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Caution Review failedThe pull request is closed. ℹ️ Recent review infoConfiguration used: defaults Review profile: CHILL Plan: Pro 📒 Files selected for processing (16)
📝 WalkthroughWalkthroughAdds a Kafka load-testing package with Dockerized infra, CockroachDB initialization, schema definitions, publishers/consumers (single and batch modes), load generators, metrics collection, and CLI runners for CDC and direct testing. Changes
Sequence Diagram(s)sequenceDiagram
participant CLI as CLI/run.ts
participant LG as LoadGenerator
participant MC as MetricsCollector
participant CC as CrdbClient
participant CDC as CdcConsumer
participant Kafka as Kafka
CLI->>LG: runLoadTest(options)
LG->>MC: init
LG->>CC: init
LG->>CDC: init & start
LG->>MC: startPeriodicReporting()
loop generate batches
LG->>CC: insertEvents(...)
LG->>CC: insertOrders(...)
CC->>Kafka: DB changefeed emits messages
Kafka->>CDC: deliver messages
CDC->>MC: recordConsumed(topic, loadtest_ts)
MC->>MC: compute latency
LG->>LG: rate throttling
end
LG->>CDC: drain backlog (with timeout)
CDC->>MC: record remaining
LG->>MC: printFinalReport()
LG->>CDC: close
LG->>CC: close
sequenceDiagram
participant CLI as CLI/run-direct.ts
participant LG as DirectLoadGenerator
participant MC as MetricsCollector
participant DP as DirectPublisher
participant Kafka as Kafka
participant DC as DirectConsumer
CLI->>LG: runDirectLoadTest(options)
LG->>MC: init
LG->>DP: init
LG->>DC: init & start
LG->>MC: startPeriodicReporting()
loop generate batches
LG->>DP: publish direct-events/direct-orders
DP->>Kafka: send messages (with loadtest_ts)
MC->>MC: recordProduced(count)
Kafka->>DC: deliver messages
DC->>MC: recordConsumed(topic, loadtest_ts)
MC->>MC: compute latency
LG->>LG: rate throttling
end
LG->>DC: drain backlog (with timeout)
DC->>MC: record remaining
LG->>MC: printFinalReport()
LG->>DC: close
LG->>DP: close
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes Possibly related PRs
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Actionable comments posted: 5
🧹 Nitpick comments (11)
packages/kafka/load-tests/README.md (2)
85-87: Add language specifier to fenced code blocks.The ASCII diagrams should have a language specifier (e.g.,
textorplaintext) to satisfy markdown linting rules.📝 Suggested fix
-``` +```text Load Generator → CockroachDB (inserts) → CDC Changefeed → Kafka → Consumer → Metrics🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/README.md` around lines 85 - 87, The fenced code block containing the ASCII diagram lacks a language specifier; update the triple-backtick fence around the diagram in the README (the block that currently contains "Load Generator → CockroachDB (inserts) → CDC Changefeed → Kafka → Consumer → Metrics") to include a language tag such as text or plaintext (e.g., ```text) so markdown linting passes and the diagram is treated as plain text.
96-98: Add language specifier to fenced code block.Same issue as the CDC diagram above.
📝 Suggested fix
-``` +```text Load Generator → AbstractKafkaPublisher → Kafka → Consumer → Metrics🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/README.md` around lines 96 - 98, The fenced code block containing the arrow diagram "Load Generator → AbstractKafkaPublisher → Kafka → Consumer → Metrics" is missing a language specifier; update the opening fence from ``` to ```text so it becomes a text code block and preserves formatting/escaping in Markdown and matches the CDC diagram fix pattern.packages/kafka/load-tests/src/cdc-batch-consumer.ts (1)
73-73: Consider disablinglogMessagesfor load tests.
