feat: read replica db for findByCid #1212
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samika98
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## develop #1212 +/- ##
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- Coverage 78.44% 78.20% -0.25%
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Files 47 48 +1
Lines 1935 1964 +29
Branches 309 314 +5
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| if (!request) { | ||
| throw new RequestDoesNotExistError(cid) | ||
| request = await this.requestRepository.findByCid(cid) | ||
| logger.debug(`Request not found in replica db for ${cid}, fetching from main_db`) |
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Nitpick: probably should go before line 61
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Thanks for catching this!
| throw new RequestDoesNotExistError(cid) | ||
| request = await this.requestRepository.findByCid(cid) | ||
| logger.debug(`Request not found in replica db for ${cid}, fetching from main_db`) | ||
| Metrics.count(METRIC_NAMES.REPLICA_DB_REQUEST_NOT_FOUND, 1) |
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Do we want to move this above line 61 (if line 61 errors, the metric won't be counted)
| @@ -69,6 +69,38 @@ export async function createDbConnection(dbConfig: Db = config.db): Promise<Knex | |||
| return connection | |||
| } | |||
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| export async function createReplicaDbConnection( | |||
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instead of having a separate function can we reuse the one above , I like the explicit key value pairs
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Also does this also need to do migrations (in case of future)
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I like having two separate functions. So that if in the future we want to disable a read replica, it would be easier to add that as a config, and add a check in app.ts. I like having a function do just one thing.
No we don't need any migrations, rds takes care of that
samika98
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[Read Replica] - #[https://linear.app/3boxlabs/issue/WS2-3238/create-a-separate-read-replica-to-improve-cas-performace]
Description
We noticed Knex connection pools getting exhausted during high load after some time. In order to scale CAS we have to introduce a separate read replica to handle the read calls. This will distribute the load between the replicas giving us better throughput
This PR has env vars defined to access the CAS-API : https://github.com/3box/ceramic-infra/pull/798/files#diff-7a1b7f1deef12acc800844bd1061eecf14fc08ded251a2363f32325a3210fcea
How Has This Been Tested?
TODO : Saw decreased latency monitored via data dog for read queries. Earlier read queries would take ~3-4 minutes under high load. We observe time in order of milli seconds for reads with this change
References:
Update ts for typed-inject compatibility : microsoft/TypeScript#37400. For some reason this bug was still present on ts 5.0.4 but not on the latest version which is 5.4.5
https://www.npmjs.com/package/typed-inject