area/runtimehelp wanted
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説明
Title: we should keep runtime's consistency during a request's lifecycle.
Description: runtime layers should be consistent during processing of a request.
Repro steps:
a bug scenario: filter A reads version 1 of runtime snapshot, filter A stopIteration, waits for a some callback result, say on-demand-rds a new Runtime snapshot (version 2) is pushed by RTDS, filter A resume the filter iteration, and filter B now sees version 2 when it reads from loader.runtime().snapshot()
IMO, We should latch the runtime snapshot to a stream during its creation time.