corecursion commented on code in PR #15015: URL: https://github.com/apache/lucene/pull/15015#discussion_r2249017404
########## lucene/core/src/java/org/apache/lucene/index/MultiIndexMergeScheduler.java: ########## @@ -0,0 +1,203 @@ +/* + * 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.lucene.index; + +import java.io.IOException; +import org.apache.lucene.store.Directory; +import org.apache.lucene.util.InfoStream; + +class MultiIndexMergeScheduler extends MergeScheduler { + private final Directory directory; + private final CombinedMergeScheduler combinedMergeScheduler; + + /** The main MultiIndexMergeScheduler constructor -- use this one. */ + public MultiIndexMergeScheduler(Directory directory) { + this.directory = directory; + this.combinedMergeScheduler = CombinedMergeScheduler.singleton; + } + + /** Alternate MultiIndexMergeScheduler constructor for unit testing or tenant grouping. */ + public MultiIndexMergeScheduler( + Directory directory, CombinedMergeScheduler combinedMergeScheduler) { + this.directory = directory; + this.combinedMergeScheduler = combinedMergeScheduler; + } + + public Directory getDirectory() { + return directory; + } + + public CombinedMergeScheduler getCombinedMergeScheduler() { + return combinedMergeScheduler; + } + + @Override + public void merge(MergeSource mergeSource, MergeTrigger trigger) throws IOException { + var taggedMergeSource = + new CombinedMergeScheduler.TaggedMergeSource(mergeSource, this.directory); + this.combinedMergeScheduler.merge(taggedMergeSource, trigger); + } + + @Override + public Directory wrapForMerge(MergePolicy.OneMerge merge, Directory in) { + return this.combinedMergeScheduler.wrapForMerge(merge, in); + } + + /** Close this scheduler for one directory/index. Called automatically by IndexWriter. */ + @Override + public void close() throws IOException { + this.combinedMergeScheduler.close(this.directory); + } + + // We created this method because we cannot easily override the initialize() method + // in ConcurrentMergeScheduler. We don't need the initDynamicDefaults() part in the + // initialize() method, and only need the setInfoStream(). + public void setInfoStream(InfoStream infoStream) { + this.combinedMergeScheduler.setInfoStream(infoStream); + } + + /** + * CombinedMergeScheduler is used internally by MultiIndexMergeScheduler to balance resources + * across multiple indices. Normally you don't need to use this. + * + * <p>For testing purposes, or if partitioning of tenants into groups is needed for some reason, a + * CombinedMergeScheduler can be provided to the MultiIndexMergeScheduler constructor. + * + * <p>CombinedMergeScheduler should <b><i>not</i></b> be passed directly to IndexWriter. + */ + static class CombinedMergeScheduler extends ConcurrentMergeScheduler { + static final CombinedMergeScheduler singleton = new CombinedMergeScheduler(); + + // A filter pattern + static class TaggedMergeSource implements MergeScheduler.MergeSource { + private final MergeScheduler.MergeSource in; + private final Directory directory; + + TaggedMergeSource(MergeScheduler.MergeSource in, Directory directory) { + this.in = in; + this.directory = directory; + } + + public Directory getDirectory() { + return this.directory; + } + + @Override + public MergePolicy.OneMerge getNextMerge() { + return this.in.getNextMerge(); + } + + @Override + public void onMergeFinished(MergePolicy.OneMerge merge) { + this.in.onMergeFinished(merge); + } + + @Override + public boolean hasPendingMerges() { + return this.in.hasPendingMerges(); + } + + @Override + public void merge(MergePolicy.OneMerge merge) throws IOException { + this.in.merge(merge); + } + } + + // Same functionality as calling initialize() in MergeScheduler, used by + // MultiIndexMergeScheduler to + // initialize the wrapped per index CombinedMergeScheduler. + public void setInfoStream(InfoStream infoStream) { + this.infoStream = infoStream; + } + + // The implementation is copied from sync() in ConcurrentMergeScheduler in Lucene code, with + // only one additional check: + // ((InstrumentedMergeThread) t).getDirectory().equals(directory). + public void close(Directory directory) { + boolean interrupted = false; + try { + while (true) { + MergeThread toSync = null; + synchronized (this) { + for (MergeThread t : this.mergeThreads) { + // In case a merge thread is calling us, don't try to sync on + // itself, since that will never finish! + if (t.isAlive() + && t != Thread.currentThread() + // Only wait for merge threads for the current index to finish + && ((InstrumentedMergeThread) t).getDirectory().equals(directory)) { + toSync = t; + break; + } + } + } + if (toSync != null) { + try { + toSync.join(); + } catch ( + @SuppressWarnings("unused") + InterruptedException ie) { + // ignore this Exception, we will retry until all threads are dead + interrupted = true; + } + } else { + break; + } + } + } finally { + // finally, restore interrupt status: + if (interrupted) { + Thread.currentThread().interrupt(); + } + } + } + + @Override + protected synchronized ConcurrentMergeScheduler.MergeThread getMergeThread( Review Comment: removed `getMergeThread()` in [1f6e301](https://github.com/apache/lucene/pull/15015/commits/1f6e3016991f9b475f09ddcf165248a3945188fb) -- This is an automated message from the Apache Git Service. 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