logMessages: truein a high-throughput batch consumer will generate substantial log output during load testing. The non-batchCdcConsumerhas this set tofalse. Unless verbose logging is specifically needed for debugging, consider setting this tofalsefor consistency and reduced noise.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/src/cdc-batch-consumer.ts` at line 73, The load-test batch consumer currently has logMessages: true which will produce excessive output under high throughput; update the consumer config used by the Cdc batch consumer (the object containing logMessages) to set logMessages: false to match the non-batch CdcConsumer and reduce noise during load tests, ensuring any places that instantiate or export that config (e.g., the CdcBatchConsumer configuration object) use the new value.packages/kafka/load-tests/docker-compose.yml (2)
29-30: Consider pinning CockroachDB image version for reproducibility.Using
latest-v25.1is a floating tag that may change over time. For consistent load test results, consider pinning to a specific version (e.g.,cockroachdb/cockroach:v25.1.0).🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/docker-compose.yml` around lines 29 - 30, The docker-compose service "cockroachdb" currently uses the floating tag "cockroachdb/cockroach:latest-v25.1"; change this to a pinned immutable tag (for example "cockroachdb/cockroach:v25.1.0" or another exact patch release) in the "image" field so load tests are reproducible and don't shift when the upstream tag changes.
56-57: Consider pinning kafka-ui image version.
provectuslabs/kafka-ui:latestmay introduce breaking changes. Consider pinning to a specific version for stability.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/docker-compose.yml` around lines 56 - 57, The docker-compose service "kafka-ui" uses the floating image tag provectuslabs/kafka-ui:latest which can introduce breaking changes; update the kafka-ui service definition to pin the image to a specific, tested version (e.g., provectuslabs/kafka-ui:<stable-version>) and document the chosen version; locate the kafka-ui service entry and replace the :latest tag with the selected semantic version or digest and update any related deployment notes or README to record the pinned version for future upgrades.packages/kafka/load-tests/src/batch-load-generator.ts (2)
7-13: Duplicate interface definition withdirect-batch-load-generator.ts.
BatchLoadTestOptionsis identically defined in both this file anddirect-batch-load-generator.ts(lines 9-15). Consider extracting to a shared types file to avoid drift.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/src/batch-load-generator.ts` around lines 7 - 13, The BatchLoadTestOptions interface is duplicated; extract it into a shared types module and import it from both places to avoid drift: create a new exported interface named BatchLoadTestOptions in a common types file, remove the duplicate declarations in batch-load-generator.ts and direct-batch-load-generator.ts, and update both files to import { BatchLoadTestOptions } from the new module so the same definition is referenced everywhere.
49-58: Consider:totalInsertedincludes failed inserts, causing misleading final output.
totalInsertedis incremented before the async insert completes (line 49), butmetrics.recordProducedis only called on success (line 56). If inserts fail, the final log at line 74 will report more rows "inserted" than actually succeeded.For a load test tool this may be acceptable, but for accurate reporting consider incrementing
totalInsertedinside the.then()callback or tracking failures separately.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/src/batch-load-generator.ts` around lines 49 - 58, totalInserted is incremented before the async inserts complete, so failed inserts are counted as successes; move the mutation of totalInserted into the success path and/or maintain a separate failure counter: remove or stop updating totalInserted before Promise.all, then inside the Promise.all .then() callback (after crdb.insertEvents/crdb.insertOrders succeed and metrics.recordProduced is called) increment totalInserted by currentBatch; additionally, in the .catch() increment a new failedInserted (or failedBatches) metric so final reports reflect actual successes vs failures; keep inflight-- in .finally() as-is.packages/kafka/load-tests/src/direct-batch-load-generator.ts (2)
17-34: Duplicate helper functions:generateEventandgenerateOrder.These functions are identical to those in
direct-load-generator.ts(lines 15-32). Consider extracting them to a shared module (e.g.,direct-schemas.tsor a newtest-data-generators.ts) to eliminate duplication.♻️ Suggested approach
Create a shared module:
// test-data-generators.ts export function generateEvent(index: number): DirectEvent { ... } export function generateOrder(index: number): DirectOrder { ... }Then import in both load generators.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/src/direct-batch-load-generator.ts` around lines 17 - 34, The helpers generateEvent and generateOrder are duplicated here and in direct-load-generator.ts; extract both functions into a shared module (e.g., test-data-generators.ts or direct-schemas.ts), export them (generateEvent, generateOrder), then import and use those exports in direct-batch-load-generator.ts (and direct-load-generator.ts) to remove duplication; ensure the exported functions keep the same signatures and return types (DirectEvent, DirectOrder) so callers need no changes.
