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feat: support for event loop debugging and slow tasks detection #1580

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feat: support for event loop debugging and slow tasks detection #1580

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b7673d5
feat: support for event loop debugging and slow tasks detection
YunchuWang Sep 24, 2024
9748a90
fix: linting
YunchuWang Sep 24, 2024
aa99fab
Merge branch 'dev' into wangbill/eventloop-debug
YunchuWang Oct 9, 2024
ec364ab
Merge branch 'dev' into wangbill/eventloop-debug
YunchuWang Oct 9, 2024
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6 changes: 6 additions & 0 deletions azure_functions_worker/constants.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,3 +93,9 @@

# Appsetting to specify AppInsights connection string
APPLICATIONINSIGHTS_CONNECTION_STRING = "APPLICATIONINSIGHTS_CONNECTION_STRING"

# New constant for event loop profiling
PYTHON_ENABLE_EVENT_LOOP_DEBUGGING = 'PYTHON_ENABLE_EVENT_LOOP_DEBUGGING'
PYTHON_DEBUGGING_EVENT_LOOP_SLOW_CALLBACK_THRESHOLD = \
'PYTHON_DEBUGGING_EVENT_LOOP_SLOW_CALLBAK_THRESHOLD'
PYTHON_DEBUGGING_EVENT_LOOP_SLOW_CALLBACK_THRESHOLD_DEFAULT = 600 # 10 minutes
19 changes: 19 additions & 0 deletions azure_functions_worker/dispatcher.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,10 @@
METADATA_PROPERTIES_WORKER_INDEXED,
PYTHON_AZURE_MONITOR_LOGGER_NAME,
PYTHON_AZURE_MONITOR_LOGGER_NAME_DEFAULT,
PYTHON_DEBUGGING_EVENT_LOOP_SLOW_CALLBACK_THRESHOLD,
PYTHON_DEBUGGING_EVENT_LOOP_SLOW_CALLBACK_THRESHOLD_DEFAULT,
PYTHON_ENABLE_DEBUG_LOGGING,
PYTHON_ENABLE_EVENT_LOOP_DEBUGGING,
PYTHON_ENABLE_INIT_INDEXING,
PYTHON_ENABLE_OPENTELEMETRY,
PYTHON_ENABLE_OPENTELEMETRY_DEFAULT,
Expand Down Expand Up @@ -353,6 +356,16 @@ def update_opentelemetry_status(self):
"Cannot import OpenTelemetry libraries."
)

def _setup_event_loop_profiling(self):
if is_envvar_true(PYTHON_ENABLE_EVENT_LOOP_DEBUGGING):
self._loop.set_debug(True)
self._loop.slow_callback_duration = \
get_app_setting(
PYTHON_DEBUGGING_EVENT_LOOP_SLOW_CALLBACK_THRESHOLD,
PYTHON_DEBUGGING_EVENT_LOOP_SLOW_CALLBACK_THRESHOLD_DEFAULT)
logger.info('Event loop debug mode enabled with 10-minute slow '
'callback detection')

async def _handle__worker_init_request(self, request):
logger.info('Received WorkerInitRequest, '
'python version %s, '
Expand Down Expand Up @@ -381,6 +394,10 @@ async def _handle__worker_init_request(self, request):
constants.RPC_HTTP_TRIGGER_METADATA_REMOVED: _TRUE,
constants.SHARED_MEMORY_DATA_TRANSFER: _TRUE,
}

# Set up event loop profiling
self._setup_event_loop_profiling()

if get_app_setting(setting=PYTHON_ENABLE_OPENTELEMETRY,
default_value=PYTHON_ENABLE_OPENTELEMETRY_DEFAULT):
self.initialize_azure_monitor()
Expand Down Expand Up @@ -760,6 +777,8 @@ async def _handle__function_environment_reload_request(self, request):
env_vars = func_env_reload_request.environment_variables
for var in env_vars:
os.environ[var] = env_vars[var]
# Enable event loop debug mode
self._setup_event_loop_profiling()

# Apply PYTHON_THREADPOOL_THREAD_COUNT
self._stop_sync_call_tp()
Expand Down
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