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neon/pageserver
Heikki Linnakangas 2d6a022bb8 Don't allow two timeline_delete operations to run concurrently. (#4313)
If the timeline is already being deleted, return an error. We used to
notice the duplicate request and error out in
persist_index_part_with_deleted_flag(), but it's better to detect it
earlier. Add an explicit lock for the deletion.

Note: This doesn't do anything about the async cancellation problem
(github issue #3478): if the original HTTP request dropped, because the
client disconnected, the timeline deletion stops half-way through the
operation. That needs to be fixed, too, but that's a separate story.

(This is a simpler replacement for PR #4194. I'm also working on the
cancellation shielding, see PR #4314.)
2023-05-27 15:55:43 +03:00
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