Redis cluster never removes hosts that are PENDING_DYNAMIC_REMOVAL
#14,630 opened on 2021年1月11日
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説明
Description: When a host is removed from a Redis cluster, and health checks are enabled, then the host will remain in PENDING_DYNAMIC_REMOVAL even after it fails health checks.
A test for this bug can be found (commented out) in this commit: https://github.com/envoyproxy/envoy/pull/14483/commits/cc8729f9bcd219bc8f016f21d90f086e63e02b39
It seems likely that this is also true of the strict DNS cluster type too.
Repro steps: Create a Redis cluster with health checks enabled. Remove a host from the cluster in a way that causes the health check to still pass. Check that the host has moved to pending dynamic removal. Fail the health check.
Expected result: The host is removed from the cluster.
Actual result: The host remains in pending dynamic removal state.