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Print scheduler call stack when SIGUSR2 received #47311

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merged 6 commits into from
Mar 7, 2025
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Merged

Print scheduler call stack when SIGUSR2 received #47311

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036e9a0
Print scheduler call stack when SIGUSR2 received
jeffrey-harrison Mar 3, 2025
b69c09f
Remove duplicate lines
Jeffrharr Mar 3, 2025
c867681
Merge branch 'main' into print_scheduler_call_stack_sigusr2
Jeffrharr Mar 3, 2025
b5444b5
Merge branch 'main' into print_scheduler_call_stack_sigusr2
Jeffrharr Mar 6, 2025
19df77d
Merge branch 'main' into print_scheduler_call_stack_sigusr2
Jeffrharr Mar 6, 2025
8cf7dd2
Merge branch 'main' into print_scheduler_call_stack_sigusr2
Jeffrharr Mar 7, 2025
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10 changes: 10 additions & 0 deletions airflow/jobs/scheduler_job_runner.py
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Original file line number Diff line number Diff line change
Expand Up @@ -245,6 +245,9 @@ def _log_memory_usage(self, signum: int, frame: FrameType | None) -> None:
)

def _debug_dump(self, signum: int, frame: FrameType | None) -> None:
import threading
from traceback import extract_stack

if not _is_parent_process():
# Only the parent process should perform the debug dump.
return
Expand All @@ -261,6 +264,13 @@ def _debug_dump(self, signum: int, frame: FrameType | None) -> None:
executor.debug_dump()
self.log.info("-" * 80)

id2name = {th.ident: th.name for th in threading.enumerate()}
for threadId, stack in sys._current_frames().items():
self.log.info("Stack Trace for Scheduler Job Runner on thread: %s", id2name[threadId])
callstack = extract_stack(f=stack, limit=10)
self.log.info("\n\t".join(map(repr, callstack)))
self.log.info("-" * 80)

def _executable_task_instances_to_queued(self, max_tis: int, session: Session) -> list[TI]:
"""
Find TIs that are ready for execution based on conditions.
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5 changes: 4 additions & 1 deletion tests/jobs/test_scheduler_job.py
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Expand Up @@ -619,14 +619,17 @@ def test_executor_events_processed(self, mock_executors, configure_testing_dag_b
for executor in scheduler_job.executors:
executor.get_event_buffer.assert_called_once()

def test_executor_debug_dump(self, mock_executors):
@patch("traceback.extract_stack")
def test_executor_debug_dump(self, patch_traceback_extract_stack, mock_executors):
scheduler_job = Job()
self.job_runner = SchedulerJobRunner(job=scheduler_job, num_runs=1)
self.job_runner._debug_dump(1, mock.MagicMock())

for executor in scheduler_job.executors:
executor.debug_dump.assert_called_once()

patch_traceback_extract_stack.assert_called()

def test_find_executable_task_instances_backfill(self, dag_maker):
dag_id = "SchedulerJobTest.test_find_executable_task_instances_backfill"
task_id_1 = "dummy"
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