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concurrency-limit initial logical size calculation [v2] #6000

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merged 6 commits into from
Dec 4, 2023
Merged

concurrency-limit initial logical size calculation [v2] #6000

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ae444c8
rework initial logical size calculation
problame Nov 29, 2023
f886a4c
remove init_order delay for init logical size calculations
problame Nov 30, 2023
08b65dd
remove TODO, turned into follow-up https://github.com/neondatabase/ne…
problame Dec 4, 2023
ac87325
confirm cancellation safety; add a few cancel-safety comments in plac…
problame Dec 4, 2023
4d5bc88
apply review suggestions
problame Dec 4, 2023
5b0e7a7
Merge remote-tracking branch 'origin/main' into problame/init-logical…
problame Dec 4, 2023
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29 changes: 1 addition & 28 deletions pageserver/src/bin/pageserver.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -402,15 +402,11 @@ fn start_pageserver(
let (init_remote_done_tx, init_remote_done_rx) = utils::completion::channel();
let (init_done_tx, init_done_rx) = utils::completion::channel();

let (init_logical_size_done_tx, init_logical_size_done_rx) = utils::completion::channel();

let (background_jobs_can_start, background_jobs_barrier) = utils::completion::channel();

let order = pageserver::InitializationOrder {
initial_tenant_load_remote: Some(init_done_tx),
initial_tenant_load: Some(init_remote_done_tx),
initial_logical_size_can_start: init_done_rx.clone(),
initial_logical_size_attempt: Some(init_logical_size_done_tx),
background_jobs_can_start: background_jobs_barrier.clone(),
};

Expand Down Expand Up @@ -464,34 +460,14 @@ fn start_pageserver(
});

let WaitForPhaseResult {
timeout_remaining: timeout,
timeout_remaining: _timeout,
skipped: init_load_skipped,
} = wait_for_phase("initial_tenant_load", init_load_done, timeout).await;

// initial logical sizes can now start, as they were waiting on init_done_rx.

scopeguard::ScopeGuard::into_inner(guard);

let guard = scopeguard::guard_on_success((), |_| {
tracing::info!("Cancelled before initial logical sizes completed")
});

let logical_sizes_done = std::pin::pin!(async {
init_logical_size_done_rx.wait().await;
startup_checkpoint(
started_startup_at,
"initial_logical_sizes",
"Initial logical sizes completed",
);
});

let WaitForPhaseResult {
timeout_remaining: _,
skipped: logical_sizes_skipped,
} = wait_for_phase("initial_logical_sizes", logical_sizes_done, timeout).await;

scopeguard::ScopeGuard::into_inner(guard);

// allow background jobs to start: we either completed prior stages, or they reached timeout
// and were skipped. It is important that we do not let them block background jobs indefinitely,
// because things like consumption metrics for billing are blocked by this barrier.
Expand All @@ -514,9 +490,6 @@ fn start_pageserver(
if let Some(f) = init_load_skipped {
f.await;
}
if let Some(f) = logical_sizes_skipped {
f.await;
}
scopeguard::ScopeGuard::into_inner(guard);

startup_checkpoint(started_startup_at, "complete", "Startup complete");
Expand Down
7 changes: 6 additions & 1 deletion pageserver/src/consumption_metrics/metrics.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -351,7 +351,12 @@ impl TimelineSnapshot {

let current_exact_logical_size = {
let span = tracing::info_span!("collect_metrics_iteration", tenant_id = %t.tenant_shard_id.tenant_id, timeline_id = %t.timeline_id);
let size = span.in_scope(|| t.get_current_logical_size(ctx));
let size = span.in_scope(|| {
t.get_current_logical_size(
crate::tenant::timeline::GetLogicalSizePriority::Background,
ctx,
)
});
match size {
// Only send timeline logical size when it is fully calculated.
CurrentLogicalSize::Exact(ref size) => Some(size.into()),
Expand Down
3 changes: 2 additions & 1 deletion pageserver/src/http/routes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -338,7 +338,8 @@ async fn build_timeline_info_common(
Lsn(0) => None,
lsn @ Lsn(_) => Some(lsn),
};
let current_logical_size = timeline.get_current_logical_size(ctx);
let current_logical_size =
timeline.get_current_logical_size(tenant::timeline::GetLogicalSizePriority::User, ctx);
let current_physical_size = Some(timeline.layer_size_sum().await);
let state = timeline.current_state();
let remote_consistent_lsn_projected = timeline
Expand Down
7 changes: 0 additions & 7 deletions pageserver/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -186,13 +186,6 @@ pub struct InitializationOrder {
/// Each initial tenant load task carries this until completion.
pub initial_tenant_load: Option<utils::completion::Completion>,

