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kafka trouble shooting#23
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MIDDLEWARE-30738

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@yuhaosdl yuhaosdl commented Apr 15, 2026

Summary by CodeRabbit

  • Documentation
    • Added comprehensive troubleshooting guides covering Kafka consumer group rebalancing behavior, impacts, common causes, and configuration tuning.
    • Added documentation on diagnosing and resolving increasing consumer lag with classification frameworks and mitigation strategies.
    • Added incident-focused guide for handling duplicate and missing messages with best practices for idempotent processing.
    • Added troubleshooting guide for producer send timeouts and latency issues with root cause analysis and actionable recommendations.
    • Added guide for diagnosing Kafka Connect connector NotReady status with verification steps and runtime failure scenarios.

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coderabbitai Bot commented Apr 15, 2026

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ℹ️ Review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 137322a6-4de0-4380-b2e6-366f65995bc3

📥 Commits

Reviewing files that changed from the base of the PR and between 354b539 and 12239ab.

📒 Files selected for processing (6)
  • docs/en/trouble_shooting/20-consumer-group-rebalance.mdx
  • docs/en/trouble_shooting/30-consumer-lag-is-increasing.mdx
  • docs/en/trouble_shooting/40-messages-are-repeated-or-missing.mdx
  • docs/en/trouble_shooting/50-producer-send-timeout-or-high-latency.mdx
  • docs/en/trouble_shooting/90-kafka-connect-connector-stays-in-notready.mdx
  • docs/en/trouble_shooting/index.mdx

Walkthrough

Six new troubleshooting documentation pages were added to guide users through common Kafka issues: consumer group rebalancing, consumer lag, duplicate/missing messages, producer latency, and KafkaConnect connector failures. An index page was also created to organize the troubleshooting section.

Changes

Cohort / File(s) Summary
Troubleshooting Guides
docs/en/trouble_shooting/20-consumer-group-rebalance.mdx, docs/en/trouble_shooting/30-consumer-lag-is-increasing.mdx, docs/en/trouble_shooting/40-messages-are-repeated-or-missing.mdx, docs/en/trouble_shooting/50-producer-send-timeout-or-high-latency.mdx, docs/en/trouble_shooting/90-kafka-connect-connector-stays-in-notready.mdx
Five comprehensive troubleshooting guides covering rebalancing triggers and impacts, consumer lag diagnosis and mitigation, duplicate/missing message scenarios, producer send timeouts and latency, and KafkaConnect connector lifecycle issues. Each includes root cause analysis, configuration tuning recommendations, monitoring guidance, and best practices checklists.
Troubleshooting Index
docs/en/trouble_shooting/index.mdx
New section index with internationalization support and component rendering for overview content.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Five guides hop into the warren so neat,
Consumer woes and producer defeats!
From lag to rebalance, duplicates too,
KafkaConnect troubles with paths to pursue.
A troubleshooting garden, complete and bright!

🚥 Pre-merge checks | ✅ 3
✅ Passed checks (3 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title 'kafka trouble shooting' directly describes the main change: adding comprehensive Kafka troubleshooting documentation pages covering consumer group rebalance, consumer lag, duplicate/missing messages, producer latency, and KafkaConnect issues.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

✨ Finishing Touches
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch MIDDLEWARE-30738

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Actionable comments posted: 2

🧹 Nitpick comments (2)
docs/en/trouble_shooting/30-consumer-lag-is-increasing.mdx (1)

24-24: Minor wording polish for readability.

A few lines read more naturally with small edits:

  • Line 24: “A few partitions…” (instead of “A small number…”).
  • Line 51: “...and a rebalance can make lag worse.”
  • Line 85: “Frequent rebalances make lag recovery slower.”

Also applies to: 51-51, 85-85

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@docs/en/trouble_shooting/30-consumer-lag-is-increasing.mdx` at line 24,
Replace the specified wording for readability: change the phrase "A small number
of partitions receive most of the traffic" (occurrence around the first noted
instance) to "A few partitions receive most of the traffic"; change the sentence
at the second noted instance to include the article, making it "...and a
rebalance can make lag worse."; and update the third noted instance to pluralize
"rebalance" to "Frequent rebalances make lag recovery slower." Ensure these
exact wording updates are applied at the three indicated occurrences.
docs/en/trouble_shooting/50-producer-send-timeout-or-high-latency.mdx (1)

55-55: Tighten two phrases for more natural style.

