请求仍然失败 WSO2 API Manager 3.2.0 高可用性端点

Question

我们已经配置了 API 端点的高可用性，如此处所述https://apim.docs.wso2.com/en/3.2.0/learn/design-api/endpoints/high-availability-for-endpoints/#configuring-负载平衡端点

配置如下

EndpointType: Load Balanced
Endpoint Suspension State:
ErrorCode = Connection Failed and Connection Closed
Initial Duration = 1800000
Max Duration = 1800000
Factor = 1

EndPoint Timeout State:
Retries Before Suspension = 2
Retry Delay = 15000

使用上述设置，一些请求仍然被路由到挂起的端点并且失败，尽管端点已经挂起 state。

失败响应

{
  "fault": {
    "code": 303000,
    "type": "Status report",
    "message": "Runtime Error",
    "description": "Failover endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint - no ready child endpoints"
  }
}

{
  "fault": {
    "code": 101503,
    "type": "Status report",
    "message": "Runtime Error",
    "description": "Error connecting to the back end"
  }
}

错误信息如下

TID: [-1] [] [2023-01-09 12:25:48,776]  WARN {org.apache.synapse.transport.passthru.ConnectCallback} - Connection refused or failed for : /100.66.213.31:7010
TID: [-1234] [] [2023-01-09 12:25:48,777]  WARN {org.apache.synapse.endpoints.EndpointContext} - Endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0 with address http://100.66.213.31:7010/mcm-provider is marked as TIMEOUT and will be retried : 1 more time/s after : Mon Jan 09 12:26:03 UTC 2023 until its marked SUSPENDED for failure
TID: [-1234] [] [2023-01-09 12:25:48,777]  WARN {org.apache.synapse.endpoints.LoadbalanceEndpoint} - Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint] Detect a Failure in a child endpoint : Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0]
TID: [-1234] [] [2023-01-09 12:25:48,778]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - {api:admin--NewMCMInboundChannel-RESTAPIService:vv2} STATUS = Executing default 'fault' sequence, ERROR_CODE = 101503, ERROR_MESSAGE = Error connecting to the back end
TID: [-1] [] [2023-01-09 12:27:26,156]  WARN {org.apache.synapse.transport.passthru.ConnectCallback} - Connection refused or failed for : /100.66.213.31:7010
TID: [-1234] [] [2023-01-09 12:27:26,158]  WARN {org.apache.synapse.endpoints.EndpointContext} - Endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0 with address http://100.66.213.31:7010/mcm-provider is marked as TIMEOUT and will be retried : 0 more time/s after : Mon Jan 09 12:27:41 UTC 2023 until its marked SUSPENDED for failure
TID: [-1234] [] [2023-01-09 12:27:26,158]  WARN {org.apache.synapse.endpoints.LoadbalanceEndpoint} - Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint] Detect a Failure in a child endpoint : Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0]
TID: [-1234] [] [2023-01-09 12:27:26,158]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - {api:admin--NewMCMInboundChannel-RESTAPIService:vv2} STATUS = Executing default 'fault' sequence, ERROR_CODE = 101503, ERROR_MESSAGE = Error connecting to the back end
TID: [-1] [] [2023-01-09 12:31:36,455]  WARN {org.apache.synapse.transport.passthru.ConnectCallback} - Connection refused or failed for : /100.66.213.31:7010
TID: [-1234] [] [2023-01-09 12:31:36,459]  INFO {org.apache.synapse.endpoints.EndpointContext} - Endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0 with address http://100.66.213.31:7010/mcm-provider has been marked for SUSPENSION, but no further retries remain. Thus it will be SUSPENDED.
TID: [-1234] [] [2023-01-09 12:31:36,459]  WARN {org.apache.synapse.endpoints.EndpointContext} - Suspending endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0 with address http://100.66.213.31:7010/mcm-provider - current suspend duration is : 1800000ms - Next retry after : Mon Jan 09 13:01:36 UTC 2023
TID: [-1234] [] [2023-01-09 12:31:36,460]  WARN {org.apache.synapse.endpoints.LoadbalanceEndpoint} - Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint] Detect a Failure in a child endpoint : Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0]
TID: [-1234] [] [2023-01-09 12:31:36,460]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - {api:admin--NewMCMInboundChannel-RESTAPIService:vv2} STATUS = Executing default 'fault' sequence, ERROR_CODE = 101503, ERROR_MESSAGE = Error connecting to the back end