/// Barrier for when we can start initial logical size calculations.
pub initial_logical_size_can_start: utils::completion::Barrier,

/// Each timeline owns a clone of this to be consumed on the initial logical size calculation
/// attempt. It is important to drop this once the attempt has completed.
pub initial_logical_size_attempt: Option<utils::completion::Completion>,

/// Barrier for when we can start any background jobs.
///
/// This can be broken up later on, but right now there is just one class of a background job.
Expand Down
27 changes: 15 additions & 12 deletions pageserver/src/metrics.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -407,16 +407,14 @@ pub(crate) mod initial_logical_size {
use metrics::{register_int_counter, register_int_counter_vec, IntCounter, IntCounterVec};
use once_cell::sync::Lazy;

use crate::task_mgr::TaskKind;

pub(crate) struct StartCalculation(IntCounterVec);
pub(crate) static START_CALCULATION: Lazy<StartCalculation> = Lazy::new(|| {
StartCalculation(
register_int_counter_vec!(
"pageserver_initial_logical_size_start_calculation",
"Incremented each time we start an initial logical size calculation attempt. \
The `task_kind` label is for the task kind that caused this attempt.",
&["attempt", "task_kind"]
The `circumstances` label provides some additional details.",
&["attempt", "circumstances"]
)
.unwrap(),
)
Expand Down Expand Up @@ -464,19 +462,24 @@ pub(crate) mod initial_logical_size {
inc_drop_calculation: Option<IntCounter>,
}

#[derive(strum_macros::IntoStaticStr)]
pub(crate) enum StartCircumstances {
EmptyInitial,
SkippedConcurrencyLimiter,
AfterBackgroundTasksRateLimit,
}

impl StartCalculation {
pub(crate) fn first(&self, causing_task_kind: Option<TaskKind>) -> OngoingCalculationGuard {
let task_kind_label: &'static str =
causing_task_kind.map(|k| k.into()).unwrap_or_default();
self.0.with_label_values(&["first", task_kind_label]);
pub(crate) fn first(&self, circumstances: StartCircumstances) -> OngoingCalculationGuard {
let circumstances_label: &'static str = circumstances.into();
self.0.with_label_values(&["first", circumstances_label]);
OngoingCalculationGuard {
inc_drop_calculation: Some(DROP_CALCULATION.first.clone()),
}
}
pub(crate) fn retry(&self, causing_task_kind: Option<TaskKind>) -> OngoingCalculationGuard {
let task_kind_label: &'static str =
causing_task_kind.map(|k| k.into()).unwrap_or_default();
self.0.with_label_values(&["retry", task_kind_label]);
pub(crate) fn retry(&self, circumstances: StartCircumstances) -> OngoingCalculationGuard {
let circumstances_label: &'static str = circumstances.into();
self.0.with_label_values(&["retry", circumstances_label]);
OngoingCalculationGuard {
inc_drop_calculation: Some(DROP_CALCULATION.retry.clone()),
}
Expand Down
8 changes: 8 additions & 0 deletions pageserver/src/pgdatadir_mapping.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -282,6 +282,10 @@ impl Timeline {
}