Suggested edits:

  • Line 55: “If leaders often move …”
  • Line 63: “Do not use excessively large timeouts …”

Also applies to: 63-63

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@docs/en/trouble_shooting/50-producer-send-timeout-or-high-latency.mdx` at
line 55, Replace the two suggested phrases in the document: change the sentence
fragment "leaders move often" to "often move" (i.e., make the phrase read "If
leaders often move or ISR is unstable...") and change "excessively large
timeouts" to "excessively large timeouts" where applicable (i.e., ensure the
sentence reads "Do not use excessively large timeouts..."); update the text at
the two instances mentioned so the phrasing is tighter and more natural.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@docs/en/trouble_shooting/90-kafka-connect-connector-stays-in-notready.mdx`:
- Line 5: The document title uses "KafkaConnect" but should use the standard
product name "Kafka Connect"; update the header string "# KafkaConnect Connector
Stays in NotReady" to "# Kafka Connect Connector Stays in NotReady" (search for
the title line or the literal "KafkaConnect" in this file and replace it) to
ensure consistent product naming across the docs.

In `@docs/en/trouble_shooting/index.mdx`:
- Line 6: Update the frontmatter title value that currently reads "title:
Trouble Shooting" to the standard spelling "title: Troubleshooting" so the
document heading uses the single-word, conventional form; change the string in
the existing title key to "Troubleshooting".

---

Nitpick comments:
In `@docs/en/trouble_shooting/30-consumer-lag-is-increasing.mdx`:
- Line 24: Replace the specified wording for readability: change the phrase "A
small number of partitions receive most of the traffic" (occurrence around the
first noted instance) to "A few partitions receive most of the traffic"; change
the sentence at the second noted instance to include the article, making it
"...and a rebalance can make lag worse."; and update the third noted instance to
pluralize "rebalance" to "Frequent rebalances make lag recovery slower." Ensure
these exact wording updates are applied at the three indicated occurrences.

In `@docs/en/trouble_shooting/50-producer-send-timeout-or-high-latency.mdx`:
- Line 55: Replace the two suggested phrases in the document: change the
sentence fragment "leaders move often" to "often move" (i.e., make the phrase
read "If leaders often move or ISR is unstable...") and change "excessively
large timeouts" to "excessively large timeouts" where applicable (i.e., ensure
the sentence reads "Do not use excessively large timeouts..."); update the text
at the two instances mentioned so the phrasing is tighter and more natural.
🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

ℹ️ Review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 32bea1af-1a9b-4793-a49b-9effc283ad4a

📥 Commits

Reviewing files that changed from the base of the PR and between 339f045 and 354b539.

📒 Files selected for processing (6)
  • docs/en/trouble_shooting/20-consumer-group-rebalance.mdx
  • docs/en/trouble_shooting/30-consumer-lag-is-increasing.mdx
  • docs/en/trouble_shooting/40-messages-are-repeated-or-missing.mdx
  • docs/en/trouble_shooting/50-producer-send-timeout-or-high-latency.mdx
  • docs/en/trouble_shooting/90-kafka-connect-connector-stays-in-notready.mdx
  • docs/en/trouble_shooting/index.mdx

weight: 90
---

# KafkaConnect Connector Stays in NotReady
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⚠️ Potential issue | 🟡 Minor

Use consistent product naming: “Kafka Connect”.

Line 5 uses “KafkaConnect”; use “Kafka Connect” to match standard naming and improve docs consistency.

Suggested edit
-# KafkaConnect Connector Stays in NotReady
+# Kafka Connect Connector Stays in NotReady
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
# KafkaConnect Connector Stays in NotReady
# Kafka Connect Connector Stays in NotReady
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@docs/en/trouble_shooting/90-kafka-connect-connector-stays-in-notready.mdx` at
line 5, The document title uses "KafkaConnect" but should use the standard
product name "Kafka Connect"; update the header string "# KafkaConnect Connector
Stays in NotReady" to "# Kafka Connect Connector Stays in NotReady" (search for
the title line or the literal "KafkaConnect" in this file and replace it) to
ensure consistent product naming across the docs.

i18n:
title:
zh: 常见问题
title: Trouble Shooting
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⚠️ Potential issue | 🟡 Minor

Use standard heading spelling: “Troubleshooting”.

Line 6 currently uses “Trouble Shooting”, which is nonstandard and inconsistent with common docs terminology.

Suggested edit
-title: Trouble Shooting
+title: Troubleshooting
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
title: Trouble Shooting
title: Troubleshooting
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@docs/en/trouble_shooting/index.mdx` at line 6, Update the frontmatter title
value that currently reads "title: Trouble Shooting" to the standard spelling
"title: Troubleshooting" so the document heading uses the single-word,
conventional form; change the string in the existing title key to
"Troubleshooting".

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cloudflare-workers-and-pages Bot commented Apr 15, 2026

Deploying alauda-kafka with  Cloudflare Pages  Cloudflare Pages

Latest commit: 12239ab
Status: ✅  Deploy successful!
Preview URL: https://6e30dae9.alauda-kafka.pages.dev
Branch Preview URL: https://middleware-30738.alauda-kafka.pages.dev

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@JounQin JounQin force-pushed the MIDDLEWARE-30738 branch from 354b539 to 12239ab Compare May 16, 2026 13:59
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