我正在将任务从 AppEngine 任务队列转换为 Google Cloud 任务。
有问题的是每小时检查 S3 存储桶中是否有新文件的 cron 作业。 cron 作业针对找到的每个文件启动一个新任务。然后,这些任务下载各自的文件,并为文件中的每条记录启动一个新任务。
在此扇出期间,对 create_task()
的某些调用似乎失败并出现 ServiceUnavailable: 503 ( https://googleapis.dev/python/cloudtasks/latest/gapic/v2/api.html#google.cloud.tasks_v2.CloudTasksClient.create_task )
这是一个
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"}
]}
这是另一个
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}
]}
]}
我是否同时排队了太多任务?我该怎么办才能解决这个问题?
最佳答案
经过大量挖掘后,“503 服务不可用”似乎是所有 GCP 服务的 google-cloud SDK 中非常常见的错误。
- 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
解决方案是启用重试逻辑。 google-cloud-core
(google-cloud-tasks
所依赖的)具有现有的重试机制,但未针对任务创建进行配置。
retry_codes_name
设置为 non_idempot
而不是 idempot
"CreateTask": {
"timeout_millis": 10000,
"retry_codes_name": "non_idempotent",
"retry_params_name": "default",
},
我的猜测是,这可能会导致重复的任务排队。但如果您指定任务名称,google-cloud-tasks
应防止这些重复项排队。
因此,我将 Retry
对象传递给 .create_task()
,而没有为 predicate
提供参数,这导致它默认为 if_transient_error()
它将重试以下错误:exceptions.InternalServerError
、exceptions.TooManyRequests
、exceptions.ServiceUnavailable
下面是我创建任务的代码片段
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")
还有一个可用的记录器,您可以调整其级别,以便您可以看到实际重试时的日志语句。
如果您执行以下操作:
logging.getLogger('google.api_core.retry').setLevel(logging.DEBUG)
当它启动时,您应该在日志中看到类似这样的消息:
关于google-app-engine - Google Cloud Tasks 'Create Task' 请求抛出 ServiceUnavailable : 503,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60555770/