# Stuck on stage #FD8, tester failing to test valid reponse **URL:** \ **Category:** Bug Reports\ **Tags:** challenge:kafka\ **Created:** [April 2, 2025, 11:04am UTC](https://forum.codecrafters.io/t/stuck-on-stage-fd8-tester-failing-to-test-valid-reponse/8085 "2025-04-02T11:04:11Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![abastian](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/abastian/32/6471_2.png) [@abastian](https://forum.codecrafters.io/u/abastian)\ **Post date:** [April 2, 2025, 11:04am UTC](https://forum.codecrafters.io/t/stuck-on-stage-fd8-tester-failing-to-test-valid-reponse/8085/1 "2025-04-02T11:04:11Z")
I’m stuck on Stage #FD8. I’ve tried debugging to capture my response locally (using `codecrafters test`) and passing it to my lib, try to debug it hoping to find error, but it pass, I mean the response can be parse… Here are my logs: ```auto vscode ➜ /workspaces/codecrafters-kafka-rust (master) $ codecrafters test Initiating test run... ⏳ Turbo test runners busy. You are in queue. Upgrade to skip the wait: https://codecrafters.io/turbo Running tests. Logs should appear shortly... [compile] Compiling codecrafters-kafka v0.1.0 (/app) [compile] Finished `release` profile [optimized] target(s) in 3.42s [compile] Moved ./.codecrafters/run.sh → ./your_program.sh [compile] Compilation successful. Debug = true [tester::#FD8] Running tests for Stage #FD8 (Consuming Messages - Fetch multiple messages from disk) [tester::#FD8] [Serializer] Writing log files to: /tmp/kraft-combined-logs [tester::#FD8] [Serializer] - Wrote file to: /tmp/server.properties [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/meta.properties [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/.kafka_cleanshutdown [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/baz-0/partition.metadata [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/pax-0/partition.metadata [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/paz-0/partition.metadata [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/paz-1/partition.metadata [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/__cluster_metadata-0/partition.metadata [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/baz-0/00000000000000000000.log [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/pax-0/00000000000000000000.log [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/paz-0/00000000000000000000.log [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/paz-1/00000000000000000000.log [tester::#FD8] [Serializer] - Wrote file to: /tmp/kraft-combined-logs/__cluster_metadata-0/00000000000000000000.log [tester::#FD8] [Serializer] Finished writing log files to: /tmp/kraft-combined-logs [tester::#FD8] $ ./your_program.sh /tmp/server.properties [tester::#FD8] Connecting to broker at: localhost:9092 [your_program] Logs from your program will appear here! [tester::#FD8] Connection to broker at localhost:9092 successful [tester::#FD8] Sending "Fetch" (version: 16) request (Correlation id: 1983587668) [tester::#FD8] Hexdump of sent "Fetch" request: [tester::#FD8] Idx | Hex | ASCII [tester::#FD8] -----+-------------------------------------------------+----------------- [tester::#FD8] 0000 | 00 00 00 60 00 01 00 10 76 3b 25 54 00 09 6b 61 | ...`....v;%T..ka [tester::#FD8] 0010 | 66 6b 61 2d 63 6c 69 00 00 00 01 f4 00 00 00 01 | fka-cli......... [tester::#FD8] 0020 | 03 20 00 00 00 00 00 00 00 00 00 00 00 02 00 00 | . .............. [tester::#FD8] 0030 | 00 00 00 00 40 00 80 00 00 00 00 00 00 30 02 00 | ....@........0.. [tester::#FD8] 0040 | 00 00 00 ff ff ff ff 00 00 00 00 00 00 00 00 ff | ................ [tester::#FD8] 0050 | ff ff ff ff ff ff ff ff ff ff ff 00 10 00 00 00 | ................ [tester::#FD8] 0060 | 00 01 01 00 | .... [tester::#FD8] [your_program] accepted new connection [your_program] read 167 bytes from paz-0/00000000000000000000.log [your_program] read 0 bytes from paz-1/00000000000000000000.log [tester::#FD8] Hexdump of received "Fetch" response: [tester::#FD8] Idx | Hex | ASCII [tester::#FD8] -----+-------------------------------------------------+----------------- [tester::#FD8] 0000 | 00 00 01 15 76 3b 25 54 00 00 00 00 00 00 00 00 | ....v;%T........ [tester::#FD8] 0010 | 00 00 00 02 00 00 00 00 00 00 40 00 80 00 00 00 | ..........@..... [tester::#FD8] 0020 | 00 00 00 30 03 00 00 00 00 00 00 00 00 00 00 00 | ...0............ [tester::#FD8] 0030 | 00 00 00 ff ff ff ff ff ff ff ff ff ff ff ff ff | ................ [tester::#FD8] 0040 | ff ff ff 00 ff ff ff ff a8 01 00 00 00 00 00 00 | ................ [tester::#FD8] 0050 | 00 00 00 00 00 44 00 00 00 00 02 ab fd 04 91 00 | .....D.......... [tester::#FD8] 0060 | 00 00 00 00 00 00 00 01 91 e0 5b 6d 8b 00 00 01 | ..........[m.... [tester::#FD8] 0070 | 91 e0 5b 6d 8b 00 00 00 00 00 00 00 00 00 00 00 | ..[m............ [tester::#FD8] 0080 | 00 00 00 00 00 00 01 24 00 00 00 01 18 48 65 6c | .......$.....Hel [tester::#FD8] 0090 | 6c 6f 20 4b 61 66 6b 61 21 00 00 00 00 00 00 00 | lo Kafka!....... [tester::#FD8] 00a0 | 00 01 00 00 00 4b 00 00 00 00 02 55 60 53 93 00 | .....K.....U`S.. [tester::#FD8] 00b0 | 00 00 00 00 00 00 00 01 91 e0 5b 6d 8b 00 00 01 | ..........[m.... [tester::#FD8] 00c0 | 91 e0 5b 6d 8b 00 00 00 00 00 00 00 00 00 00 00 | ..[m............ [tester::#FD8] 00d0 | 00 00 00 00 00 00 01 32 00 00 00 01 26 48 65 6c | .......2....&Hel [tester::#FD8] 00e0 | 6c 6f 20 43 6f 64 65 43 72 61 66 74 65 72 73 21 | lo CodeCrafters! [tester::#FD8] 00f0 | 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 | ................ [tester::#FD8] 0100 | ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff | ................ [tester::#FD8] 0110 | 00 ff ff ff ff 00 00 00 00 | ......... [tester::#FD8] [tester::#FD8] [Decoder] - .ResponseHeader [tester::#FD8] [Decoder] - .correlation_id (1983587668) [tester::#FD8] [Decoder] - .TAG_BUFFER [tester::#FD8] [Decoder] - .ResponseBody [tester::#FD8] [Decoder] - .throttle_time_ms (0) [tester::#FD8] [Decoder] - .error_code (0) [tester::#FD8] [Decoder] - .session_id (0) [tester::#FD8] [Decoder] - .num_responses (1) [tester::#FD8] [Decoder] - .TopicResponse[0] [tester::#FD8] [Decoder] - .topic_id (00000000-0000-4000-8000-000000000030) [tester::#FD8] [Decoder] - .num_partitions (2) [tester::#FD8] [Decoder] - .PartitionResponse[0] [tester::#FD8] [Decoder] - .partition_index (0) [tester::#FD8] [Decoder] - .error_code (0) [tester::#FD8] [Decoder] - .high_watermark (0) [tester::#FD8] [Decoder] - .last_stable_offset (-1) [tester::#FD8] [Decoder] - .log_start_offset (-1) [tester::#FD8] [Decoder] - .num_aborted_transactions (0) [tester::#FD8] [Decoder] - .preferred_read_replica (-1) [tester::#FD8] [Decoder] - .compact_records_length (167) [tester::#FD8] [Decoder] - .RecordBatch[0] [tester::#FD8] [Decoder] - .base_offset (0) [tester::#FD8] [Decoder] - .batch_length (68) [tester::#FD8] [Decoder] - .partition_leader_epoch (0) [tester::#FD8] [Decoder] - .magic_byte (2) [tester::#FD8] [Decoder] - .crc (-1409481583) [tester::#FD8] [Decoder] - .record_attributes (0) [tester::#FD8] [Decoder] - .last_offset_delta (0) [tester::#FD8] [Decoder] - .base_timestamp (1726045973899) [tester::#FD8] [Decoder] - .max_timestamp (1726045973899) [tester::#FD8] [Decoder] - .producer_id (0) [tester::#FD8] [Decoder] - .producer_epoch (0) [tester::#FD8] [Decoder] - .base_sequence (0) [tester::#FD8] [Decoder] - .num_records (1) [tester::#FD8] [Decoder] - .Record[0] [tester::#FD8] [Decoder] - .length (18) [tester::#FD8] [Decoder] - .attributes (0) [tester::#FD8] [Decoder] - .timestamp_delta (0) [tester::#FD8] [Decoder] - .offset_delta (0) [tester::#FD8] [Decoder] - .key_length (-1) [tester::#FD8] [Decoder] - .key ("") [tester::#FD8] [Decoder] - .value_length (12) [tester::#FD8] [Decoder] - .value ("Hello Kafka!") [tester::#FD8] [Decoder] - .num_headers (0) [tester::#FD8] [Decoder] - .RecordBatch[1] [tester::#FD8] [Decoder] - .base_offset (1) [tester::#FD8] [Decoder] - .batch_length (75) [tester::#FD8] [Decoder] - .partition_leader_epoch (0) [tester::#FD8] [Decoder] - .magic_byte (2) [tester::#FD8] [Decoder] - .crc (1432376211) [tester::#FD8] [Decoder] - .record_attributes (0) [tester::#FD8] [Decoder] - .last_offset_delta (0) [tester::#FD8] [Decoder] - .base_timestamp (1726045973899) [tester::#FD8] [Decoder] - .max_timestamp (1726045973899) [tester::#FD8] [Decoder] - .producer_id (0) [tester::#FD8] [Decoder] - .producer_epoch (0) [tester::#FD8] [Decoder] - .base_sequence (0) [tester::#FD8] [Decoder] - .num_records (1) [tester::#FD8] [Decoder] - .Record[0] [tester::#FD8] [Decoder] - .length (25) [tester::#FD8] [Decoder] - .attributes (0) [tester::#FD8] [Decoder] - .timestamp_delta (0) [tester::#FD8] [Decoder] - .offset_delta (0) [tester::#FD8] [Decoder] - .key_length (-1) [tester::#FD8] [Decoder] - .key ("") [tester::#FD8] [Decoder] - .value_length (19) [tester::#FD8] [Decoder] - .value ("Hello CodeCrafters!") [tester::#FD8] [Decoder] - .num_headers (0) [tester::#FD8] [Decoder] - .RecordBatch[2] [tester::#FD8] [Decoder] - .base_offset (16777216) [tester::#FD8] [Decoder] - .batch_length (0) [tester::#FD8] [Decoder] - .partition_leader_epoch (255) [tester::#FD8] [Decoder] - .magic_byte (-1) [tester::#FD8] [Decoder] - .crc (-1) [tester::#FD8] Received: [tester::#FD8] Hex (bytes 253-268) | ASCII [tester::#FD8] ------------------------------------------------+------------------ [tester::#FD8] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00 | ................ [tester::#FD8] ^ ^ [tester::#FD8] Error: CRC mismatch: calculated 00000000, expected ffffffff [tester::#FD8] Context: [tester::#FD8] - Fetch Response v16 [tester::#FD8] - Response Body [tester::#FD8] - TopicResponse[0] [tester::#FD8] - PartitionResponse[0] [tester::#FD8] - RecordBatch[2] [tester::#FD8] - crc [tester::#FD8] [tester::#FD8] Test failed [tester::#FD8] Terminating program [tester::#FD8] Program terminated successfully ``` What I find interesting here, tester seem adamant that there’s third `RecordBatch` within first `PartitionResponse` when actually it only consist of 2 `RecordBatch` then follow by another `PartitionResponse` with empty `RecordBatch`. I have write an unit test which only parse the same response here. You can find my code at [abastian/codecrafters-kafka-rust](https://github.com/abastian/codecrafters-kafka-rust) ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [April 2, 2025, 4:41pm UTC](https://forum.codecrafters.io/t/stuck-on-stage-fd8-tester-failing-to-test-valid-reponse/8085/4 "2025-04-02T16:41:22Z")
Hey @abastian, we’re checking if this needs to be addressed on our tester. I’ll follow up as soon as I have an update! ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [April 3, 2025, 8:48pm UTC](https://forum.codecrafters.io/t/stuck-on-stage-fd8-tester-failing-to-test-valid-reponse/8085/5 "2025-04-03T20:48:37Z")
@abastian We’ve fixed the issue where the tester continued parsing when it shouldn’t have in [this PR](https://github.com/codecrafters-io/kafka-tester/pull/43). Let us know if it works as expected now! ---
**Author:** ![abastian](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/abastian/32/6471_2.png) [@abastian](https://forum.codecrafters.io/u/abastian)\ **Post date:** [April 4, 2025, 8:05am UTC](https://forum.codecrafters.io/t/stuck-on-stage-fd8-tester-failing-to-test-valid-reponse/8085/7 "2025-04-04T08:05:07Z")
Confirm, parsing have been passed now, thank you… 👍😀 ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/7/0/700657133935c15703e22c7c8870394f6e6dc27d.svg) [@system](https://forum.codecrafters.io/u/system)\ **Post date:** [April 11, 2025, 8:05am UTC](https://forum.codecrafters.io/t/stuck-on-stage-fd8-tester-failing-to-test-valid-reponse/8085/8 "2025-04-11T08:05:25Z")
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