1-103: Observation: Structural similarity withdirect-load-generator.ts.The overall structure closely mirrors
direct-load-generator.ts. If more load test variants are planned, consider a factory or shared orchestration function parameterized by consumer type to reduce maintenance burden. For now, the duplication is manageable.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/src/direct-batch-load-generator.ts` around lines 1 - 103, The file duplicates orchestration logic already in direct-load-generator.ts; refactor by extracting the shared load-test orchestration into a single function (e.g., runLoadTestCore) that accepts injected components/factories and options, then modify runDirectBatchLoadTest to call that core with DirectBatchConsumer, DirectPublisher, MetricsCollector and the BatchLoadTestOptions; specifically, move common setup (MetricsCollector creation, publisher/consumer init, publish loop, rate throttling, drain/wait logic, reporting and shutdown) into the core, keep only the variant-specific consumer/publisher construction and payload generators (generateEvent, generateOrder) in this file, and replace direct calls to consumer.init()/publisher.init(), consumer.close()/publisher.close(), and the publish loop in runDirectBatchLoadTest with a call to the new core function so both runDirectBatchLoadTest and the direct-load-generator counterpart can share it.packages/kafka/load-tests/src/load-generator.ts (1)
32-37: Informational:delayMsis computed but not used for throttling.
batchesPerSecondanddelayMsare calculated and logged here, but the actual rate limiting (lines 67-74) uses a cumulative elapsed-time approach instead. This isn't wrong—the logged values provide useful context—but the two throttling models could confuse future maintainers.Consider either:
- Adding a comment clarifying that
delayMsis informational only- Or removing the unused calculation
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/src/load-generator.ts` around lines 32 - 37, The variables batchesPerSecond and delayMs in load-generator.ts are calculated only for logging and not used for throttling (throttling is handled by the cumulative elapsed-time logic later); update the code to avoid confusion by either removing the unused delayMs calculation or adding a clarifying comment near the log (around the console.log that prints batchesPerSecond and delayMs) that states delayMs is informational only and the actual throttling is implemented by the elapsed-time based loop (referencing batchesPerSecond and delayMs so reviewers can find the lines).packages/kafka/load-tests/src/metrics-collector.ts (1)
7-7: Memory consideration: unbounded latencies array.The
latenciesarray grows with each consumed message that has a timestamp. For extended load tests with millions of messages, this could consume significant memory. Consider either:
- Sampling latencies (e.g., record every Nth)
- Using a streaming percentile algorithm (e.g., t-digest)
- Periodically trimming old samples
For typical short-duration load tests, the current approach is fine.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/kafka/load-tests/src/metrics-collector.ts` at line 7, The latencies array (latencies: number[]) is unbounded and can grow to O(messages), so replace it with a bounded/summarizing structure: either implement sampling (add a sampleRate config and only push to latencies when counter % sampleRate === 0), or swap the array for a streaming percentile structure (e.g., a TDigest or reservoir sampler instance) and call its add/merge methods where the code currently pushes into latencies; also add an optional maxSamples cap and eviction/rotation logic if you prefer trimming. Locate all places referencing latencies (the latencies field and any methods that push to it) and change them to use the new sampler/tDigest API or the sampleRate check; ensure reporting functions that read latencies are updated to compute percentiles from the new structure or from the sampled array.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@packages/kafka/load-tests/package.json`:
- Around line 10-25: The package.json scripts run TypeScript files directly
(e.g., scripts "load:cdc", "load:cdc:light", "load:direct", "load:direct:batch"
that call node src/run.ts, src/run-batch.ts, src/run-direct.ts,
src/run-direct-batch.ts) which requires either Node 22.18.0+ or the
--experimental-strip-types flag for older 22.x; update each script that invokes
node on a .ts file to prefix the node command with --experimental-strip-types
(e.g., node --experimental-strip-types src/run.ts) or alternatively add a clear
README/engine field documenting Node >=22.18.0 as a requirement so CI and devs
know not to use older runtimes.
