liaoxin01 commented on code in PR #68991:
URL: https://github.com/apache/doris/pull/68991#discussion_r4313555226
##########
be/src/io/cache/block_file_cache.cpp:
##########
@@ -2106,25 +2172,225 @@ std::string
BlockFileCache::dump_single_cache_type_unlocked(const UInt128Wrapper
return cache_type_to_string(cell->second.file_block->cache_type());
}
-void BlockFileCache::change_cache_type(const UInt128Wrapper& hash, size_t
offset,
- FileCacheType new_type,
- std::lock_guard<std::mutex>&
cache_lock) {
- if (auto iter = _files.find(hash); iter != _files.end()) {
- auto& file_blocks = iter->second;
- if (auto cell_it = file_blocks.find(offset); cell_it !=
file_blocks.end()) {
- FileBlockCell& cell = cell_it->second;
- auto& cur_queue = get_queue(cell.file_block->cache_type());
- DCHECK(cell.queue_iterator.has_value());
- cur_queue.remove(*cell.queue_iterator, cache_lock);
- _lru_recorder->record_queue_event(
- cell.file_block->cache_type(), CacheLRULogType::REMOVE,
- cell.file_block->get_hash_value(),
cell.file_block->offset(), cell.size());
- auto& new_queue = get_queue(new_type);
- cell.queue_iterator =
- new_queue.add(hash, offset,
cell.file_block->range().size(), cache_lock);
- _lru_recorder->record_queue_event(new_type, CacheLRULogType::ADD,
-
cell.file_block->get_hash_value(),
- cell.file_block->offset(),
cell.size());
+bool BlockFileCache::is_protected(const FileBlock& block, int64_t now) {
+ return is_protected(block.tablet_id(),
static_cast<int64_t>(block.expiration_time()), now);
+}
+
+bool BlockFileCache::is_protected(int64_t tablet_id, int64_t legacy_deadline,
int64_t now) {
+ bool legacy = false;
+ const int64_t deadline = _policy_registry->protected_until(tablet_id,
legacy_deadline, &legacy);
+ if (deadline <= now) {
+ return false;
+ }
+ if (legacy) {
+ int64_t next = _next_legacy_deadline.load(std::memory_order_relaxed);
+ while (deadline < next && !_next_legacy_deadline.compare_exchange_weak(
+ next, deadline,
std::memory_order_relaxed)) {
+ }
+ }
+ return true;
+}
+
+FileCacheType BlockFileCache::queue_type_for(int64_t tablet_id, int64_t
legacy_deadline,
+ FileCacheType cache_class,
int64_t now) {
+ DCHECK(cache_class != FileCacheType::TTL);
+ return is_protected(tablet_id, legacy_deadline, now) ? FileCacheType::TTL
: cache_class;
+}
+
+void BlockFileCache::move_cell_to_queue(FileBlockCell& cell, FileCacheType
new_type,
+ std::lock_guard<std::mutex>&
cache_lock) {
+ auto& file_block = *cell.file_block;
+ const FileCacheType old_type = file_block.cache_type();
+ DCHECK(old_type != new_type);
+ DCHECK(cell.queue_iterator.has_value());
+ get_queue(old_type).remove(*cell.queue_iterator, cache_lock);
+ _lru_recorder->record_queue_event(old_type, CacheLRULogType::REMOVE,
+ file_block.get_hash_value(),
file_block.offset(),
+ cell.size());
+ cell.queue_iterator = get_queue(new_type).add_front(
+ file_block.get_hash_value(), file_block.offset(), cell.size(),
cache_lock);
+ _lru_recorder->record_queue_event(new_type, CacheLRULogType::ADDTOFRONT,
+ file_block.get_hash_value(),
file_block.offset(),
+ cell.size());
+ file_block._key.meta.type = new_type;
+ *_ttl_relocated_blocks << 1;
+}
+
+void BlockFileCache::add_cached_tablet(int64_t tablet_id) {
+ if (tablet_id > 0) {
+ ++_cached_tablets[tablet_id];
+ }
+}
+
+void BlockFileCache::remove_cached_tablet(int64_t tablet_id) {
+ if (tablet_id > 0) {
+ auto it = _cached_tablets.find(tablet_id);
+ DCHECK(it != _cached_tablets.end());
+ if (--it->second == 0) {
+ _cached_tablets.erase(it);
+ }
+ }
+}
+
+void BlockFileCache::relocate_to_ttl_queue(const std::vector<FileBlockCell*>&
cells,
