John Spray 85cd97af61 pageserver: add InProgress tenant map state, use a sync lock for the map (#5367) ...

## Problem

Follows on from #5299 
- We didn't have a generic way to protect a tenant undergoing changes:
`Tenant` had states, but for our arbitrary transitions between
secondary/attached, we need a general way to say "reserve this tenant
ID, and don't allow any other ops on it, but don't try and report it as
being in any particular state".
- The TenantsMap structure was behind an async RwLock, but it was never
correct to hold it across await points: that would block any other
changes for all tenants.


## Summary of changes

- Add the `TenantSlot::InProgress` value.  This means:
  - Incoming administrative operations on the tenant should retry later
- Anything trying to read the live state of the tenant (e.g. a page
service reader) should retry later or block.
- Store TenantsMap in `std::sync::RwLock`
- Provide an extended `get_active_tenant_with_timeout` for page_service
to use, which will wait on InProgress slots as well as non-active
tenants.

Closes: https://github.com/neondatabase/neon/issues/5378

---------

Co-authored-by: Christian Schwarz <christian@neon.tech>

2023-11-06 14:03:22 +00:00

..

mod.rs

Remove control_plane deps on pageserver/safekeeper (#2513)

2022-10-04 11:14:45 -07:00

openapi_spec.yml

pageserver: /attach: clarify semantics of 409 (#5698)

2023-10-31 09:32:58 +01:00

routes.rs

pageserver: add InProgress tenant map state, use a sync lock for the map (#5367)

2023-11-06 14:03:22 +00:00