Derek Collison c5fbb63614 JetStream ephemeral consumers could create a situation where the server would exhaust the OS thread limit - default 10k. ...

Under certain situations large number of consumers that are racing to update state or delete their stores during a delete
would start taking up OS threads due to blocking disk IO. When this happened and their were a bunch of Go routines becoming
runnable the Go runtime would create extra OS threads to fill in the runnable pool and would exhaust the max thread setting.

This code places a channel as a simple semaphore to limit the number of disk IO blocking OS threads.

Signed-off-by: Derek Collison <derek@nats.io>

2021-12-29 07:05:34 -08:00

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