Answer 1

让我使用您的错误日志描述场景。

假设您有端点 0 和端点 1。

端点 1 按预期工作，端点 0 是错误的端点。 您已经为端点 2 配置了上述超时和暂停配置。

1. Endpoint_0 收到请求，但已超时。 由于您已将 2 配置为重试限制，因此它将再尝试两次并暂停请求，直到端点暂停持续时间。 由于已超时，服务器将暂时挂起此端点 15000 毫秒（重试延迟）。 在此之前，endpoint_1 为流量提供服务。

TID: [-1] [] [2023-01-09 12:25:48,776]  WARN {org.apache.synapse.transport.passthru.ConnectCallback} - Connection refused or failed for : /100.66.213.31:7010
TID: [-1234] [] [2023-01-09 12:25:48,777]  WARN {org.apache.synapse.endpoints.EndpointContext} - Endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0 with address http://100.66.213.31:7010/mcm-provider is marked as TIMEOUT and will be retried : 1 more time/s after : Mon Jan 09 12:26:03 UTC 2023 until its marked SUSPENDED for failure
TID: [-1234] [] [2023-01-09 12:25:48,777]  WARN {org.apache.synapse.endpoints.LoadbalanceEndpoint} - Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint] Detect a Failure in a child endpoint : Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0]
TID: [-1234] [] [2023-01-09 12:25:48,778]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - {api:admin--NewMCMInboundChannel-RESTAPIService:vv2} STATUS = Executing default 'fault' sequence, ERROR_CODE = 101503, ERROR_MESSAGE = Error connecting to the back end

2. 15000 毫秒后，endpoint_0 将服务于另一个请求。 这也超时，将被标记为暂停另外 15000 毫秒。

TID: [-1] [] [2023-01-09 12:27:26,156]  WARN {org.apache.synapse.transport.passthru.ConnectCallback} - Connection refused or failed for : /100.66.213.31:7010
TID: [-1234] [] [2023-01-09 12:27:26,158]  WARN {org.apache.synapse.endpoints.EndpointContext} - Endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0 with address http://100.66.213.31:7010/mcm-provider is marked as TIMEOUT and will be retried : 0 more time/s after : Mon Jan 09 12:27:41 UTC 2023 until its marked SUSPENDED for failure
TID: [-1234] [] [2023-01-09 12:27:26,158]  WARN {org.apache.synapse.endpoints.LoadbalanceEndpoint} - Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint] Detect a Failure in a child endpoint : Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0]
TID: [-1234] [] [2023-01-09 12:27:26,158]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - {api:admin--NewMCMInboundChannel-RESTAPIService:vv2} STATUS = Executing default 'fault' sequence, ERROR_CODE = 101503, ERROR_MESSAGE = Error connecting to the back end

3. 对 endpoint_0 的第三个连续请求已超时，并且没有任何重试。 端点将被标记为暂停，直到暂停持续时间。

TID: [-1] [] [2023-01-09 12:31:36,455]  WARN {org.apache.synapse.transport.passthru.ConnectCallback} - Connection refused or failed for : /100.66.213.31:7010
TID: [-1234] [] [2023-01-09 12:31:36,459]  INFO {org.apache.synapse.endpoints.EndpointContext} - Endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0 with address http://100.66.213.31:7010/mcm-provider has been marked for SUSPENSION, but no further retries remain. Thus it will be SUSPENDED.
TID: [-1234] [] [2023-01-09 12:31:36,459]  WARN {org.apache.synapse.endpoints.EndpointContext} - Suspending endpoint : NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0 with address http://100.66.213.31:7010/mcm-provider - current suspend duration is : 1800000ms - Next retry after : Mon Jan 09 13:01:36 UTC 2023
TID: [-1234] [] [2023-01-09 12:31:36,460]  WARN {org.apache.synapse.endpoints.LoadbalanceEndpoint} - Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint] Detect a Failure in a child endpoint : Endpoint [NewMCMInboundChannel-RESTAPIService--vv2_APIproductionEndpoint_0]
TID: [-1234] [] [2023-01-09 12:31:36,460]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - {api:admin--NewMCMInboundChannel-RESTAPIService:vv2} STATUS = Executing default 'fault' sequence, ERROR_CODE = 101503, ERROR_MESSAGE = Error connecting to the back end