a01936442c
This continues the work done in #14908 where a crude solution to prevent a goroutine leak was implemented. The former code would launch a perpetual goroutine family every iteration (+1 +1) and the fixed code simply caused a new goroutine family to first cancel the prior one to prevent the leak (-1 +1 == 0). This PR refactors this code completely to: - make it more understandable - remove the recursion-via-goroutine strangeness - prevent unnecessary RPC fetches when the prior one has errored. The core issue arose from a conflation of the entry.Fetching field to mean: - there is an RPC (blocking query) in flight right now - there is a goroutine running to manage the RPC fetch retry loop The problem is that the goroutine-leak-avoidance check would treat Fetching like (2), but within the body of a goroutine it would flip that boolean back to false before the retry sleep. This would cause a new chain of goroutines to launch which #14908 would correct crudely. The refactored code uses a plain for-loop and changes the semantics to track state for "is there a goroutine associated with this cache entry" instead of the former. We use a uint64 unique identity per goroutine instead of a boolean so that any orphaned goroutines can tell when they've been replaced when the expiry loop deletes a cache entry while the goroutine is still running and is later replaced. |
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README.md
Consul
Consul is a distributed, highly available, and data center aware solution to connect and configure applications across dynamic, distributed infrastructure.
- Website: https://www.consul.io
- Tutorials: HashiCorp Learn
- Forum: Discuss
Consul provides several key features:
-
Multi-Datacenter - Consul is built to be datacenter aware, and can support any number of regions without complex configuration.
-
Service Mesh - Consul Service Mesh enables secure service-to-service communication with automatic TLS encryption and identity-based authorization. Applications can use sidecar proxies in a service mesh configuration to establish TLS connections for inbound and outbound connections with Transparent Proxy.
-
Service Discovery - Consul makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface. External services such as SaaS providers can be registered as well.
-
Health Checking - Health Checking enables Consul to quickly alert operators about any issues in a cluster. The integration with service discovery prevents routing traffic to unhealthy hosts and enables service level circuit breakers.
-
Key/Value Storage - A flexible key/value store enables storing dynamic configuration, feature flagging, coordination, leader election and more. The simple HTTP API makes it easy to use anywhere.
Consul runs on Linux, macOS, FreeBSD, Solaris, and Windows and includes an optional browser based UI. A commercial version called Consul Enterprise is also available.
Please note: We take Consul's security and our users' trust very seriously. If you believe you have found a security issue in Consul, please responsibly disclose by contacting us at security@hashicorp.com.
Quick Start
A few quick start guides are available on the Consul website:
- Standalone binary install: https://learn.hashicorp.com/collections/consul/get-started-vms
- Minikube install: https://learn.hashicorp.com/tutorials/consul/kubernetes-minikube
- Kind install: https://learn.hashicorp.com/tutorials/consul/kubernetes-kind
- Kubernetes install: https://learn.hashicorp.com/tutorials/consul/kubernetes-deployment-guide
- Deploy HCP Consul: https://learn.hashicorp.com/tutorials/consul/hcp-gs-deploy
Documentation
Full, comprehensive documentation is available on the Consul website: https://consul.io/docs
Contributing
Thank you for your interest in contributing! Please refer to CONTRIBUTING.md for guidance. For contributions specifically to the browser based UI, please refer to the UI's README.md for guidance.