+ std::lock_guard<std::mutex>&
cache_lock) {
+ for (auto* cell : cells) {
+ move_cell_to_queue(*cell, FileCacheType::TTL, cache_lock);
+ }
+}
+
+void BlockFileCache::complete_loaded_cell(FileBlockCell& cell, int64_t
tablet_id,
+ FileCacheType cache_class, uint64_t
legacy_deadline,
+ std::lock_guard<std::mutex>&
cache_lock) {
+ auto& meta = cell.file_block->_key.meta;
+ remove_cached_tablet(meta.tablet_id);
+ add_cached_tablet(tablet_id);
+ meta.tablet_id = tablet_id;
+ meta.cache_class = cache_class_of(cache_class);
+ meta.expiration_time = legacy_deadline;
+ const FileCacheType queue_type = queue_type_for(
+ tablet_id, static_cast<int64_t>(legacy_deadline),
meta.cache_class, UnixSeconds());
+ if (queue_type != meta.type) {
+ move_cell_to_queue(cell, queue_type, cache_lock);
+ }
+}
+
+void BlockFileCache::start_queue_sweeps(int64_t now) {
+ auto& state = _queue_sweep;
+ auto is_active = [&](FileCacheType type) { return
state.active[file_cache_type_index(type)]; };
+ const bool backstop_due =
+ now - state.last_backstop_at >=
config::file_cache_queue_sweep_backstop_interval_s;
+ // A pass over the TTL queue picks up blocks whose tablet lost its TTL, or
whose deadline
+ // passed, since the previous pass started. A pass under way is never
restarted; what
+ // changes meanwhile starts the next one.
+ if (!is_active(FileCacheType::TTL)) {
+ const uint64_t lost_version =
_policy_registry->protection_lost_version();
+ if (backstop_due || lost_version != state.ttl_pass_lost_version ||
+ _policy_registry->has_deadline_in(state.ttl_pass_started_at, now)
||
+ _next_legacy_deadline.load(std::memory_order_relaxed) <= now) {
+ state.active[file_cache_type_index(FileCacheType::TTL)] = true;
+ // What the next pass is compared with.
+ state.ttl_pass_lost_version = lost_version;
+ state.ttl_pass_started_at = now;
+ state.ttl_pass_legacy_bytes = 0;
+ // The pass finds again those still ahead.
+ _next_legacy_deadline.store(std::numeric_limits<int64_t>::max(),
+ std::memory_order_relaxed);
+ }
+ }
+ // A pass over the class queues picks up blocks whose tablet gained a TTL.
The three queues
+ // start together so that the version they record holds for all of them.
+ constexpr std::array<FileCacheType, 3> class_types {FileCacheType::INDEX,
FileCacheType::NORMAL,
+
FileCacheType::DISPOSABLE};
+ if (std::none_of(class_types.begin(), class_types.end(), is_active)) {
+ const uint64_t gained_version =
_policy_registry->protection_gained_version();
+ if (backstop_due || gained_version != state.class_pass_gained_version)
{
+ for (auto type : class_types) {
+ state.active[file_cache_type_index(type)] = true;
+ }
+ state.class_pass_gained_version = gained_version;
+ }
+ }
+ // The backstop counts as done once every queue has a pass; a queue still
busy with an older
+ // pass gets its own when that one ends.
+ if (backstop_due &&
+ std::all_of(state.active.begin(), state.active.end(), [](bool active)
{ return active; })) {
+ state.last_backstop_at = now;
+ }
+}
+
+size_t BlockFileCache::sweep_queue(FileCacheType type, size_t budget, int64_t
now,
+ std::lock_guard<std::mutex>& cache_lock) {
+ auto& active = _queue_sweep.active[file_cache_type_index(type)];
+ if (!active) {
+ return 0;
+ }
+ auto& queue = get_queue(type);
+ auto& pass_left = _queue_sweep.pass_left[file_cache_type_index(type)];
+ if (!queue.sweep_cursor.has_value()) {
+ // A pass walks at most as many blocks as the queue holds when it
starts: blocks touched
+ // or added meanwhile go to the hot end, and must not keep the pass
from ending. A block
+ // touched before the cursor reached it may be left for the next pass.
