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Gintoki - a best practice for handling high traffic read only service

This project practice service which only read database. So how to scale up this to 1m req/min ? By using local caching and kafka to evict local cache explicitly. But it's very hard to deal with inconsistent caching. A multilocking mechanism by key is also a must in this project. It's written by Go and inspired by DDD and Hexagonal Architecture design. I believe this approach can scale up to 1m req/sec if it behind an L4 proxy

Components

There is 3 component in Gintoki:

  • A GRPC endpoint which allow callin GRPC traffic, serve high throughput endpoint
  • A HTTP-GRPC proxy serve http endpoint for http clients, it has also custom endpoint like prometheus metrics
  • A Kafka consumer which consume message from Kafka, update latest value to localcache Besides, I also implement logging and some middleware, so this project not only serve for PoC but also a pre-production ready release.

Performance

I only bench on my localmachine (Macbook Pro Core i5 8th quadcore) so the upperbound limit is still a mysterious number

If not using caching(only database), the limit maybe 600-800 req/sec:

echo "GET http://192.168.1.104:8080/cache?product_id=35586" | vegeta attack -rate=1000 -duration=60s | vegeta report
Requests      [total, rate, throughput]         60000, 1000.01, 481.02
Duration      [total, attack, wait]             1m28s, 59.999s, 27.757s
Latencies     [min, mean, 50, 90, 95, 99, max]  41.7µs, 1.036s, 46.711ms, 1.275s, 3.384s, 30s, 30.041s
Bytes In      [total, mean]                     24027032, 400.45
Bytes Out     [total, mean]                     0, 0.00
Success       [ratio]                           70.36%
Status Codes  [code:count]                      0:16223  200:42213  400:1564

With caching, it can serve upto without 10000 req/s any errors:

echo "GET http://192.168.1.104:8080/cache?product_id=35586" | vegeta attack -rate=10000 -duration=60s | vegeta report
Requests      [total, rate, throughput]         600000, 10000.03, 9999.99
Duration      [total, attack, wait]             1m0s, 1m0s, 219.241µs
Latencies     [min, mean, 50, 90, 95, 99, max]  104.294µs, 952.122µs, 209.047µs, 2.928ms, 6.256ms, 9.792ms, 49.215ms
Bytes In      [total, mean]                     340800000, 568.00
Bytes Out     [total, mean]                     0, 0.00
Success       [ratio]                           100.00%
Status Codes  [code:count]

And limit when I bench 20000 req/s because localmachine run out of available ports :(

echo "GET http://192.168.1.104:8080/cache?product_id=35586" | vegeta attack -rate=20000 -duration=60s | vegeta report
Requests      [total, rate, throughput]         457100, 6391.89, 4168.90
Duration      [total, attack, wait]             1m38s, 1m12s, 26.877s
Latencies     [min, mean, 50, 90, 95, 99, max]  89.174µs, 2.273s, 2.763ms, 608.898ms, 29.903s, 33.46s, 54.552s
Bytes In      [total, mean]                     232979400, 509.69
Bytes Out     [total, mean]                     0, 0.00
Success       [ratio]                           89.73%
Status Codes  [code:count]                      0:46925  200:410175
Get "http://192.168.1.104:8080/cache?product_id=35586": dial tcp 0.0.0.0:0->192.168.1.104:8080: bind: can't assign requested address

Dependencies:

  • Shopify/sarama Kafka consumer client.
  • allegro/bigcache which can serve upto gigabytes data

Usage:

In test-docker which you can start it, debezium connector will be plug into mysql binlog and produce data changes to kafka. Downstream service only to consume that table topic and evict cache explicitly

Contributing

All contributions are welcome.

License

This library is distributed under MIT license, see LICENSE