Add ability to set observeOn buffer size per stage #800
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We've found that these buffers are very important tuning parameters. Additionally, they are very stage specific. Sometimes, you need want small buffers and other times large buffers depending on the performance characteristics of the stage. Setting them all via the default RX configuration is not a strong strategy. Especially because that needs to be set when mantis-agent spins up; not necessarily when the job spins up. This commit is mostly plumbing to get the buffer size to the stage executors.
| .map(observable -> c | ||
| .call(context, observable | ||
| .observeOn(Schedulers.computation()) | ||
| .observeOn(Schedulers.computation(), bufferSize) |
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This is the key update. The default will be the same rx.internal.util.RxRingBuffer.SIZE
timmartin-stripe
requested review from
Andyz26,
calvin681,
dtrager02,
fdc-ntflx,
hellolittlej and
james-lubin
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| // copy reference, then apply request specific filters, sampling | ||
| Observable<T> requestObservable = observableToServe; | ||
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| // decouple the observable on a separate thread and add backpressure handling |
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Never used. Figured it was good to clean up
Andyz26
approved these changes
Oct 24, 2025
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Context
We've found that these buffers are very important tuning parameters. Additionally, they are very stage specific. Sometimes, you need want small buffers and other times large buffers depending on the performance characteristics of the stage. Setting them all via the default RX configuration is not a strong strategy. Especially because that needs to be set when mantis-agent spins up; not necessarily when the job spins up.
This commit is mostly plumbing to get the buffer size to the stage executors.
Checklist
./gradlew buildcompiles code correctly./gradlew testpasses all tests