+ queue.sweep_cursor = queue.begin();
+ pass_left = queue.queue.size();
+ }
+ // The cursor lives on the queue, so the pass resumes there after the
cache lock was released.
+ auto& cursor = *queue.sweep_cursor;
+ size_t walked = 0;
+ std::vector<std::pair<FileBlockCell*, FileCacheType>> moves;
+ for (; walked < budget && pass_left > 0 && cursor != queue.end();
++walked, --pass_left) {
+ auto& entry = *cursor;
+ // Past the entry before it may move.
+ ++cursor;
+ auto* cell = get_cell(entry.hash, entry.offset, cache_lock);
+ DCHECK(cell != nullptr);
+ const auto& block = *cell->file_block;
+ // Where the block belongs now: the TTL queue while protected, else
its class queue.
+ const FileCacheType want =
+ is_protected(block, now) ? FileCacheType::TTL :
block.cache_class();
+ if (want != type) {
+ moves.emplace_back(cell, want);
+ } else if (type == FileCacheType::TTL && block.tablet_id() <= 0) {
+ _queue_sweep.ttl_pass_legacy_bytes += cell->size();
+ }
+ }
+ // Moved after the walk, all of them behind the cursor.
+ for (auto& [cell, want] : moves) {
+ move_cell_to_queue(*cell, want, cache_lock);
+ }
+ // The pass is over; start_queue_sweeps() decides whether another one is
due.
+ if (pass_left == 0 || queue.sweep_cursor == queue.end()) {
+ queue.sweep_cursor.reset();
+ active = false;
+ if (type == FileCacheType::TTL) {
+
_ttl_legacy_v2_protected_bytes->set_value(_queue_sweep.ttl_pass_legacy_bytes);
+ }
+ }
+ return walked;
+}
+
+// How often a cache path tells the policy registry which tablets it holds
blocks of.
+constexpr int64_t kReportCachedTabletsIntervalS = 60;
+
+void BlockFileCache::run_background_queue_sweep() {
+ Thread::set_self_name("run_background_queue_sweep");
+ while (!_close) {
+ {
+ std::unique_lock close_lock(_close_mtx);
+ _close_cv.wait_for(close_lock, std::chrono::milliseconds(
+
config::file_cache_queue_sweep_interval_ms));
+ if (_close) {
+ break;
+ }
+ }
+ // Blocks being loaded are put in the right queue as they are loaded.
+ if (!_async_open_done) {
Review Comment:
Fixed in 82f233f9f0a: the startup reservation now skips protected blocks and
moves them to the TTL queue, like eviction after loading, within the same skip
and relocation bounds.
##########
be/src/io/cache/tablet_cache_policy_registry.cpp:
##########
@@ -0,0 +1,448 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include "io/cache/tablet_cache_policy_registry.h"
+
+#include <bvar/bvar.h>
+
+#include <algorithm>
+#include <chrono>
+#include <limits>
+
+#include "common/config.h"
+#include "common/logging.h"
+#include "cpp/sync_point.h"
+#include "io/cache/cache_block_meta_store.h"
+#include "runtime/exec_env.h"
+#include "storage/tablet/tablet_meta.h"
+#include "util/thread.h"
+#include "util/time.h"
+
+namespace doris::io {
+
+bvar::Adder<uint64_t>
g_tablet_cache_policy_fetch_num("file_cache_tablet_policy_fetch_num");
+bvar::Adder<uint64_t> g_tablet_cache_policy_fetch_failed_num(
+ "file_cache_tablet_policy_fetch_failed_num");
+bvar::PassiveStatus<size_t> g_tablet_cache_policy_num(
+ "file_cache_tablet_policy_num",
+ [](void*) { return TabletCachePolicyRegistry::instance()->size(); },
nullptr);
+
+namespace {
+
+// How often the record is scanned for policies nobody needs any more.
