int32 (a size 0x6f = 111 bytes) *** Request header RequestMessage => ApiKey ApiVersion CorrelationId ClientId RequestMessage 00:00: # ApiKey => int16 00:00: # ApiVersion => int16 00:00:00:04: # CorrelationId => int32 00:00: # ClientId => string (a length 0 bytes) **** ProduceRequest ProduceRequest => RequiredAcks Timeout [TopicName [Partition MessageSetSize MessageSet]] 00:01: # RequiredAcks => int16 (1, the server will wait the data is written to the local log before sending a response) 00:00:05:dc: # Timeout => int32 (0x5dc = 1_500 ms) *** Array data for 'topics': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'partitions': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'partitions' array 00:00:00:00: # Partition => int32 00:00:00:46: # MessageSetSize => int32 (a size 0x46 = 70 bytes) MessageSet MessageSet => [Offset MessageSize Message] 00:00:00:00:00:00:00:00: # Offset => int64 (any value here) 00:00:00:3a: # MessageSize => int32 (a size 0x3a = 58 bytes) Message Message => Crc MagicByte Attributes Key Value 2c:e5:64:45: # Crc => int32 00: # MagicByte => int8 02: # Attributes => int8 (the lowest 2 bits - Compression SNAPPY) ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) 00:00:00:2c: # Value => bytes (a length 0x2c = 44 bytes) # content = compressed MessageSet 44:00:00:19:01:58:16:1e:b9:80:d1:00:00:ff:ff:ff:ff:00:00:00:08:48:65:6c:6c:6f:20:31:21:19:21:14:00:16:35:94:d3:12:3e:22:00:04:32:21 # MessageSet => [Offset MessageSize Message] # # 00:00:00:00:00:00:00:00: # Offset => int64 (any value here) # 00:00:00:16: # MessageSize => int32 (a size 0x16 = 22 bytes) # Message # Message => Crc MagicByte Attributes Key Value # 1e:b9:80:d1: # Crc => int32 # 00: # MagicByte => int8 # 00: # Attributes => int8 (the lowest 2 bits - Compression NONE) # ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) # 00:00:00:08: # Value => bytes (a length 0x8 = 8 bytes) # 48:65:6C:6C:6F:20:31:21: # content = 'Hello 1!' # # 00:00:00:00:00:00:00:00: # Offset => int64 (any value here) # 00:00:00:16: # MessageSize => int32 (a size 0x16 = 22 bytes) # Message # Message => Crc MagicByte Attributes Key Value # 35:94:d3:12: # Crc => int32 # 00: # MagicByte => int8 # 00: # Attributes => int8 (the lowest 2 bits - Compression NONE) # ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) # 00:00:00:08: # Value => bytes (a length 0x8 = 8 bytes) # 48:65:6C:6C:6F:20:32:21 # content = 'Hello 2!' # ] the end of the first element of the 'partitions' array ] the end of the first element of 'topics' the array

***** A FetchRequest Hex Stream: 0000004d00010000000000000016636f6e736f6c652d636f6e73756d65722d3235353535ffffffff00000064000000010000000100076d79746f7069630000000100000000000000000000000000100000

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:4d: # MessageSize => int32 (a size 0x4d = 77 bytes) *** Request header RequestMessage => ApiKey ApiVersion CorrelationId ClientId RequestMessage 00:01: # ApiKey => int16 00:00: # ApiVersion => int16 00:00:00:00: # CorrelationId => int32 00:16: # ClientId => string (a length 0x16 = 22 bytes) 63:6f:6e:73:6f:6c:65:2d:63:6f: # content = 'console-consumer-25555' 6e:73:75:6d:65:72:2d:32:35:35: 35:35: **** FetchRequest FetchRequest => ReplicaId MaxWaitTime MinBytes [TopicName [Partition FetchOffset MaxBytes]] ff:ff:ff:ff: # ReplicaId => int32 (-1) 00:00:00:64: # MaxWaitTime => int32 (x64 = 100 ms) 00:00:00:01: # MinBytes => int32 *** Array data for 'topics': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'partitions': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'partitions' array 00:00:00:00: # Partition => int32 00:00:00:00:00:00:00:00: # FetchOffset => int64 00:10:00:00 # MaxBytes => int32 (x100000 = 1_048_576) ] the end of the first element of the 'partitions' array ] the end of the first element of 'topics' the array

