cluster.check asks every master to ping every volume server, but the
Ping gate validated volume-server targets only against the local
topology. Only the leader receives volume-server heartbeats, so a
follower's topology is empty and every probe through it failed with
"unknown ping target ... of type volumeServer".
Fall back to the volume-server set the master learns over its own
MasterClient subscription to the leader, the same source the filer gate
already trusts. The anti-SSRF intent is preserved: Ping still only dials
recognized cluster members.
Chris LuandGitHub
9021225591