+constexpr int64_t kPruneIntervalS = 60;
+// How long a tablet whose policy could not be fetched is left alone.
+constexpr int64_t kFetchRetryIntervalS = 60;
+// How many reported tablets are looked up per hold of the exclusive lock.
+constexpr size_t kReportBatchSize = 1024;
+// How often the background refresh runs.
+constexpr std::chrono::seconds kRefreshInterval {1};
+
+Status fetch_from_tablet_meta(int64_t tablet_id, TabletCachePolicy* policy) {
+ TabletMetaSharedPtr tablet_meta;
+ RETURN_IF_ERROR(ExecEnv::get_tablet_meta(tablet_id, &tablet_meta, false));
+ DORIS_CHECK(tablet_meta != nullptr);
+ policy->ttl_seconds = tablet_meta->ttl_seconds();
+ policy->ctime = tablet_meta->creation_time();
+ return Status::OK();
+}
+
+} // namespace
+
+int64_t TabletCachePolicy::deadline() const {
+ if (ttl_seconds <= 0 || ctime <= 0) {
+ return 0;
+ }
+ // Same rule as TabletMeta::file_cache_ttl_expiration_time(): a huge ttl
must not wrap into
+ // a deadline in the past.
+ if (ctime > std::numeric_limits<int64_t>::max() - ttl_seconds) {
+ return std::numeric_limits<int64_t>::max();
+ }
+ return ctime + ttl_seconds;
+}
+
+TabletCachePolicyRegistry* TabletCachePolicyRegistry::instance() {
+ // Never destroyed: a cache path may still be running when the process
exits.
+ static auto* registry = new TabletCachePolicyRegistry();
+ return registry;
+}
+
+std::optional<int64_t> TabletCachePolicyRegistry::deadline(int64_t tablet_id)
const {
+ std::shared_lock lock(_mutex);
+ auto it = _entries.find(tablet_id);
+ if (it == _entries.end()) {
+ return std::nullopt;
+ }
+ return it->second.policy.deadline();
+}
+
+int64_t TabletCachePolicyRegistry::protected_until(int64_t tablet_id, int64_t
legacy_deadline,
+ bool* legacy) {
+ // tablet_id 0 is data outside any Doris tablet (external tables, v2 cache
files that never
+ // recorded one): it only has the deadline it was written with.
+ if (tablet_id > 0) {
+ if (const std::optional<int64_t> known = deadline(tablet_id);
known.has_value()) {
+ *legacy = false;
+ return *known;
+ }
+ note_tablet(tablet_id);
+ }
+ *legacy = true;
+ return legacy_deadline;
+}
+
+bool TabletCachePolicyRegistry::is_protected(int64_t tablet_id, int64_t
legacy_deadline,
+ int64_t now) {
+ bool legacy = false;
+ return protected_until(tablet_id, legacy_deadline, &legacy) > now;
+}
+
+std::optional<TabletCachePolicy> TabletCachePolicyRegistry::set_locked(
+ int64_t tablet_id, const TabletCachePolicy& policy, int64_t
refreshed_at_s) {
+ auto [it, inserted] =
+ _entries.try_emplace(tablet_id, Entry {policy, refreshed_at_s,
refreshed_at_s});
+ std::optional<TabletCachePolicy> before;
+ if (!inserted) {
+ before = it->second.policy;
+ if (const int64_t old_deadline = before->deadline(); old_deadline > 0)
{
+ _deadlines.erase(_deadlines.find(old_deadline));
+ }
+ it->second.policy = policy;
+ it->second.refreshed_at_s = refreshed_at_s;
+ }
+ if (const int64_t new_deadline = policy.deadline(); new_deadline > 0) {
+ _deadlines.insert(new_deadline);
+ }
+ return before;
+}
+
+std::optional<TabletCachePolicy>
TabletCachePolicyRegistry::erase_locked(int64_t tablet_id) {
+ auto it = _entries.find(tablet_id);
+ if (it == _entries.end()) {
+ return std::nullopt;
+ }
+ const TabletCachePolicy before = it->second.policy;
+ if (const int64_t old_deadline = before.deadline(); old_deadline > 0) {
+ _deadlines.erase(_deadlines.find(old_deadline));
+ }
+ _entries.erase(it);
+ return before;
+}
+
+void TabletCachePolicyRegistry::bump_versions(const
std::optional<TabletCachePolicy>& before,
+ const
std::optional<TabletCachePolicy>& after) {
+ auto bump = [](std::atomic<uint64_t>& version) {
+ version.fetch_add(1, std::memory_order_acq_rel);
+ };
+ // An unknown tablet is judged by the deadline each block carries, which
may be earlier or
+ // later, so learning or forgetting a tablet can move its blocks either
way.