***** A Response Hex Stream: 0000006e000000000000000100076d79746f706963000000010000000000000000000000000002000000470000000000000000000000148dc795a20000ffffffff0000000648656c6c6f2100000000000000010000001b989feb390000ffffffff0000000d48656c6c6f2c20576f726c6421

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:6e: # Size => int32 (a size 0x6e = 110 bytes) Response => CorrelationId ResponseMessage 00:00:00:00: # CorrelationId => int32 FetchResponse => [TopicName [Partition ErrorCode HighwaterMarkOffset MessageSetSize MessageSet]] *** Array data for topics: 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'partitions': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'partitions' array 00:00:00:00: # Partition => int32 00:00: # ErrorCode => int16 00:00:00:00:00:00:00:02: # HighwaterMarkOffset => int64 00:00:00:47: # MessageSetSize => int32 (a size 0x47 = 71 bytes) MessageSet MessageSet => [Offset MessageSize Message] [ the first element of the 'MessageSet' array 00:00:00:00:00:00:00:00: # Offset => int64 00:00:00:14: # MessageSize => int32 (a size 0x14 = 20 bytes) Message Message => Crc MagicByte Attributes Key Value 8d:c7:95:a2: # Crc => int32 00: # MagicByte => int8 00: # Attributes => int8 (the lowest 2 bits - Compression None) ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) 00:00:00:06: # Value => bytes (a length 0x6 = 6 bytes) 48:65:6c:6c:6f:21 # content = 'Hello!' ] the end of the first element of the 'MessageSet' array [ the second element of the 'MessageSet' array 00:00:00:00:00:00:00:01: # Offset => int64 00:00:00:1b: # MessageSize => int32 (a size 0x1b = 27 bytes) Message Message => Crc MagicByte Attributes Key Value 98:9f:eb:39: # Crc => int32 00: # MagicByte => int8 00: # Attributes => int8 (the lowest 2 bits - Compression None) ff:ff:ff:ff: # Key => bytes (a length -1 = null bytes) 00:00:00:0d: # Value => bytes (a length 0xd = 13 bytes) 48:65:6c:6c:6f:2c:20:57:6f:72: # content = 'Hello, World!' 6c:64:21 ] the end of the second element of the 'MessageSet' array ] the end of the first element of the 'partitions' array ] the end of the first element of 'topics' the array

***** A OffsetRequest Hex Stream: 0000004500020000000000000016636f6e736f6c652d636f6e73756d65722d3235353535ffffffff0000000100076d79746f7069630000000100000000fffffffffffffffe00000001

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:45: # MessageSize => int32 (a size 0x45 = 69 bytes) *** Request header RequestMessage => ApiKey ApiVersion CorrelationId ClientId RequestMessage 00:02: # ApiKey => int16 00:00: # ApiVersion => int16 00:00:00:00: # CorrelationId => int32 00:16: # ClientId => string (a length 0x16 = 22 bytes) 63:6f:6e:73:6f:6c:65:2d:63:6f: # content = 'console-consumer-25555' 6e:73:75:6d:65:72:2d:32:35:35: 35:35: **** OffsetRequest OffsetRequest => ReplicaId [TopicName [Partition Time MaxNumberOfOffsets]] ff:ff:ff:ff: # ReplicaId => int32 (-1) *** Array data for topics: 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'partitions': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'partitions' array 00:00:00:00: # Partition => int32 ff:ff:ff:ff:ff:ff:ff:fe: # Time => int64 (-2) 00:00:00:01 # MaxNumberOfOffsets => int32 ] the end of the first element of the 'partitions' array ] the end of the first element of 'topics' the array

***** A Response Hex Stream: 00000027000000000000000100076d79746f70696300000001000000000000000000010000000000000000

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:27: # Size => int32 (a size 0x27 = 39 bytes) Response => CorrelationId ResponseMessage There is also a small issue with the CorrelationId in the offset response always being 0. 00:00:00:00: # CorrelationId => int32 OffsetResponse => [TopicName [PartitionOffsets]] *** Array data for 'topics': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'PartitionOffsets': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'PartitionOffsets' array PartitionOffsets => Partition ErrorCode [Offset] 00:00:00:00: # Partition => int32 00:00: # ErrorCode => int16 ** Array data for 'Offset': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'Offset' array 00:00:00:00:00:00:00:00 # Offset => int64 ] the end of the first element of the 'Offset' array ] the end of the first element of the 'PartitionOffsets' array ] the end of the first element of 'topics' the array

***** A MetadataRequest Hex Stream: 0000002d00030000000000000016636f6e736f6c652d636f6e73756d65722d32353535350000000100076d79746f706963

