xy720 commented on code in PR #68141: URL: https://github.com/apache/doris/pull/68141#discussion_r4041601165
########## fe/fe-core/src/main/java/org/apache/doris/mtmv/MTMVCacheManager.java: ########## @@ -0,0 +1,210 @@ +// 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. + +package org.apache.doris.mtmv; + +import org.apache.doris.catalog.Env; +import org.apache.doris.common.Config; +import org.apache.doris.common.ConfigBase.DefaultConfHandler; + +import com.github.benmanes.caffeine.cache.Cache; +import com.github.benmanes.caffeine.cache.Caffeine; +import com.github.benmanes.caffeine.cache.stats.CacheStats; +import com.google.common.annotations.VisibleForTesting; + +import java.lang.reflect.Field; +import java.time.Duration; +import java.util.Collections; +import java.util.List; +import java.util.Objects; +import java.util.concurrent.TimeUnit; +import java.util.stream.Collectors; + +/** + * FE-local cache manager for materialized view cache. + */ +public class MTMVCacheManager { + + private final Object swapLock = new Object(); + private volatile Cache<Key, MTMVCache> caches; + + public MTMVCacheManager() { + caches = build(Config.mtmv_cache_manage_num, Config.expire_mtmv_cache_in_fe_second); + } + + public MTMVCache getIfPresent(long mtmvId, boolean guarded) { + return caches.getIfPresent(new Key(mtmvId, guarded)); + } + + public void put(long mtmvId, boolean guarded, MTMVCache cache) { + Objects.requireNonNull(cache, "mtmv cache to publish must not be null"); + synchronized (swapLock) { + caches.put(new Key(mtmvId, guarded), cache); + } + } + + public void invalidate(long mtmvId) { + synchronized (swapLock) { + caches.invalidate(new Key(mtmvId, true)); + caches.invalidate(new Key(mtmvId, false)); + } + } + + public void invalidateAll() { + synchronized (swapLock) { + caches.invalidateAll(); + } + } + + public long size() { + return caches.estimatedSize(); + } + + /** False when the live maximum is 0, i.e. every put would be discarded immediately. */ + public boolean isEnabled() { + return caches.policy().eviction().map(eviction -> eviction.getMaximum() > 0).orElse(true); + } + + public Snapshot snapshot() { + Cache<Key, MTMVCache> current = caches; + CacheStats s = current.stats(); + return new Snapshot(current.estimatedSize(), s.hitCount(), s.missCount(), + s.evictionCount(), s.hitRate()); + } + + /** + * Snapshot for SHOW PROC '/mtmv_cache/hot'. Ordered by most-recently-accessed first when + * expireAfterAccess is enabled; falls back to iteration order with idleMs=-1 otherwise. + */ + public List<HotEntry> hotEntries(int limit) { + if (limit <= 0) { + return Collections.emptyList(); + } + Cache<Key, MTMVCache> current = caches; + return current.policy().expireAfterAccess() + .map(exp -> exp.youngest(stream -> stream + .limit(limit) + .map(entry -> { + Key k = entry.getKey(); + long expireMs = exp.getExpiresAfter(TimeUnit.MILLISECONDS); + long idleMs = Math.max(expireMs - entry.expiresAfter().toMillis(), 0L); + return new HotEntry(k.mtmvId, k.guarded, idleMs); + }) + .collect(Collectors.toList()))) + .orElseGet(() -> current.asMap().keySet().stream() + .limit(limit) + .map(k -> new HotEntry(k.mtmvId, k.guarded, -1L)) + .collect(Collectors.toList())); + } + + public void updateConfig() { + Cache<Key, MTMVCache> fresh = build(Config.mtmv_cache_manage_num, Config.expire_mtmv_cache_in_fe_second); + synchronized (swapLock) { + fresh.putAll(caches.asMap()); + fresh.cleanUp(); + caches = fresh; + } + } + + public static synchronized void reloadConfig() { + Env env = Env.getCurrentEnv(); Review Comment: cloud snapshot is not implemented yet, do not need to worry this. ########## fe/fe-core/src/main/java/org/apache/doris/catalog/MTMV.java: ########## @@ -302,12 +298,19 @@ public boolean addTaskResult(AlterMTMV alterMTMV, boolean isReplay) { } ivmInfo.clearBaselineRebuild(); } + // The refresh publishes a new plan, so every cache built before this commit is stale. + // Bump before publishing so an in-flight build cannot pass its generation check later. + boolean publishCache = needUpdateCache && cacheGeneration == rewriteCacheGeneration && !isDropped; + rewriteCacheGeneration++; if (needUpdateCache) { - if (cacheGeneration == rewriteCacheGeneration) { - // Initialize cacheWithGuard, cacheWithoutGuard will be lazily generated when needed - this.cacheWithGuard = mtmvCacheWithGuard; - // Clear the other cache to ensure consistency - this.cacheWithoutGuard = mtmvCacheWithoutGuard; + MTMVCacheManager manager = Env.getCurrentEnv().getMtmvCacheManager(); Review Comment: cloud snapshot is not implemented yet, do not need to worry this. -- This is an automated message from the Apache Git Service. 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