Christian Schwarz dc64962ffc tenant::mgr: explicit tracking of initializing & shutting-down states ...

This patch wrap the tenants hashmap into an enum that represents the
tenant manager's three major states:
- Initializing
- Open for business
- Shutting down.
See the enum doc comments for details.

In response, all the users of `TENANTS` are now forced to distinguish
those states.
The only major change is in `run_if_no_tenant_in_memory`, which,
before this patch, was used by the /attach and /load endpoints.
This patch rewrites that method under the name `tenant_map_insert`,
replacing the anyhow::Result with a std Result and a dedicated error
type.
Introducing this error types allows using `tenant_map_insert` in
`tenant_create`, thereby unifying all code paths that create tenants
objects to use `tenant_map_insert`.

This is beneficial because we can now systematically prevent tenants
from being created, attached, or `/load`ed during pageserver shutdown.
The management API remains available, but the endpoints that create
new tenants will fail with an error.
More work would need to be done to properly distinguish these errors
through HTTP status codes such as 503.

2023-01-26 11:24:48 +01:00

..

benches

Implement layer map using immutable BST (#2998)

2023-01-20 16:10:12 -05:00

fixtures

walredo: simple tests and bench updates (#3045)

2023-01-16 18:24:45 +02:00

src

tenant::mgr: explicit tracking of initializing & shutting-down states

2023-01-26 11:24:48 +01:00

Cargo.toml

Implement layer map using immutable BST (#2998)

2023-01-20 16:10:12 -05:00