safekeeper: root-cause WAL sender: failed to open WAL file

[problame]

2024-09-09T16:15:14.448108Z  WARN {cid=987 ttid=$TTID application_name=Some("pageserver")}:WAL sender: failed to open WAL file /storage/safekeeper/data/$TENANT_ID/$TIMELINE_ID/0000000100000802000000D7

Query

Likely a race condition, for example with timeline deletion.

Maybe same condition as #8972

[arssher]

Yes, very likely a race with timeline deletion, it should be made graceful (waiting for walsender shutdown).