ecs.describe_services response has inconsistencies depending on Capacity Provider Strategy

Describe the bug ecs.describe_services response has following inconsistencies depending on Capacity Provider Strategy (CSP) of the cluster:

• service.launchType key is not included when CSP is set (must be a string)
• service.capacityProviderStrategy key is not included when CSP is not set (must be an Array)

CLI (aws ecs describe-services) is behaving similarly so I guess it’s the API response that is inconsistent.

Expected behavior service.launchType and service.capacityProviderStrategy should return as per documentation or documentation should be updated.

Debug logs

2021-05-06 16:37:39,291 botocore.hooks [DEBUG] Event before-parameter-build.ecs.DescribeServices: calling handler <function generate_idempotent_uuid at 0x106e02ca0>
2021-05-06 16:37:39,291 botocore.hooks [DEBUG] Event before-call.ecs.DescribeServices: calling handler <function inject_api_version_header_if_needed at 0x106e0a550>
2021-05-06 16:37:39,291 botocore.endpoint [DEBUG] Making request for OperationModel(name=DescribeServices) with params: {'url_path': '/', 'query_string': '', 'method': 'POST', 'headers': {'X-Amz-Target': 'AmazonEC2ContainerServiceV20141113.DescribeServices', 'Content-Type': 'application/x-amz-json-1.1', 'User-Agent': 'Boto3/1.17.53 Python/3.9.4 Darwin/19.6.0 Botocore/1.20.53'}, 'body': b'{"cluster": "**REDACTED**", "services": ["**REDACTED**"]}', 'url': 'https://ecs.ap-northeast-1.amazonaws.com/', 'context': {'client_region': 'ap-northeast-1', 'client_config': <botocore.config.Config object at 0x108a7f610>, 'has_streaming_input': False, 'auth_type': None}}
2021-05-06 16:37:39,292 botocore.hooks [DEBUG] Event request-created.ecs.DescribeServices: calling handler <bound method RequestSigner.handler of <botocore.signers.RequestSigner object at 0x108a7f460>>
2021-05-06 16:37:39,292 botocore.hooks [DEBUG] Event choose-signer.ecs.DescribeServices: calling handler <function set_operation_specific_signer at 0x106e02b80>
2021-05-06 16:37:39,293 botocore.auth [DEBUG] Calculating signature using v4 auth.
2021-05-06 16:37:39,293 botocore.auth [DEBUG] CanonicalRequest:
POST
/

content-type:application/x-amz-json-1.1
host:ecs.ap-northeast-1.amazonaws.com
x-amz-date:20210506T073739Z
x-amz-target:AmazonEC2ContainerServiceV20141113.DescribeServices

