Boto3 timeout troubleshooting
Question:
I am trying to troubleshoot a situation.
I am initiating a Boto3 client like this:
s3_client = boto3.client('s3')
Then I am iterating over a number of files and uploading them using:
s3_client.upload_file()
My problem is that every now and then I see it pausing for 60 seconds and then continuing normally.
I’ve tried reducing the timeout value and the error I seem to be getting is:
botocore.exceptions.ConnectTimeoutError
or
urllib3.exceptions.ConnectTimeoutError
If I leave it at 60, eventually it succeeds and I don’t get any errors.
My question is, this error means that when executing upload_file, it tried to send a put request to the server and the server didn’t respond to that request?
When initiating the client, is any connection established that could be lost or that’s simply only storing the credentials and it’s irrelevant to this issue?
Many thanks.
Update: Adding more detailed logs:
CRITICAL Connect timeout
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 169, in _new_conn
conn = connection.create_connection(
File "/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 96, in create_connection
raise err
File "/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 86, in create_connection
sock.connect(sa)
TimeoutError: timed out
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/user/.local/lib/python3.10/site-packages/botocore/httpsession.py", line 439, in send
urllib_response = conn.urlopen(
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 755, in urlopen
retries = retries.increment(
File "/usr/lib/python3/dist-packages/urllib3/util/retry.py", line 507, in increment
raise six.reraise(type(error), error, _stacktrace)
File "/usr/lib/python3/dist-packages/six.py", line 719, in reraise
raise value
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 699, in urlopen
httplib_response = self._make_request(
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 382, in _make_request
self._validate_conn(conn)
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 1012, in _validate_conn
conn.connect()
File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 353, in connect
conn = self._new_conn()
File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 174, in _new_conn
raise ConnectTimeoutError(
urllib3.exceptions.ConnectTimeoutError
During handling of the above exception, another exception occurred:
File "/home/user/.local/lib/python3.10/site-packages/boto3/s3/inject.py", line 143, in upload_file
return transfer.upload_file(
File "/home/user/.local/lib/python3.10/site-packages/boto3/s3/transfer.py", line 288, in upload_file
future.result()
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/futures.py", line 103, in result
return self._coordinator.result()
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/futures.py", line 266, in result
raise self._exception
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/tasks.py", line 139, in __call__
return self._execute_main(kwargs)
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/tasks.py", line 162, in _execute_main
return_value = self._main(**kwargs)
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/upload.py", line 758, in _main
client.put_object(Bucket=bucket, Key=key, Body=body, **extra_args)
File "/home/user/.local/lib/python3.10/site-packages/botocore/client.py", line 415, in _api_call
return self._make_api_call(operation_name, kwargs)
File "/home/user/.local/lib/python3.10/site-packages/botocore/client.py", line 731, in _make_api_call
http, parsed_response = self._make_request(
File "/home/user/.local/lib/python3.10/site-packages/botocore/client.py", line 751, in _make_request
return self._endpoint.make_request(operation_model, request_dict)
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 107, in make_request
return self._send_request(request_dict, operation_model)
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 183, in _send_request
while self._needs_retry(attempts, operation_model, request_dict,
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 305, in _needs_retry
responses = self._event_emitter.emit(
File "/home/user/.local/lib/python3.10/site-packages/botocore/hooks.py", line 358, in emit
return self._emitter.emit(aliased_event_name, **kwargs)
File "/home/user/.local/lib/python3.10/site-packages/botocore/hooks.py", line 229, in emit
return self._emit(event_name, kwargs)
File "/home/user/.local/lib/python3.10/site-packages/botocore/hooks.py", line 212, in _emit
response = handler(**kwargs)
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 194, in __call__
if self._checker(**checker_kwargs):
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 267, in __call__
should_retry = self._should_retry(attempt_number, response,
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 294, in _should_retry
return self._checker(attempt_number, response, caught_exception)
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 333, in __call__
checker_response = checker(attempt_number, response,
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 233, in __call__
return self._check_caught_exception(
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 376, in _check_caught_exception
raise caught_exception
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 249, in _do_get_response
http_response = self._send(request)
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 321, in _send
return self.http_session.send(request)
File "/home/user/.local/lib/python3.10/site-packages/botocore/httpsession.py", line 472, in send
raise ConnectTimeoutError(endpoint_url=request.url, error=e)
Answers:
The default boto3 retry mode (Legacy) doesn’t properly handle a number of errors/exceptions, including RequestThrottled, PriorRequestNotComplete, ConnectionError and BandwidthLimitExceeded. It can manifest as very intermittent problems with long delays and repeated connection failures. You’ll likely be better off using the Standard retry mode instead, which also has an exponential backoff.
import boto3
from botocore.client import Config as BotoConfig
TIMEOUT = 3
config = BotoConfig(connect_timeout=TIMEOUT, retries={"mode": "standard"})
client = boto3.client("s3", config=config)
I am trying to troubleshoot a situation.