In `@packages/kafka/load-tests/scripts/init-crdb.sh`:
- Around line 36-42: Make the changefeed creation idempotent: before running the
CREATE CHANGEFEED for events, orders check for an existing changefeed and skip
or cancel it first; for example, query the cluster's changefeeds (e.g., SHOW
CHANGEFEEDS or inspect system jobs for job_type=CHANGEFEED) to find any
changefeed targeting events/orders and either CANCEL the job or skip creation,
then run the CREATE CHANGEFEED only if none exists; alternatively wrap the
CREATE step in error-handling in the script to catch the "already exists" error
and ignore it so repeated runs do not fail.
In `@packages/kafka/load-tests/src/cdc-batch-consumer.ts`:
- Line 10: Change the import so CDC_TOPICS_CONFIG is imported as a type-only
symbol; update the import line in cdc-batch-consumer.ts to keep CDC_EVENT_SCHEMA
and CDC_ORDER_SCHEMA as value imports but import CDC_TOPICS_CONFIG (and the
CdcEvent/CdcOrder types) with the type qualifier (e.g. import {
CDC_EVENT_SCHEMA, CDC_ORDER_SCHEMA, type CDC_TOPICS_CONFIG, type CdcEvent, type
CdcOrder } from './cdc-schemas.ts') so CDC_TOPICS_CONFIG is not treated as a
runtime value.
In `@packages/kafka/load-tests/src/cdc-consumer.ts`:
- Line 10: The import is mixing value and type imports; make CDC_TOPICS_CONFIG a
type-only import to match cdc-batch-consumer.ts: keep CDC_EVENT_SCHEMA and
CDC_ORDER_SCHEMA as value imports but import CDC_TOPICS_CONFIG (and the
CdcEvent/CdcOrder types) using an import type so CDC_TOPICS_CONFIG is not
emitted at runtime; update the import statement that currently references
CDC_EVENT_SCHEMA, CDC_ORDER_SCHEMA, CDC_TOPICS_CONFIG, CdcEvent, CdcOrder
accordingly.
In `@packages/kafka/load-tests/src/direct-schemas.ts`:
- Line 1: The file incorrectly uses a default import from Zod ("import z from
'zod/v4'") which doesn't exist; replace it with a valid import such as a named
import "import { z } from 'zod/v4'" or a namespace import "import * as z from
'zod'" so that subsequent uses of the z symbol (e.g., any calls to z.object,
z.string, etc.) resolve correctly; update the import line only and ensure no
other code changes are necessary.
---
Nitpick comments:
In `@packages/kafka/load-tests/docker-compose.yml`:
- Around line 29-30: The docker-compose service "cockroachdb" currently uses the
floating tag "cockroachdb/cockroach:latest-v25.1"; change this to a pinned
immutable tag (for example "cockroachdb/cockroach:v25.1.0" or another exact
patch release) in the "image" field so load tests are reproducible and don't
shift when the upstream tag changes.
- Around line 56-57: The docker-compose service "kafka-ui" uses the floating
image tag provectuslabs/kafka-ui:latest which can introduce breaking changes;
update the kafka-ui service definition to pin the image to a specific, tested
version (e.g., provectuslabs/kafka-ui:<stable-version>) and document the chosen
version; locate the kafka-ui service entry and replace the :latest tag with the
selected semantic version or digest and update any related deployment notes or
README to record the pinned version for future upgrades.