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:2d: # MessageSize => int32 (a size 0x2d = 45 bytes) *** Request header RequestMessage => ApiKey ApiVersion CorrelationId ClientId RequestMessage 00:03: # ApiKey => int16 00:00: # ApiVersion => int16 00:00:00:00: # CorrelationId => int32 00:16: # ClientId => string (a length 0x16 = 22 bytes) 63:6f:6e:73:6f:6c:65:2d:63:6f: # content = 'console-consumer-25555' 6e:73:75:6d:65:72:2d:32:35:35: 35:35: **** MetadataRequest MetadataRequest => [TopicName] *** Array data for 'topics': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'topics' array 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63 # content = 'mytopic' ] the end of the first element of 'topics' the array

***** A Response Hex Stream: 0000009c00000000000000030000000200137365726765792d6d696e7431342d6b64653634000023890000000000137365726765792d6d696e7431342d6b64653634000023870000000100137365726765792d6d696e7431342d6b646536340000238800000001000000076d79746f70696300000001000000000000000000020000000300000002000000000000000100000003000000020000000000000001

**** Common Request and Response RequestOrResponse => Size (RequestMessage | ResponseMessage) 00:00:00:9c: # Size => int32 (a size 0x9c = 156 bytes) Response => CorrelationId ResponseMessage 00:00:00:00: # CorrelationId => int32 MetadataResponse => [Broker][TopicMetadata] *** Array data for 'Broker': 00:00:00:03: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'Broker' array Broker => NodeId Host Port 00:00:00:02: # NodeId => int32 00:13: # Host => string (a length 0x13 = 19 bytes) 73:65:72:67:65:79:2d:6d:69:6e: # content = 'sergey-mint14-kde64' 74:31:34:2d:6b:64:65:36:34: 00:00:23:89: # Port => int32 (9097) ] the end of the first element of 'Broker' the array [ the second element of the 'Broker' array Broker => NodeId Host Port 00:00:00:00: # NodeId => int32 00:13: # Host => string (a length 0x13 = 19 bytes) 73:65:72:67:65:79:2d:6d:69:6e: # content = 'sergey-mint14-kde64' 74:31:34:2d:6b:64:65:36:34: 00:00:23:87: # Port => int32 (9095) ] the end of the second element of 'Broker' the array [ the third element of the 'Broker' array Broker => NodeId Host Port 00:00:00:01: # NodeId => int32 00:13: # Host => string (a length 0x13 = 19 bytes) 73:65:72:67:65:79:2d:6d:69:6e: # content = 'sergey-mint14-kde64' 74:31:34:2d:6b:64:65:36:34: 00:00:23:88: # Port => int32 (9096) ] the end of the third element of 'Broker' the array *** Array data for 'TopicMetadata': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'TopicMetadata' array TopicMetadata => ErrorCode TopicName [PartitionMetadata] 00:00: # ErrorCode => int16 00:07: # TopicName => string (a length 0x7 = 7 bytes) 6d:79:74:6f:70:69:63: # content = 'mytopic' ** Array data for 'PartitionMetadata': 00:00:00:01: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'PartitionMetadata' array PartitionMetadata => ErrorCode Partition Leader Replicas Isr 00:00: # ErrorCode => int16 00:00:00:00: # Partition => int32 00:00:00:02: # Leader => int32 Replicas => [ReplicaId] ** Array data for 'Replicas': 00:00:00:03: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'Replicas' array 00:00:00:02: # ReplicaId => int32 ] the end of the first element of the 'Replicas' array [ the second element of the 'Replicas' array 00:00:00:00: # ReplicaId => int32 ] the end of the second element of the 'Replicas' array [ the third element of the 'Replicas' array 00:00:00:01: # ReplicaId => int32 ] the end of the third element of the 'Replicas' array Isr => [ReplicaId] ** Array data for 'Isr': 00:00:00:03: # int32 array size containing the length N (repetitions of the structure) [ the first element of the 'Isr' array 00:00:00:02: # ReplicaId => int32 ] the end of the first element of the 'Isr' array [ the second element of the 'Isr' array 00:00:00:00: # ReplicaId => int32 ] the end of the second element of the 'Isr' array [ the third element of the 'Isr' array 00:00:00:01: # ReplicaId => int32 ] the end of the third element of the 'Isr' array ] the end of the first element of the 'PartitionMetadata' array ] the end of the first element of 'TopicMetadata' the array