Introduce JOB_DISCONNECTED_RETRY_TIMEOUT#2627
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May 14, 2025
| else: | ||
| # No job_model.termination_reason set means ssh connection failed | ||
| if job_model.disconnected_at is None: | ||
| job_model.disconnected_at = common_utils.get_current_datetime() |
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Note that runner_ssh_tunnel also does 3 blocking retries, and each can take 15 seconds. So this disconnected_at can be imprecise, since we only set it after the runner_ssh_tunnel retries.
But I'm not sure we need to do anything about it. I thought about disabling the runner_ssh_tunnel retries in favor of the new disconnected_at retries, but having retry logic in both places may further improve stability.
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Thanks for pointing out. Let's keep both! :)
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Closes #2626
The PR changes process_running_jobs handling of ssh connection errors for pulling/running jobs. Previously, it failed jobs with no capacity after establishing ssh connection fails. Now, it keeps job active for at least JOB_DISCONNECTED_RETRY_TIMEOUT (2 minutes). This allows surviving temporary networking issues.
A possible regression is that dstack becomes slower to replace failed jobs/replicas. IMO, not a big problem since there are no expectations/guarantees on how quick the replacement is.
Later we can make timeout smarter depending on the job (e.g. short for spots, if retry enabled, etc). For now, keeping it as constant for simplicity.
Also introduced JobTerminationReason.INSTANCE_UNREACHABLE – not yet used because of backward compatibility.