- Release Notes and Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- FAQs
- Overview
- Permissions
- Pod Startup Fails Because the Envoy Sidecar Is Unready
- Envoy Status Code 431 "Request Header Fields Too Large" Is Returned
- Envoy Converts Headers to Lowercase
- Headless Service-related FAQs
- Istio-init Crashes
- VirtualService Does Not Take Effect
- Inappropriate VirtualService Route Matching Order
- Failed to Access an Ingress Gateway from the Public Network
- Parsing Fails After Smart DNS Is Enabled
- Locality Load Balancing Does Not Take Effect
- Client Status Code 426 "Upgrade Required" Is Returned
- Sidecars Are Not Automatically Injected
- Circuit Breaking Does Not Take Effect
- 404 Is Returned During Access to a StatefulSet's Pod IP Address
- Service Is Abnormal Due to a Retry Policy
- Incomplete Call Tracing Information
- TCM Policy
- Glossary
- Release Notes and Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- FAQs
- Overview
- Permissions
- Pod Startup Fails Because the Envoy Sidecar Is Unready
- Envoy Status Code 431 "Request Header Fields Too Large" Is Returned
- Envoy Converts Headers to Lowercase
- Headless Service-related FAQs
- Istio-init Crashes
- VirtualService Does Not Take Effect
- Inappropriate VirtualService Route Matching Order
- Failed to Access an Ingress Gateway from the Public Network
- Parsing Fails After Smart DNS Is Enabled
- Locality Load Balancing Does Not Take Effect
- Client Status Code 426 "Upgrade Required" Is Returned
- Sidecars Are Not Automatically Injected
- Circuit Breaking Does Not Take Effect
- 404 Is Returned During Access to a StatefulSet's Pod IP Address
- Service Is Abnormal Due to a Retry Policy
- Incomplete Call Tracing Information
- TCM Policy
- Glossary
http1MaxPendingRequests Not Defined
A DestinationRule is configured with
maxConnections.apiVersion: networking.istio.io/v1beta1kind: DestinationRulemetadata:name: nginxspec:host: nginxtrafficPolicy:connectionPool:tcp:maxConnections: 1
However, the test result shows that when the number of concurrencies exceeds the maximum number of connections defined, circuit breaking is not triggered but the QPS is very low. Usually, this is because the
http1MaxPendingRequests field is not configured. If the field is not configured, the default value 2^32-1 is used, which is very large. This setting indicates that if the maximum number of connections is exceeded, the request will be queued first (503 will not be returned directly). When the number of connections falls below the maximum value, forwarding will continue.If you want circuit breaking to be triggered (503 is returned) when the number of connections reaches the upper limit or exceeds the upper limit for a certain amount, you need to explicitly specify
http1MaxPendingRequests.apiVersion: networking.istio.io/v1beta1kind: DestinationRulemetadata:name: nginxspec:host: nginxtrafficPolicy:connectionPool:tcp:maxConnections: 1http:http1MaxPendingRequests: 1
Yes
No
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