gortiz commented on issue #16060:
URL: https://github.com/apache/pinot/issues/16060#issuecomment-2969906025
This diagram is a bird's-eye view of the thread model on a server when
handling MSE requests.
The thread that
```mermaid
sequenceDiagram
box Grpc thread
participant GrpcServer
end
box Submission Thread
participant QueryServer
end
box ExecutionThread 1
participant QueryRunner
participant PipelineBreakerExecutor
end
box ExecutionThread 2
participant OpChainSchedulerService
end
participant MultiStageOperator
activate GrpcServer
GrpcServer ->> QueryServer: submit
activate QueryServer
QueryServer ->> QueryRunner: processQueryAsync
activate QueryRunner
QueryRunner -->> QueryServer: return not waiting
QueryServer -->> GrpcServer: return
deactivate QueryServer
deactivate GrpcServer
QueryRunner ->> QueryRunner: processQueryBlocking
QueryRunner ->> PipelineBreakerExecutor: executePipelineBreakers
PipelineBreakerExecutor ->> MultiStageOperator: nextBlock
Note right of MultiStageOperator: Starts new threads,<br/> but wait for
them
MultiStageOperator -->> PipelineBreakerExecutor: return
PipelineBreakerExecutor -->> QueryRunner: return
QueryRunner ->> OpChainSchedulerService: register
activate OpChainSchedulerService
OpChainSchedulerService -->> QueryRunner: return not waiting
deactivate QueryRunner
OpChainSchedulerService ->> MultiStageOperator: nextBlock
Note right of MultiStageOperator: Starts new threads,<br/> but wait for
them
MultiStageOperator -->> OpChainSchedulerService: return
deactivate OpChainSchedulerService
```
MultiStageOperators periodically call `sampleAndCheckInterruption`, which
could interrupt the thread and modify the operator to return an error block.
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