In `@packages/kafka/load-tests/README.md`:
- Around line 85-87: The fenced code block containing the ASCII diagram lacks a
language specifier; update the triple-backtick fence around the diagram in the
README (the block that currently contains "Load Generator → CockroachDB
(inserts) → CDC Changefeed → Kafka → Consumer → Metrics") to include a language
tag such as text or plaintext (e.g., ```text) so markdown linting passes and the
diagram is treated as plain text.
- Around line 96-98: The fenced code block containing the arrow diagram "Load
Generator → AbstractKafkaPublisher → Kafka → Consumer → Metrics" is missing a
language specifier; update the opening fence from ``` to ```text so it becomes a
text code block and preserves formatting/escaping in Markdown and matches the
CDC diagram fix pattern.
In `@packages/kafka/load-tests/src/batch-load-generator.ts`:
- Around line 7-13: The BatchLoadTestOptions interface is duplicated; extract it
into a shared types module and import it from both places to avoid drift: create
a new exported interface named BatchLoadTestOptions in a common types file,
remove the duplicate declarations in batch-load-generator.ts and
direct-batch-load-generator.ts, and update both files to import {
BatchLoadTestOptions } from the new module so the same definition is referenced
everywhere.
- Around line 49-58: totalInserted is incremented before the async inserts
complete, so failed inserts are counted as successes; move the mutation of
totalInserted into the success path and/or maintain a separate failure counter:
remove or stop updating totalInserted before Promise.all, then inside the
Promise.all .then() callback (after crdb.insertEvents/crdb.insertOrders succeed
and metrics.recordProduced is called) increment totalInserted by currentBatch;
additionally, in the .catch() increment a new failedInserted (or failedBatches)
metric so final reports reflect actual successes vs failures; keep inflight-- in
.finally() as-is.
In `@packages/kafka/load-tests/src/cdc-batch-consumer.ts`:
- Line 73: The load-test batch consumer currently has logMessages: true which
will produce excessive output under high throughput; update the consumer config
used by the Cdc batch consumer (the object containing logMessages) to set
logMessages: false to match the non-batch CdcConsumer and reduce noise during
load tests, ensuring any places that instantiate or export that config (e.g.,
the CdcBatchConsumer configuration object) use the new value.
In `@packages/kafka/load-tests/src/direct-batch-load-generator.ts`:
- Around line 17-34: The helpers generateEvent and generateOrder are duplicated
here and in direct-load-generator.ts; extract both functions into a shared
module (e.g., test-data-generators.ts or direct-schemas.ts), export them
(generateEvent, generateOrder), then import and use those exports in
direct-batch-load-generator.ts (and direct-load-generator.ts) to remove
duplication; ensure the exported functions keep the same signatures and return
types (DirectEvent, DirectOrder) so callers need no changes.
- Around line 1-103: The file duplicates orchestration logic already in
direct-load-generator.ts; refactor by extracting the shared load-test
orchestration into a single function (e.g., runLoadTestCore) that accepts
injected components/factories and options, then modify runDirectBatchLoadTest to
call that core with DirectBatchConsumer, DirectPublisher, MetricsCollector and
the BatchLoadTestOptions; specifically, move common setup (MetricsCollector
creation, publisher/consumer init, publish loop, rate throttling, drain/wait
logic, reporting and shutdown) into the core, keep only the variant-specific
consumer/publisher construction and payload generators (generateEvent,
generateOrder) in this file, and replace direct calls to
consumer.init()/publisher.init(), consumer.close()/publisher.close(), and the
publish loop in runDirectBatchLoadTest with a call to the new core function so
both runDirectBatchLoadTest and the direct-load-generator counterpart can share
it.
In `@packages/kafka/load-tests/src/load-generator.ts`:
- Around line 32-37: The variables batchesPerSecond and delayMs in
load-generator.ts are calculated only for logging and not used for throttling
(throttling is handled by the cumulative elapsed-time logic later); update the
code to avoid confusion by either removing the unused delayMs calculation or
adding a clarifying comment near the log (around the console.log that prints
batchesPerSecond and delayMs) that states delayMs is informational only and the
actual throttling is implemented by the elapsed-time based loop (referencing
batchesPerSecond and delayMs so reviewers can find the lines).
