pageserver: only zero truncated FSM page on owning shard #10032
Merged
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Problem
FSM pages are managed like regular relation pages, and owned by a single shard. However, when truncating the FSM relation the last FSM page was zeroed out on all shards. This is unnecessary and potentially confusing.
The superfluous keys will be removed during compactions, as they do not belong on these shards.
Resolves #10027.
Summary of changes
Only zero out the truncated FSM page on the owning shard.