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pageserver: add a /reset API for tenants (#6014)

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## Problem

Traditionally we would detach/attach directly with curl if we wanted to
"reboot" a single tenant. That's kind of inconvenient these days,
because one needs to know a generation number to issue an attach
request.

Closes: https://github.com/neondatabase/neon/issues/6011

## Summary of changes

- Introduce a new `/reset` API, which remembers the LocationConf from
the current attachment so that callers do not have to work out the
correct configuration/generation to use.
- As an additional support tool, allow an optional `drop_cache` query
parameter, for situations where we are concerned that some on-disk state
might be bad and want to clear that as well as the in-memory state.

One might wonder why I didn't call this "reattach" -- it's because
there's already a PS->CP API of that name and it could get confusing.
This commit is contained in:
John Spray
2023-12-05 15:38:27 +00:00
committed by GitHub
parent be885370f6
commit da5e03b0d8
4 changed files with 132 additions and 9 deletions
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23
pageserver/src/http/routes.rs
View File

@@ -709,6 +709,26 @@ async fn tenant_detach_handler(
json_response(StatusCode::OK, ())
}
async fn tenant_reset_handler(
request: Request<Body>,
_cancel: CancellationToken,
) -> Result<Response<Body>, ApiError> {
let tenant_shard_id: TenantShardId = parse_request_param(&request, "tenant_shard_id")?;
check_permission(&request, Some(tenant_shard_id.tenant_id))?;
let drop_cache: Option<bool> = parse_query_param(&request, "drop_cache")?;
let ctx = RequestContext::new(TaskKind::MgmtRequest, DownloadBehavior::Warn);
let state = get_state(&request);
state
.tenant_manager
.reset_tenant(tenant_shard_id, drop_cache.unwrap_or(false), ctx)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, ())
}
async fn tenant_load_handler(
mut request: Request<Body>,
_cancel: CancellationToken,
@@ -1828,6 +1848,9 @@ pub fn make_router(
.post("/v1/tenant/:tenant_id/detach", |r| {
api_handler(r, tenant_detach_handler)
})
.post("/v1/tenant/:tenant_shard_id/reset", |r| {
api_handler(r, tenant_reset_handler)
})
.post("/v1/tenant/:tenant_id/load", |r| {
api_handler(r, tenant_load_handler)
})