In `@packages/kafka/load-tests/src/metrics-collector.ts`:
- Line 7: The latencies array (latencies: number[]) is unbounded and can grow to
O(messages), so replace it with a bounded/summarizing structure: either
implement sampling (add a sampleRate config and only push to latencies when
counter % sampleRate === 0), or swap the array for a streaming percentile
structure (e.g., a TDigest or reservoir sampler instance) and call its add/merge
methods where the code currently pushes into latencies; also add an optional
maxSamples cap and eviction/rotation logic if you prefer trimming. Locate all
places referencing latencies (the latencies field and any methods that push to
it) and change them to use the new sampler/tDigest API or the sampleRate check;
ensure reporting functions that read latencies are updated to compute
percentiles from the new structure or from the sampled array.
ℹ️ Review info
Configuration used: defaults
Review profile: CHILL
Plan: Pro
⛔ Files ignored due to path filters (1)
packages/kafka/load-tests/package-lock.jsonis excluded by!**/package-lock.json
📒 Files selected for processing (24)
packages/kafka/load-tests/.gitattributespackages/kafka/load-tests/README.mdpackages/kafka/load-tests/docker-compose.ymlpackages/kafka/load-tests/package.jsonpackages/kafka/load-tests/scripts/init-crdb.shpackages/kafka/load-tests/src/batch-load-generator.tspackages/kafka/load-tests/src/cdc-batch-consumer.tspackages/kafka/load-tests/src/cdc-consumer.tspackages/kafka/load-tests/src/cdc-schemas.tspackages/kafka/load-tests/src/config.tspackages/kafka/load-tests/src/crdb-client.tspackages/kafka/load-tests/src/direct-batch-consumer.tspackages/kafka/load-tests/src/direct-batch-load-generator.tspackages/kafka/load-tests/src/direct-consumer.tspackages/kafka/load-tests/src/direct-load-generator.tspackages/kafka/load-tests/src/direct-publisher.tspackages/kafka/load-tests/src/direct-schemas.tspackages/kafka/load-tests/src/load-generator.tspackages/kafka/load-tests/src/metrics-collector.tspackages/kafka/load-tests/src/run-batch.tspackages/kafka/load-tests/src/run-direct-batch.tspackages/kafka/load-tests/src/run-direct.tspackages/kafka/load-tests/src/run.tspackages/kafka/load-tests/tsconfig.json
| @@ -0,0 +1,24 @@ | |||
| import z from 'zod/v4' | |||
There was a problem hiding this comment.
🧩 Analysis chain
🏁 Script executed:
cat packages/kafka/package.json | grep -A 5 -B 5 '"zod"'Repository: kibertoad/message-queue-toolkit
Length of output: 628
🌐 Web query:
Zod 4 correct import syntax zod/v4 documentation
💡 Result:
For Zod v4, you can import either way:
// Recommended (since July 8, 2025: package root "zod" exports v4)
import * as z from "zod";// Still supported forever (explicit v4 subpath)
import { z } from "zod/v4";Zod’s versioning docs also note: Zod 3 is now imported via "zod/v3". [1] [2]
Sources: [1] [2]
Fix incorrect Zod import syntax.
The import uses import z from 'zod/v4' (default import), but Zod v4 does not export a default. Change to either import { z } from 'zod/v4' (named import) or import * as z from 'zod' (recommended modern syntax).
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@packages/kafka/load-tests/src/direct-schemas.ts` at line 1, The file
incorrectly uses a default import from Zod ("import z from 'zod/v4'") which
doesn't exist; replace it with a valid import such as a named import "import { z
} from 'zod/v4'" or a namespace import "import * as z from 'zod'" so that
subsequent uses of the z symbol (e.g., any calls to z.object, z.string, etc.)
resolve correctly; update the import line only and ensure no other code changes
are necessary.
Summary by CodeRabbit
New Features
Documentation
Chores