+ if (!before.has_value() || !after.has_value()) {
+ bump(_protection_gained_version);
+ bump(_protection_lost_version);
+ return;
+ }
+ // A block is protected while the deadline is ahead, so only a change of
that at this moment
+ // moves blocks now: a TTL rewritten from one deadline ahead to another
moves none, and the
+ // new deadline starts a pass over the TTL queue when it passes
(has_deadline_in()).
+ const int64_t now = UnixSeconds();
+ const int64_t old_deadline = before->deadline();
+ const int64_t new_deadline = after->deadline();
+ if (old_deadline <= now && new_deadline > now) {
+ bump(_protection_gained_version);
+ }
+ // Also when both have passed: the pass the old deadline was to start may
not have run yet.
+ if (new_deadline < old_deadline && new_deadline <= now) {
+ bump(_protection_lost_version);
+ }
+}
+
+void TabletCachePolicyRegistry::persist(int64_t tablet_id,
+ const
std::optional<TabletCachePolicy>& policy) {
+ std::lock_guard lock(_stores_mutex);
+ for (auto* store : _stores) {
+ if (policy.has_value()) {
+ store->put_tablet_policy(tablet_id, *policy);
+ } else {
+ store->delete_tablet_policy(tablet_id);
+ }
+ }
+}
+
+void TabletCachePolicyRegistry::upsert(int64_t tablet_id, const
TabletCachePolicy& policy) {
+ DORIS_CHECK(tablet_id > 0);
+ const int64_t now = UnixSeconds();
+ {
+ // Unchanged and recently confirmed is the common case: every meta
refresh reports the
+ // policy. Only take the exclusive lock to record a change, or to push
the refresh time
+ // forward once it is half way to being due.
+ std::shared_lock lock(_mutex);
+ auto it = _entries.find(tablet_id);
+ if (it != _entries.end() && it->second.policy == policy &&
+ it->second.refreshed_at_s >
+ now - config::file_cache_tablet_policy_refresh_interval_s
/ 2) {
+ return;
+ }
+ }
+ std::optional<TabletCachePolicy> before;
+ {
+ std::unique_lock lock(_mutex);
+ before = set_locked(tablet_id, policy, now);
+ }
+ if (before == policy) {
+ return;
+ }
+ bump_versions(before, policy);
+ persist(tablet_id, policy);
+}
+
+void TabletCachePolicyRegistry::erase(int64_t tablet_id) {
+ std::optional<TabletCachePolicy> before;
+ {
+ std::unique_lock lock(_mutex);
+ before = erase_locked(tablet_id);
+ }
+ if (!before.has_value()) {
+ return;
+ }
+ bump_versions(before, std::nullopt);
+ persist(tablet_id, std::nullopt);
+}
+
+void TabletCachePolicyRegistry::restore(int64_t tablet_id, const
TabletCachePolicy& policy) {
+ std::optional<TabletCachePolicy> before;
+ {
+ std::unique_lock lock(_mutex);
+ if (_entries.contains(tablet_id)) {
+ // Already known from the live meta or from another cache path's
copy.
+ return;
+ }
+ // Never refreshed by this process, so it is due as soon as a cache
path reports it;
+ // counted as reported now so that it is not forgotten before the
cache has loaded.