content-type;host;x-amz-date;x-amz-target
ea9caeb8118ea22f53c25795e1ee25fa78c8ea4f5a3752e6b29ae176226ce118
2021-05-06 16:37:39,293 botocore.auth [DEBUG] StringToSign:
AWS4-HMAC-SHA256
20210506T073739Z
20210506/ap-northeast-1/ecs/aws4_request
28373c3b485368704527738109a806587eedf05fdd9868856e10df57a19df9d9
2021-05-06 16:37:39,294 botocore.auth [DEBUG] Signature:
81cfc67eb79d4ebad10e4f8f0f87b389bd43bb859ae780b42826a55225d1deda
2021-05-06 16:37:39,294 botocore.endpoint [DEBUG] Sending http request: <AWSPreparedRequest stream_output=False, method=POST, url=https://ecs.ap-northeast-1.amazonaws.com/, headers={'X-Amz-Target': b'AmazonEC2ContainerServiceV20141113.DescribeServices', 'Content-Type': b'application/x-amz-json-1.1', 'User-Agent': b'Boto3/1.17.53 Python/3.9.4 Darwin/19.6.0 Botocore/1.20.53', 'X-Amz-Date': b'20210506T073739Z', 'Authorization': b'AWS4-HMAC-SHA256 Credential=**REDACTED**/20210506/ap-northeast-1/ecs/aws4_request, SignedHeaders=content-type;host;x-amz-date;x-amz-target, Signature=81cfc67eb79d4ebad10e4f8f0f87b389bd43bb859ae780b42826a55225d1deda', 'Content-Length': '58'}>
2021-05-06 16:37:39,295 botocore.httpsession [DEBUG] Certificate path: /usr/local/lib/python3.9/site-packages/certifi/cacert.pem
2021-05-06 16:37:39,295 urllib3.connectionpool [DEBUG] Starting new HTTPS connection (1): ecs.ap-northeast-1.amazonaws.com:443
2021-05-06 16:37:40,214 urllib3.connectionpool [DEBUG] https://ecs.ap-northeast-1.amazonaws.com:443 "POST / HTTP/1.1" 200 17877
2021-05-06 16:37:40,230 botocore.parsers [DEBUG] Response headers: {'x-amzn-RequestId': 'ce9b5417-fac3-44a0-ad3b-5b0f0260372f', 'Content-Type': 'application/x-amz-json-1.1', 'Content-Length': '17877', 'Date': 'Thu, 06 May 2021 07:37:39 GMT'}
2021-05-06 16:37:40,230 botocore.parsers [DEBUG] Response body:
b'{"failures":[],"services":[{"capacityProviderStrategy":[{"base":1,"capacityProvider":"FARGATE_SPOT","weight":4},{"base":0,"capacityProvider":"FARGATE","weight":1}],"clusterArn":"arn:aws:ecs:ap-northeast-1:**REDACTED**:cluster/**REDACTED**","createdAt":1.61587561861E9,"createdBy":"arn:aws:iam::**REDACTED**:user/**REDACTED**","deploymentConfiguration":{"deploymentCircuitBreaker":{"enable":true,"rollback":true},"maximumPercent":200,"minimumHealthyPercent":100},"deployments":[{"capacityProviderStrategy":[{"base":1,"capacityProvider":"FARGATE_SPOT","weight":4},{"base":0,"capacityProvider":"FARGATE","weight":1}],"createdAt":1.620044771468E9,"desiredCount":1,"failedTasks":0,"id":"ecs-svc/3702460895490032237","networkConfiguration":{"awsvpcConfiguration":{"assignPublicIp":"ENABLED","securityGroups":["sg-**REDACTED**"],"subnets":["subnet-**REDACTED**","subnet-**REDACTED**","subnet-**REDACTED**"]}},"pendingCount":0,"platformVersion":"1.4.0","rolloutState":"COMPLETED","rolloutStateReason":"ECS deployment ecs-svc/3702460895490032237 completed.","runningCount":1,"status":"PRIMARY","taskDefinition":"arn:aws:ecs:ap-northeast-1:**REDACTED**:task-definition/**REDACTED**-production:33","updatedAt":1.620044996111E9}],"desiredCount":1,"enableECSManagedTags":true,"enableExecuteCommand":true,"events":[{"createdAt":1.620282875304E9,"id":"b4460279-388e-487e-abe8-af7ee148c5fe","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.62026127325E9,"id":"678b08a6-2cd2-4c8d-96b9-664a17e15e8d","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620239626929E9,"id":"b44c10dc-4da2-41a0-b298-d2c805189cc1","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620217995223E9,"id":"30b44f64-8a01-4f80-a36d-faeb105c9fba","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620196355335E9,"id":"e912de33-777d-4d69-b43c-cab0207b64c9","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.6201747471E9,"id":"96dea312-481f-422e-83d4-c395d1af086b","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620153106073E9,"id":"bf5a7c2a-f82a-4004-8045-b5739d33ec5d","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620131474532E9,"id":"53f988ca-5a10-48ad-8b3c-e9772f19f53c","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620109861437E9,"id":"868094a9-4e86-4264-a1df-528676b9285e","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620088258907E9,"id":"7263ef87-7ef3-4c24-bf81-327d7b8fa181","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620066632616E9,"id":"e7dcb0dd-028b-40dd-a5ab-be7890bac4ce","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.620044996126E9,"id":"30fded8e-be29-4549-bb66-1c38f4d87eff","message":"(service **REDACTED**) has reached a steady 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arn:aws:elasticloadbalancing:ap-northeast-1:**REDACTED**:targetgroup/**REDACTED**/00d557f23bd83c99)"},{"createdAt":1.619543714502E9,"id":"327040a1-1a4a-4ea2-b339-cb3bbfc2aa34","message":"(service **REDACTED**) has started 1 tasks: (task ce34baadc386475aaa15eb9cb9f54cb1)."