To determine when everything was stable, we couldn't just query the nodename since they aren't API visible by design. Instead, we were using a proxy piece of information which was bumping the epoch and waiting for everyone to observe that. This works for making source Node 0 and Node 1 had pinged, and Node 0 and Node 2 had pinged, but did not guarantee that Node 1 and Node 2 had pinged. Although unlikely, this can cause this failure message. To fix it I hijacked hostnames and used its validation that it has been propagated, since we know that it is stable.
I also noticed while stress testing this sometimes the test took almost 4.5 seconds to finish, which is really close to the current 5 second limit of the log check, so I bumped that up as well just to make it a bit more consistent.
This PR adds a human readable name to a node in clusters that are visible as part of error logs. This is useful so that admins and operators of Redis cluster have better visibility into failures without having to cross-reference the generated ID with some logical identifier (such as pod-ID or EC2 instance ID). This is mentioned in #8948. Specific nodenames can be set by using the variable cluster-announce-human-nodename. The nodename is gossiped using the clusterbus extension in #9530.
Co-authored-by: Madelyn Olson <madelyneolson@gmail.com>
This PR introduces a couple of changes to improve cluster test stability:
1. Increase the cluster node timeout to 3 seconds, which is similar to the
normal cluster tests, but introduce a new mechanism to increase the ping
period so that the tests are still fast. This new config is a debug config.
2. Set `cluster-replica-no-failover yes` on a wider array of tests which are
sensitive to failovers. This was occurring on the ARM CI.
Gossip the cluster node blacklist in ping and pong messages.
This means that CLUSTER FORGET doesn't need to be sent to all nodes in a cluster.
It can be sent to one or more nodes and then be propagated to the rest of them.
For each blacklisted node, its node id and its remaining blacklist TTL is gossiped in a
cluster bus ping extension (introduced in #9530).
In the newly added cluster hostnames test, the primary is failing over during the reboot
for valgrind so we are validating the wrong node. This change just sets the replica to
prevent taking over, which seems to fix the test.
We could have also set the timeout higher, but it slows down the test.