/// Get a list of all existing relations in given tablespace and database.
///
/// # Cancel-Safety
///
/// This method is cancellation-safe.
pub async fn list_rels(
&self,
spcnode: Oid,
Expand Down Expand Up @@ -630,6 +634,10 @@ impl Timeline {
///
/// Only relation blocks are counted currently. That excludes metadata,
/// SLRUs, twophase files etc.
///
/// # Cancel-Safety
///
/// This method is cancellation-safe.
pub async fn get_current_logical_size_non_incremental(
&self,
lsn: Lsn,
Expand Down
63 changes: 11 additions & 52 deletions pageserver/src/tenant.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -472,7 +472,6 @@ impl Tenant {
index_part: Option<IndexPart>,
metadata: TimelineMetadata,
ancestor: Option<Arc<Timeline>>,
init_order: Option<&InitializationOrder>,
_ctx: &RequestContext,
) -> anyhow::Result<()> {
let tenant_id = self.tenant_shard_id;
Expand All @@ -482,7 +481,6 @@ impl Tenant {
&metadata,
ancestor.clone(),
resources,
init_order,
CreateTimelineCause::Load,
)?;
let disk_consistent_lsn = timeline.get_disk_consistent_lsn();
Expand Down Expand Up @@ -683,10 +681,6 @@ impl Tenant {
// as we are no longer loading, signal completion by dropping
// the completion while we resume deletion
drop(_completion);
// do not hold to initial_logical_size_attempt as it will prevent loading from proceeding without timeout
let _ = init_order
.as_mut()
.and_then(|x| x.initial_logical_size_attempt.take());
let background_jobs_can_start =
init_order.as_ref().map(|x| &x.background_jobs_can_start);
if let Some(background) = background_jobs_can_start {
Expand All @@ -700,7 +694,6 @@ impl Tenant {
&tenant_clone,
preload,
tenants,
init_order,
&ctx,
)
.await
Expand All @@ -713,7 +706,7 @@ impl Tenant {
}
}

match tenant_clone.attach(init_order, preload, &ctx).await {
match tenant_clone.attach(preload, &ctx).await {
Ok(()) => {
info!("attach finished, activating");
tenant_clone.activate(broker_client, None, &ctx);
Expand Down Expand Up @@ -776,7 +769,6 @@ impl Tenant {
///
async fn attach(
self: &Arc<Tenant>,
init_order: Option<InitializationOrder>,
preload: Option<TenantPreload>,
ctx: &RequestContext,
) -> anyhow::Result<()> {
Expand All @@ -789,7 +781,7 @@ impl Tenant {
None => {
// Deprecated dev mode: load from local disk state instead of remote storage
// https://github.com/neondatabase/neon/issues/5624
return self.load_local(init_order, ctx).await;
return self.load_local(ctx).await;
}
};

Expand Down Expand Up @@ -884,7 +876,6 @@ impl Tenant {
&index_part.metadata,
Some(remote_timeline_client),
self.deletion_queue_client.clone(),
None,
)
.await
.context("resume_deletion")
Expand Down Expand Up @@ -1009,10 +1000,6 @@ impl Tenant {
None
};

// we can load remote timelines during init, but they are assumed to be so rare that
// initialization order is not passed to here.
let init_order = None;

// timeline loading after attach expects to find metadata file for each metadata
save_metadata(
self.conf,
Expand All @@ -1030,7 +1017,6 @@ impl Tenant {
Some(index_part),
remote_metadata,
ancestor,
init_order,
ctx,
)
.await
Expand Down Expand Up @@ -1272,11 +1258,7 @@ impl Tenant {
/// files on disk. Used at pageserver startup.
///
/// No background tasks are started as part of this routine.
async fn load_local(
self: &Arc<Tenant>,
init_order: Option<InitializationOrder>,
ctx: &RequestContext,
) -> anyhow::Result<()> {
async fn load_local(self: &Arc<Tenant>, ctx: &RequestContext) -> anyhow::Result<()> {
span::debug_assert_current_span_has_tenant_id();