+ before = set_locked(tablet_id, policy, 0);
+ _entries[tablet_id].reported_at_s = UnixSeconds();
+ }
+ bump_versions(before, policy);
+}
+
+void TabletCachePolicyRegistry::note_tablet(int64_t tablet_id) {
+ std::lock_guard pending_lock(_pending_mutex);
+ _noted.insert(tablet_id);
+}
+
+bool TabletCachePolicyRegistry::has_deadline_in(int64_t from, int64_t to)
const {
+ std::shared_lock lock(_mutex);
+ auto it = _deadlines.upper_bound(from);
+ return it != _deadlines.end() && *it <= to;
+}
+
+void TabletCachePolicyRegistry::report_cached_tablets(const
std::vector<int64_t>& tablet_ids) {
+ const int64_t now = UnixSeconds();
+ const int64_t stale_before = now -
config::file_cache_tablet_policy_refresh_interval_s;
+ std::vector<int64_t> due;
+ // In batches: a path may hold blocks of many tablets, and the readers
waiting on this lock
+ // hold their cache lock.
+ for (size_t begin = 0; begin < tablet_ids.size(); begin +=
kReportBatchSize) {
+ const size_t end = std::min(tablet_ids.size(), begin +
kReportBatchSize);
+ std::unique_lock lock(_mutex);
+ for (size_t i = begin; i < end; ++i) {
+ const int64_t tablet_id = tablet_ids[i];
+ auto it = _entries.find(tablet_id);
+ if (it == _entries.end()) {
+ due.push_back(tablet_id);
+ continue;
+ }
+ it->second.reported_at_s = now;
+ if (it->second.refreshed_at_s <= stale_before) {
+ due.push_back(tablet_id);
+ }
+ }
+ }
+ std::lock_guard pending_lock(_pending_mutex);
+ _due.insert(due.begin(), due.end());
+}
+
+std::vector<int64_t> TabletCachePolicyRegistry::take_due(int64_t now, size_t
budget) {
+ std::unordered_set<int64_t> noted;
+ {
+ std::lock_guard pending_lock(_pending_mutex);
+ noted.swap(_noted);
+ }
+ // A noted tablet may have been learned since.
+ std::erase_if(noted, [this](int64_t tablet_id) { return
deadline(tablet_id).has_value(); });
+ std::lock_guard pending_lock(_pending_mutex);
+ _due.insert(noted.begin(), noted.end());
+ std::vector<int64_t> batch;
+ for (auto it = _due.begin(); it != _due.end() && batch.size() < budget; it
= _due.erase(it)) {
+ auto retry = _retry_at.find(*it);
+ if (retry == _retry_at.end() || retry->second <= now) {
+ batch.push_back(*it);
+ }
+ }
+ return batch;
+}
+
+void TabletCachePolicyRegistry::prune(int64_t now) {
+ if (now < _next_prune_s) {
+ return;
+ }
+ _next_prune_s = now + kPruneIntervalS;
+ std::erase_if(_retry_at, [now](const auto& retry) { return retry.second <=
now; });
+ // A tablet no cache path holds and nothing refreshes (unloaded, or
dropped) has no blocks
+ // to judge; it is learned again if its blocks come back.
+ const int64_t forget_before = now - 2 *
config::file_cache_tablet_policy_refresh_interval_s;
Review Comment:
Fixed in a3d3e35279e: cache paths report their tablets while loading too,
and a policy is kept for at least five minutes without a report, whatever the
refresh interval.
##########
be/src/io/cache/cache_lru_dumper.cpp:
##########
@@ -486,7 +486,11 @@ void CacheLRUDumper::restore_queue(LRUQueue& queue, const
std::string& queue_nam
return;
}
// TODO(zhengyu): we don't use stats yet, see if this will cause
any problem
- _mgr->add_cell(hash, ctx, offset, size,
FileBlock::State::DOWNLOADED, cache_lock);
+ // Each block goes back to the queue it was dumped from. The dump
records neither its
+ // tablet nor its class; both are filled in when its metadata is
loaded, which also
+ // moves it to the queue they call for, see
BlockFileCache::complete_loaded_cell().
+ _mgr->add_cell_in_queue(hash, ctx, ctx.cache_type, offset, size,
Review Comment:
Fixed in bee475608cd: the test now checks the cache queue the blocks are
restored to, with three entries, their count and their order.
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