mirror of
https://github.com/neondatabase/neon.git
synced 2026-05-21 07:00:38 +00:00
a72af29d12
## Problem The API for detaching things wasn't implement yet, but one could hit this case indirectly from tests when using attach-hook, and find tenants unexpectedly attached again because their policy remained Single. ## Summary of changes Add PlacementPolicy::Detached, and: - add the behavior for it in schedule() - in tenant_migrate, refuse if the policy is detached - automatically set this policy in attach-hook if the caller has specified pageserver=null.
60 lines
1.2 KiB
Rust
60 lines
1.2 KiB
Rust
use serde::{Deserialize, Serialize};
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use utils::seqwait::MonotonicCounter;
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mod compute_hook;
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pub mod http;
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mod node;
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pub mod persistence;
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mod reconciler;
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mod scheduler;
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pub mod service;
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mod tenant_state;
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#[derive(Clone, Serialize, Deserialize)]
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enum PlacementPolicy {
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/// Cheapest way to attach a tenant: just one pageserver, no secondary
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Single,
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/// Production-ready way to attach a tenant: one attached pageserver and
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/// some number of secondaries.
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Double(usize),
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/// Do not attach to any pageservers
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Detached,
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}
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#[derive(Ord, PartialOrd, Eq, PartialEq, Copy, Clone)]
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struct Sequence(u64);
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impl Sequence {
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fn initial() -> Self {
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Self(0)
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}
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}
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impl std::fmt::Display for Sequence {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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write!(f, "{}", self.0)
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}
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}
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impl MonotonicCounter<Sequence> for Sequence {
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fn cnt_advance(&mut self, v: Sequence) {
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assert!(*self <= v);
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*self = v;
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}
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fn cnt_value(&self) -> Sequence {
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*self
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}
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}
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impl Sequence {
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fn next(&self) -> Sequence {
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Sequence(self.0 + 1)
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}
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}
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impl Default for PlacementPolicy {
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fn default() -> Self {
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PlacementPolicy::Double(1)
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}
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}
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