getSchema: multiple connections open on cache-miss

[pwmcintyre]

i have an issue when using Schema Registry with Lambda and NodeJS.

With Lambda, your function receives a batch (up to 100) of messages.

If you attempt to decode them concurrently, each with experience a cache-miss and open a new connection to fetch the schema.

https://github.com/kafkajs/confluent-schema-registry/blob/a3921d3cbd203eb7c41a0cb321b12a2608c7ecd8/src/SchemaRegistry.ts#L242C1-L246C6

Consider using a mutex to lock each schema by ID to avoid this.

Workaround: don't use concurrency when decoding?

[pwmcintyre]

is this repo maintained? I could supply a PR, but it doesn't look like PR's are being reviewed 😱

also appears to be using NodeJS 12.x (deprecated) and uses a docker compose spec which appears invalid?

$ npx yarn test
...
🌈 Dockest 🌈 [Exit Handler] Invalid schema.