I am initiating a Boto3 client like this:
s3_client = boto3.client('s3')
Then I am iterating over a number of files and uploading them using:
s3_client.upload_file()
My problem is that every now and then I see it pausing for 60 seconds and then continuing normally.
I’ve tried reducing the timeout value and the error I seem to be getting is:
botocore.exceptions.ConnectTimeoutError
or
urllib3.exceptions.ConnectTimeoutError
If I leave it at 60, eventually it succeeds and I don’t get any errors.
My question is, this error means that when executing upload_file, it tried to send a put request to the server and the server didn’t respond to that request?
When initiating the client, is any connection established that could be lost or that’s simply only storing the credentials and it’s irrelevant to this issue?
Many thanks.
Update: Adding more detailed logs:
CRITICAL Connect timeout
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 169, in _new_conn
conn = connection.create_connection(
File "/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 96, in create_connection
raise err
File "/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 86, in create_connection
sock.connect(sa)
TimeoutError: timed out
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/user/.local/lib/python3.10/site-packages/botocore/httpsession.py", line 439, in send
urllib_response = conn.urlopen(
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 755, in urlopen
retries = retries.increment(
File "/usr/lib/python3/dist-packages/urllib3/util/retry.py", line 507, in increment
raise six.reraise(type(error), error, _stacktrace)
File "/usr/lib/python3/dist-packages/six.py", line 719, in reraise
raise value
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 699, in urlopen
httplib_response = self._make_request(
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 382, in _make_request
self._validate_conn(conn)
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 1012, in _validate_conn
conn.connect()
File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 353, in connect
conn = self._new_conn()
File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 174, in _new_conn
raise ConnectTimeoutError(
urllib3.exceptions.ConnectTimeoutError
During handling of the above exception, another exception occurred:
File "/home/user/.local/lib/python3.10/site-packages/boto3/s3/inject.py", line 143, in upload_file
return transfer.upload_file(
File "/home/user/.local/lib/python3.10/site-packages/boto3/s3/transfer.py", line 288, in upload_file
future.result()
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/futures.py", line 103, in result
return self._coordinator.result()
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/futures.py", line 266, in result
raise self._exception
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/tasks.py", line 139, in __call__
return self._execute_main(kwargs)
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/tasks.py", line 162, in _execute_main
return_value = self._main(**kwargs)
File "/home/user/.local/lib/python3.10/site-packages/s3transfer/upload.py", line 758, in _main
client.put_object(Bucket=bucket, Key=key, Body=body, **extra_args)
File "/home/user/.local/lib/python3.10/site-packages/botocore/client.py", line 415, in _api_call
return self._make_api_call(operation_name, kwargs)
File "/home/user/.local/lib/python3.10/site-packages/botocore/client.py", line 731, in _make_api_call
http, parsed_response = self._make_request(
File "/home/user/.local/lib/python3.10/site-packages/botocore/client.py", line 751, in _make_request
return self._endpoint.make_request(operation_model, request_dict)
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 107, in make_request
return self._send_request(request_dict, operation_model)
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 183, in _send_request
while self._needs_retry(attempts, operation_model, request_dict,
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 305, in _needs_retry
responses = self._event_emitter.emit(
File "/home/user/.local/lib/python3.10/site-packages/botocore/hooks.py", line 358, in emit
return self._emitter.emit(aliased_event_name, **kwargs)
File "/home/user/.local/lib/python3.10/site-packages/botocore/hooks.py", line 229, in emit
return self._emit(event_name, kwargs)
File "/home/user/.local/lib/python3.10/site-packages/botocore/hooks.py", line 212, in _emit
response = handler(**kwargs)
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 194, in __call__
if self._checker(**checker_kwargs):
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 267, in __call__
should_retry = self._should_retry(attempt_number, response,
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 294, in _should_retry
return self._checker(attempt_number, response, caught_exception)
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 333, in __call__
checker_response = checker(attempt_number, response,
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 233, in __call__
return self._check_caught_exception(
File "/home/user/.local/lib/python3.10/site-packages/botocore/retryhandler.py", line 376, in _check_caught_exception
raise caught_exception
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 249, in _do_get_response
http_response = self._send(request)
File "/home/user/.local/lib/python3.10/site-packages/botocore/endpoint.py", line 321, in _send
return self.http_session.send(request)
File "/home/user/.local/lib/python3.10/site-packages/botocore/httpsession.py", line 472, in send
raise ConnectTimeoutError(endpoint_url=request.url, error=e)
The default boto3 retry mode (Legacy) doesn’t properly handle a number of errors/exceptions, including RequestThrottled, PriorRequestNotComplete, ConnectionError and BandwidthLimitExceeded. It can manifest as very intermittent problems with long delays and repeated connection failures. You’ll likely be better off using the Standard retry mode instead, which also has an exponential backoff.
import boto3
from botocore.client import Config as BotoConfig
TIMEOUT = 3
config = BotoConfig(connect_timeout=TIMEOUT, retries={"mode": "standard"})
client = boto3.client("s3", config=config)