},{"createdAt":1.619530572888E9,"id":"07651861-ae0d-424f-9c6a-9592b7d5044b","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619508932944E9,"id":"4b104188-dac0-4e0e-af87-486809ab4a5f","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619487298694E9,"id":"d1a88fb8-5213-4596-9036-c5e4843ee90f","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619465657647E9,"id":"fd1f1419-22be-4b82-953b-3f1f0484fde9","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619464804211E9,"id":"52eac6ae-205a-4e91-b8e8-24e01b8f517e","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619457623411E9,"id":"7b0abadd-9eec-4aae-a80b-c3681e510b03","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619454807652E9,"id":"cb4f6d74-491c-4b84-9b4e-4e5faea8132b","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619448804606E9,"id":"9c272e8b-880e-42c1-96b2-76ea27347233","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619445266449E9,"id":"c25b8b77-1c21-4d17-989d-44e0c3de79e1","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619423628927E9,"id":"6f7397e9-e86b-4205-9156-1ceaffbdef2b","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619407869059E9,"id":"35ebc4ef-25bf-4c1d-b11a-87cd881892e6","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619386264941E9,"id":"599748ee-def7-454b-ad01-2d0a1ab2b60f","message":"(service **REDACTED**) has reached a steady 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state."},{"createdAt":1.61922206411E9,"id":"7ae86290-3d0d-43cf-875a-9201576602a3","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619208108576E9,"id":"7fe94e85-a99f-4bb4-b0ac-66b96198bf26","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619204053017E9,"id":"63008742-0bcc-48ab-8982-8f08ca9d10d9","message":"(service **REDACTED**) has reached a steady state."},{"createdAt":1.619204053016E9,"id":"23f12610-6688-44f4-906d-b341e2d5d708","message":"(service **REDACTED**) (deployment ecs-svc/2161043730866175087) deployment completed."},{"createdAt":1.619204031068E9,"id":"2cc32461-1c6c-4f74-a1df-35c1e5274cb3","message":"(service **REDACTED**) has stopped 1 running tasks: (task 6082da6ed31149cf99e977048c14fd8e)."},{"createdAt":1.619203997721E9,"id":"b4d25edb-4ab2-40cf-96a0-2fe52dc1109b","message":"(service **REDACTED**) has begun draining connections on 1 tasks."}],"healthCheckGracePeriodSeconds":0,"loadBalancers":[{"containerName":"app","containerPort":80,"targetGroupArn":"arn:aws:elasticloadbalancing:ap-northeast-1:**REDACTED**:targetgroup/**REDACTED**/00d557f23bd83c99"}],"networkConfiguration":{"awsvpcConfiguration":{"assignPublicIp":"ENABLED","securityGroups":["sg-**REDACTED**"],"subnets":["subnet-**REDACTED**","subnet-**REDACTED**","subnet-**REDACTED**"]}},"pendingCount":0,"placementConstraints":[],"placementStrategy":[],"platformVersion":"LATEST","propagateTags":"SERVICE","roleArn":"arn:aws:iam::**REDACTED**:role/aws-service-role/ecs.amazonaws.com/AWSServiceRoleForECS","runningCount":1,"schedulingStrategy":"REPLICA","serviceArn":"arn:aws:ecs:ap-northeast-1:**REDACTED**:service/**REDACTED**/**REDACTED**","serviceName":"**REDACTED**","serviceRegistries":[{"registryArn":"arn:aws:servicediscovery:ap-northeast-1:**REDACTED**:service/srv-r64h7zj4kpvo2qm6"}],"status":"ACTIVE","taskDefinition":"arn:aws:ecs:ap-northeast-1:**REDACTED**:task-definition/**REDACTED**-production:33","version":0}]}'
2021-05-06 16:37:40,236 botocore.hooks [DEBUG] Event needs-retry.ecs.DescribeServices: calling handler <botocore.retryhandler.RetryHandler object at 0x108a77190>
2021-05-06 16:37:40,236 botocore.retryhandler [DEBUG] No retry needed.

[kdaily]

Thanks for those detail,s @nerixim. I’m contacting the ECS team for more information.

[kdaily]

Based on the response you got back, I see capacityProviderStrategy in the service definition, but not launchType:

b'{"failures":[],"services":[{"capacityProviderStrategy":[{"base":1,"capacityProvider":"FARGATE_SPOT",

Can you please confirm the version of boto3 and the AWS CLI you are using? Thanks!