Add thread-per-driver executor #18118
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core/trino-main/src/main/java/io/trino/execution/executor/RunningSplitInfo.java
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The test mixed class-level state with method-level state and wasn't consistent with everything that was going on in that class.
These objects don't need lifecycle managed throughout the test, so they can be created where they are needed
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In preparation for adding a ThreadPerSplitTaskExecutor
If there's an exception while the driver is being created, the error is not being propagated to the state machine. This can cause tasks to not be destroyed and blocked drivers to not be canceled.
* Uses a fair queue based on Completely Fair Scheduler * Runs each driver in a separate thread
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Implements a new split executor that uses a dedicated thread per split. Concurrency is controlled by parking and unparking threads after each execution quantum while ensuring each thread gets its fair share of compute resources. Replaces the multi-level feedback queue with a simpler implementation inspired on Linux's CFS scheduling algorithm.
Some benefits of this approach:
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(x) This is not user-visible or docs only and no release notes are required.