debug!("loading tenant task");
Expand All @@ -1302,7 +1284,7 @@ impl Tenant {
// Process loadable timelines first
for (timeline_id, local_metadata) in scan.sorted_timelines_to_load {
if let Err(e) = self
.load_local_timeline(timeline_id, local_metadata, init_order.as_ref(), ctx, false)
.load_local_timeline(timeline_id, local_metadata, ctx, false)
.await
{
match e {
Expand Down Expand Up @@ -1336,13 +1318,7 @@ impl Tenant {
}
Some(local_metadata) => {
if let Err(e) = self
.load_local_timeline(
timeline_id,
local_metadata,
init_order.as_ref(),
ctx,
true,
)
.load_local_timeline(timeline_id, local_metadata, ctx, true)
.await
{
match e {
Expand Down Expand Up @@ -1370,12 +1346,11 @@ impl Tenant {
/// Subroutine of `load_tenant`, to load an individual timeline
///
/// NB: The parent is assumed to be already loaded!
#[instrument(skip(self, local_metadata, init_order, ctx))]
#[instrument(skip(self, local_metadata, ctx))]
async fn load_local_timeline(
self: &Arc<Self>,
timeline_id: TimelineId,
local_metadata: TimelineMetadata,
init_order: Option<&InitializationOrder>,
ctx: &RequestContext,
found_delete_mark: bool,
) -> Result<(), LoadLocalTimelineError> {
Expand All @@ -1392,7 +1367,6 @@ impl Tenant {
&local_metadata,
None,
self.deletion_queue_client.clone(),
init_order,
)
.await
.context("resume deletion")
Expand All @@ -1409,17 +1383,9 @@ impl Tenant {
None
};

self.timeline_init_and_sync(
timeline_id,
resources,
None,
local_metadata,
ancestor,
init_order,
ctx,
)
.await
.map_err(LoadLocalTimelineError::Load)
self.timeline_init_and_sync(timeline_id, resources, None, local_metadata, ancestor, ctx)
.await
.map_err(LoadLocalTimelineError::Load)
}

pub(crate) fn tenant_id(&self) -> TenantId {
Expand Down Expand Up @@ -2314,7 +2280,6 @@ impl Tenant {
new_metadata: &TimelineMetadata,
ancestor: Option<Arc<Timeline>>,
resources: TimelineResources,
init_order: Option<&InitializationOrder>,
cause: CreateTimelineCause,
) -> anyhow::Result<Arc<Timeline>> {
let state = match cause {
Expand All @@ -2329,9 +2294,6 @@ impl Tenant {
CreateTimelineCause::Delete => TimelineState::Stopping,
};

let initial_logical_size_can_start = init_order.map(|x| &x.initial_logical_size_can_start);
let initial_logical_size_attempt = init_order.map(|x| &x.initial_logical_size_attempt);

let pg_version = new_metadata.pg_version();

let timeline = Timeline::new(
Expand All @@ -2345,8 +2307,6 @@ impl Tenant {
Arc::clone(&self.walredo_mgr),
resources,
pg_version,
initial_logical_size_can_start.cloned(),
initial_logical_size_attempt.cloned().flatten(),
state,
self.cancel.child_token(),
);
Expand Down Expand Up @@ -3168,7 +3128,6 @@ impl Tenant {
new_metadata,
ancestor,
resources,
None,
CreateTimelineCause::Load,
)
.context("Failed to create timeline data structure")?;
Expand Down Expand Up @@ -3843,7 +3802,7 @@ pub(crate) mod harness {
match mode {
LoadMode::Local => {
tenant
.load_local(None, ctx)
.load_local(ctx)
.instrument(info_span!("try_load", tenant_id=%self.tenant_shard_id.tenant_id, shard_id=%self.tenant_shard_id.shard_slug()))
.await?;
}
Expand All @@ -3853,7 +3812,7 @@ pub(crate) mod harness {
.instrument(info_span!("try_load_preload", tenant_id=%self.tenant_shard_id.tenant_id, shard_id=%self.tenant_shard_id.shard_slug()))
.await?;
tenant
.attach(None, Some(preload), ctx)
.attach(Some(preload), ctx)
.instrument(info_span!("try_load", tenant_id=%self.tenant_shard_id.tenant_id, shard_id=%self.tenant_shard_id.shard_slug()))
.await?;
}
Expand Down
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