Google Cloud Tasks 'Create Task' request is throwing ServiceUnavailable: 503
I'm converting my Tasks from AppEngine TaskQueues to Google Cloud Tasks.
The one having problems is an hourly cron job that checks a S3 Bucket for new files. The cron job launches a new task per file found. Those tasks then download their respective files and launch a new task per record in their file.
It it during this fan-out that some of the calls to create_task() seem to fail with ServiceUnavailable: 503 (https://googleapis.dev/python/cloudtasks/latest/gapic/v2/api.html#google.cloud.tasks_v2.CloudTasksClient.create_task)
Heres one
Traceback (most recent call last):
...
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/src/utils/gc_tasks.py", line 72, in _gc_create_task
_ = _tasks_client.create_task(parent=_queue_path(DEFAULT_QUEUE), task=task)
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/cloud/tasks_v2/gapic/cloud_tasks_client.py", line 1512, in create_task
request, retry=retry, timeout=timeout, metadata=metadata
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/gapic_v1/method.py", line 143, in __call__
return wrapped_func(*args, **kwargs)
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/retry.py", line 273, in retry_wrapped_func
on_error=on_error,
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/retry.py", line 182, in retry_target
return target()
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/timeout.py", line 214, in func_with_timeout
return func(*args, **kwargs)
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/grpc_helpers.py", line 59, in error_remapped_callable
six.raise_from(exceptions.from_grpc_error(exc), exc)
File "/base/alloc/tmpfs/dynamic_runtimes/python27g/ebb3af67a06047b6/python27/python27_lib/versions/third_party/six-1.12.0/six/__init__.py", line 737, in raise_from
raise value
ServiceUnavailable: 503 {
"created":"@1583436423.131570193",
"description":"Delayed close due to in-progress write",
"file":"third_party/apphosting/python/grpcio/v1_0_0/src/core/ext/transport/chttp2/transport/chttp2_transport.c",
"file_line":412,
"grpc_status":14,
"referenced_errors":[{
"created":"@1583436423.131561040",
"description":"OS Error",
"errno":32,
"file":"third_party/apphosting/python/grpcio/v1_0_0/src/core/lib/iomgr/tcp_posix.c",
"file_line":393,
"os_error":"Broken pipe",
"syscall":"sendmsg"}
]}
Here's another
Traceback (most recent call last):
...
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/src/utils/pt_gc_tasks.py", line 72, in _gc_create_task
_ = _tasks_client.create_task(parent=_queue_path(DEFAULT_QUEUE), task=task)
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/cloud/tasks_v2/gapic/cloud_tasks_client.py", line 1512, in create_task
request, retry=retry, timeout=timeout, metadata=metadata
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/gapic_v1/method.py", line 143, in __call__
return wrapped_func(*args, **kwargs)
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/retry.py", line 273, in retry_wrapped_func
on_error=on_error,
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/retry.py", line 182, in retry_target
return target()
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/timeout.py", line 214, in func_with_timeout
return func(*args, **kwargs)
File "/base/data/home/apps/s~my_project/dev.XXXXXXXXXXXXXXXXXXX/lib/google/api_core/grpc_helpers.py", line 59, in error_remapped_callable
six.raise_from(exceptions.from_grpc_error(exc), exc)
File "/base/alloc/tmpfs/dynamic_runtimes/python27g/ebb3af67a06047b6/python27/python27_lib/versions/third_party/six-1.12.0/six/__init__.py", line 737, in raise_from
raise value
ServiceUnavailable: 503 {
"created":"@1583407622.505288938",
"description":"Endpoint read failed",
"file":"third_party/apphosting/python/grpcio/v1_0_0/src/core/ext/transport/chttp2/transport/chttp2_transport.c",
"file_line":1807,
"grpc_status":14,
"occurred_during_write":0,
"referenced_errors":[{
"created":"@1583407622.505108366",
"description":"Secure read failed",
"file":"third_party/apphosting/python/grpcio/v1_0_0/src/core/lib/security/transport/secure_endpoint.c",
"file_line":158,
"referenced_errors":[{
"created":"@1583407622.505106550",
"description":"Socket closed",
"file":"third_party/apphosting/python/grpcio/v1_0_0/src/core/lib/iomgr/tcp_posix.c",
"file_line":259}
]}
]}
Am I enqueuing too many tasks at the same time? What can I do to deal with this?
After quite a bit of digging, it seems that "503 Service Unavailable" is a pretty common error across the google-cloud SDKs for all of GCPs services.
- Why do I get 503 Service Unavailable errors using the Google Cloud Datastore API explorer?
- https://github.com/googleapis/google-cloud-python/issues/3128
- Error code 503 in GCP pubsub.v1.Subscriber.StreamingPull
The solution is to enable retry logic. google-cloud-core (which google-cloud-tasks depends on) has an existing retry mechanism, but it wasn't configured for task creation.
retry_codes_name was set to non_idempotent instead of idempotent
"CreateTask": {
"timeout_millis": 10000,
"retry_codes_name": "non_idempotent",
"retry_params_name": "default",
},
My guess is that this could cause duplicate tasks to get enqueued. But if you specify a task name, google-cloud-tasks should prevent those duplicates from getting enqueued.
So I passed a Retry object to .create_task() without providing an arg for predicate, which causes it to default to if_transient_error() which will retry for the following errors: exceptions.InternalServerError, exceptions.TooManyRequests, exceptions.ServiceUnavailable
Below is a snippet of my code to create tasks
from google.api_core import retry
from google.api_core.exceptions import AlreadyExists
from google.cloud import tasks
_tasks_client = tasks.CloudTasksClient()
def my_create_task_function(my_queue_path, task_object):
try:
_tasks_client.create_task(
parent=my_queue_path,
task=task_object,
retry=retry.Retry( # Copies the default retry config from retry_params in google.cloud.tasks_v2.gapic.cloud_tasks_client_config
initial=.1,
maximum=60,
multiplier=1.3,
deadline=600))
except AlreadyExists:
logging.warn("found existing task")
There is also a logger available that you can adjust the level of so that you can see log statements for when it actually does a retry.
If you do the following:
logging.getLogger('google.api_core.retry').setLevel(logging.DEBUG)
You should then see messages like this in your logs when it kicks in:
