This fixes a bug in the other priority plugin that would cause a crash
when retries were attempted when the upstream had no healthy hosts. The
existing check for no healthy was ineffective due to the "everything is
terrible" fallback in the LoadBalancerBase which sets P0 to 100 when all
the priorities are unhealthy.
The fix is to check for healthy % based on the loads computed in the
plugin, not the ones returned by LoadBalancerBase. When all hosts are
unhealthy, we return the original priority load. This ensures that we
maintain whatever fallback the default LB uses when there are no
unhealthy hosts.
Signed-off-by: Snow Pettersen snowp@squareup.com
Risk Level: Medium
Testing: Added regression test for no unhealthy hosts
Docs Changes: n/a
Release Notes: n/a
Signed-off-by: Snow Pettersen <snowp@squareup.com>
Mirrored from https://github.com/envoyproxy/envoy @ 59816a486c64cd05e9e0c0f08194b121690d6632
Implements a RetryPriority which will keep track of attempted
priorities and attempt to route retry requests to other priorities. The
update frequency is configurable, allowing multiple requests to hit each
priority if desired.
As a fallback, when no healthy priorities remain, the list of attempted
priorities will be reset and a host will selected again using the
original priority load.
Extracts out the recalculatePerPriorityState from LoadBalancerBase to
recompute the priority load with the same code used by the LB.
Signed-off-by: Snow Pettersen snowp@squareup.com
Risk Level: Medium, new extension
Testing: unit tests
Docs Changes: n/a
Release Notes: n/a
Signed-off-by: Snow Pettersen <snowp@squareup.com>
Mirrored from https://github.com/envoyproxy/envoy @ ba5d3f0c130bb21958cf093c368af0526a4740b7
data-plane-api(CircleCI)