sollhui opened a new pull request, #64784:
URL: https://github.com/apache/doris/pull/64784
### What problem does this PR solve?
ThreadPool::do_submit could return a non-OK status after retaining the
submitted runnable in the token queue. This happened in the cold-start path
when the task was queued first and lazy creation of the first worker failed.
The caller would observe submit failure, but the task could still be retained
and run later if another submit created a worker.
This change creates the first worker before queueing the submitted task. If
first-worker creation fails, do_submit returns the error without retaining the
runnable. Later worker-creation failures are unchanged because existing workers
can still drain queued tasks.
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