Decouple discovery buffering from endpoint conversion #631
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The discovery layer handles both building a service for each discovered endpoint, as well as a buffer that fails when the service is not polled (i.e. because it has been leaked somehow). This coupling doesn't match other use cases though when, for instance, the client may not be used frequently, as is the case for proxy-to-control-plane communication. This change decouples these layers so that the buffering is decoupled from endpoint-service construction.
This was referenced Aug 20, 2020
hawkw
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Aug 20, 2020
olix0r
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Aug 26, 2020
This release includes internal changes to the service discovery system, especially when discovering control plane components (like the destination and identity controllers). Now, the proxy attempts to balance requests across all pods in each control plane service. This requires control plane changes to use "headless" services so that SRV records are exposed. When the control plane services have a `clusterIP` set, the proxy falls back to using normal A-record lookups. --- * tracing: add richer verbose spans to http clients (linkerd/linkerd2-proxy#622) * trace: update tracing dependencies (linkerd/linkerd2-proxy#623) * Remove `Resolution` trait (linkerd/linkerd2-proxy#606) * Update proxy-identity to edge-20.8.2 (linkerd/linkerd2-proxy#627) * Add build arg for skipping identity wrapper (linkerd/linkerd2-proxy#624) * Wait for proxy thread to terminate in integration tests (linkerd/linkerd2-proxy#625) * Remove scrubbing for unused headers (linkerd/linkerd2-proxy#628) * Split orig-proto tests out of discovery tests (linkerd/linkerd2-proxy#629) * Re-enable outbound timeout test (linkerd/linkerd2-proxy#630) * profiles: perform profile resolution for IP addresses (linkerd/linkerd2-proxy#626) * Move resolve api to async-stream (linkerd/linkerd2-proxy#599) * Decouple discovery buffering from endpoint conversion (linkerd/linkerd2-proxy#631) * resolve: Add a Reset state (linkerd/linkerd2-proxy#633) * resolve: Eagerly fail resolutions (linkerd/linkerd2-proxy#634) * test: replace `net2` dependency with `socket2` (linkerd/linkerd2-proxy#635) * dns: Run DNS resolutions on the main runtime (linkerd/linkerd2-proxy#637) * Load balance requests to the control plane (linkerd/linkerd2-proxy#594) * Unify control plane client construction (linkerd/linkerd2-proxy#638)
olix0r
added a commit
to linkerd/linkerd2
that referenced
this pull request
Aug 26, 2020
This release includes internal changes to the service discovery system, especially when discovering control plane components (like the destination and identity controllers). Now, the proxy attempts to balance requests across all pods in each control plane service. This requires control plane changes to use "headless" services so that SRV records are exposed. When the control plane services have a `clusterIP` set, the proxy falls back to using normal A-record lookups. --- * tracing: add richer verbose spans to http clients (linkerd/linkerd2-proxy#622) * trace: update tracing dependencies (linkerd/linkerd2-proxy#623) * Remove `Resolution` trait (linkerd/linkerd2-proxy#606) * Update proxy-identity to edge-20.8.2 (linkerd/linkerd2-proxy#627) * Add build arg for skipping identity wrapper (linkerd/linkerd2-proxy#624) * Wait for proxy thread to terminate in integration tests (linkerd/linkerd2-proxy#625) * Remove scrubbing for unused headers (linkerd/linkerd2-proxy#628) * Split orig-proto tests out of discovery tests (linkerd/linkerd2-proxy#629) * Re-enable outbound timeout test (linkerd/linkerd2-proxy#630) * profiles: perform profile resolution for IP addresses (linkerd/linkerd2-proxy#626) * Move resolve api to async-stream (linkerd/linkerd2-proxy#599) * Decouple discovery buffering from endpoint conversion (linkerd/linkerd2-proxy#631) * resolve: Add a Reset state (linkerd/linkerd2-proxy#633) * resolve: Eagerly fail resolutions (linkerd/linkerd2-proxy#634) * test: replace `net2` dependency with `socket2` (linkerd/linkerd2-proxy#635) * dns: Run DNS resolutions on the main runtime (linkerd/linkerd2-proxy#637) * Load balance requests to the control plane (linkerd/linkerd2-proxy#594) * Unify control plane client construction (linkerd/linkerd2-proxy#638)
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The discovery layer handles both building a service for each discovered
endpoint, as well as a buffer that fails when the service is not polled
(i.e. because it has been leaked somehow).
This coupling doesn't match other use cases though when, for instance,
the client may not be used frequently, as is the case for
proxy-to-control-plane communication.
This change decouples these layers so that the buffering is decoupled
from endpoint-service construction.