# Topic name question about vt6: List for an unknown topic **URL:** \ **Category:** Challenges\ **Tags:** challenge:kafka\ **Created:** [February 27, 2025, 12:57pm UTC](https://forum.codecrafters.io/t/topic-name-question-about-vt6-list-for-an-unknown-topic/5614 "2025-02-27T12:57:40Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![tmfc](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/tmfc/32/5789_2.png) [@tmfc](https://forum.codecrafters.io/u/tmfc)\ **Post date:** [February 27, 2025, 12:57pm UTC](https://forum.codecrafters.io/t/topic-name-question-about-vt6-list-for-an-unknown-topic/5614/1 "2025-02-27T12:57:40Z")
I got a test fail when testing this:Expected TopicResponse[0] Topic Name to be unknown-topic-quz, got unknown-topic-quz It looks the name is just the same as the test case expected, andI checked everything include source code, kafka response format, hexdump of request and response, everything looks fine. Here is the log: ```auto remote: [tester::#VT6] Running tests for Stage #VT6 (Listing Partitions - List for an unknown topic) remote: [tester::#VT6] $ ./your_program.sh /tmp/server.properties remote: [tester::#VT6] Connecting to broker at: localhost:9092 remote: [your_program] 启动 Kafka 服务器... remote: [tester::#VT6] Connection to broker at localhost:9092 successful remote: [tester::#VT6] Sending "DescribeTopicPartitions" (version: 0) request (Correlation id: 1472045599) remote: [tester::#VT6] Hexdump of sent "DescribeTopicPartitions" request: remote: [tester::#VT6] Idx | Hex | ASCII remote: [tester::#VT6] -----+-------------------------------------------------+----------------- remote: [tester::#VT6] 0000 | 00 00 00 31 00 4b 00 00 57 bd a2 1f 00 0c 6b 61 | ...1.K..W.....ka remote: [tester::#VT6] 0010 | 66 6b 61 2d 74 65 73 74 65 72 00 02 12 75 6e 6b | fka-tester...unk remote: [tester::#VT6] 0020 | 6e 6f 77 6e 2d 74 6f 70 69 63 2d 71 75 7a 00 00 | nown-topic-quz.. remote: [tester::#VT6] 0030 | 00 00 01 ff 00 | ..... remote: [tester::#VT6] remote: [your_program] 接受来自 ('::1', 53734, 0, 0) 的连接 remote: [your_program] 请求大小: 49 bytes remote: [your_program] 收到数据: b'\x00K\x00\x00W\xbd\xa2\x1f\x00\x0ckafka-tester\x00\x02\x12unknown-topic-quz\x00\x00\x00\x00\x01\xff\x00' remote: [your_program] 处理请求 remote: [your_program] 发送响应 remote: [tester::#VT6] Hexdump of received "DescribeTopicPartitions" response: remote: [tester::#VT6] Idx | Hex | ASCII remote: [tester::#VT6] -----+-------------------------------------------------+----------------- remote: [tester::#VT6] 0000 | 00 00 00 38 57 bd a2 1f 00 00 00 00 00 02 00 03 | ...8W........... remote: [tester::#VT6] 0010 | 13 12 75 6e 6b 6e 6f 77 6e 2d 74 6f 70 69 63 2d | ..unknown-topic- remote: [tester::#VT6] 0020 | 71 75 7a 00 00 00 00 00 00 00 00 00 00 00 00 00 | quz............. remote: [tester::#VT6] 0030 | 00 00 00 00 00 00 00 00 00 00 ff 00 | ............ remote: [tester::#VT6] remote: [tester::#VT6] [Decoder] - .ResponseHeader remote: [tester::#VT6] [Decoder] - .correlation_id (1472045599) remote: [tester::#VT6] [Decoder] - .TAG_BUFFER remote: [tester::#VT6] [Decoder] - .ResponseBody remote: [tester::#VT6] [Decoder] - .throttle_time_ms (0) remote: [tester::#VT6] [Decoder] - .topic.length (1) remote: [tester::#VT6] [Decoder] - .Topics[0] remote: [tester::#VT6] [Decoder] - .error_code (3) remote: [tester::#VT6] [Decoder] - .name (unknown-topic-quz) remote: [tester::#VT6] [Decoder] - .topic_id (00000000-0000-0000-0000-000000000000) remote: [tester::#VT6] [Decoder] - .is_internal (false) remote: [tester::#VT6] [Decoder] - .num_partitions (0) remote: [tester::#VT6] [Decoder] - .topic_authorized_operations (0) remote: [tester::#VT6] [Decoder] - .TAG_BUFFER remote: [tester::#VT6] [Decoder] - .next_cursor (null) remote: [tester::#VT6] [Decoder] - .TAG_BUFFER remote: [tester::#VT6] ✓ Correlation ID: 1472045599 remote: [tester::#VT6] ✓ Throttle Time: 0 remote: [tester::#VT6] ✓ TopicResponse[0] Error code: 3 remote: [tester::#VT6] Expected TopicResponse[0] Topic Name to be unknown-topic-quz, got unknown-topic-quz remote: [tester::#VT6] Test failed remote: [tester::#VT6] Terminating program remote: [tester::#VT6] Program terminated successfully ``` ---
**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:** [February 27, 2025, 1:26pm UTC](https://forum.codecrafters.io/t/topic-name-question-about-vt6-list-for-an-unknown-topic/5614/3 "2025-02-27T13:26:57Z")
Hi @tmfc, could you [upload your code to GitHub](https://docs.codecrafters.io/features/publish-to-github) and share the link? It will be much easier to debug if I can run it directly. ---
**Author:** ![tmfc](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/tmfc/32/5789_2.png) [@tmfc](https://forum.codecrafters.io/u/tmfc)\ **Post date:** [February 28, 2025, 2:18pm UTC](https://forum.codecrafters.io/t/topic-name-question-about-vt6-list-for-an-unknown-topic/5614/5 "2025-02-28T14:18:42Z")
Hi Andy, Thank you for replying. I have published my code to GitHub, here it is: [GitHub - tmfc/codecrafters-kafka-python](https://github.com/tmfc/codecrafters-kafka-python) ---
**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 4, 2025, 3:01pm UTC](https://forum.codecrafters.io/t/topic-name-question-about-vt6-list-for-an-unknown-topic/5614/6 "2025-04-04T15:01:07Z")
@tmfc Sorry for the delayed response! Looks like the CompactString of **topic\_names** was encoded as CompactString again: ![image](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/2X/2/2d8dcf4233da0366569a8904c79f214fb65c5d33.png) ![image](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/2X/f/fa737ce433dd761b804ad2cff34c3b201d030dce.png) ---
**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 13, 2025, 11:04pm UTC](https://forum.codecrafters.io/t/topic-name-question-about-vt6-list-for-an-unknown-topic/5614/8 "2025-04-13T23:04:58Z")
Closing this thread due to inactivity. If you still need assistance, feel free to reopen or start a new discussion! ---
**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 18, 2025, 11:05pm UTC](https://forum.codecrafters.io/t/topic-name-question-about-vt6-list-for-an-unknown-topic/5614/9 "2025-04-18T23:05:02Z")
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