sashapolo commented on code in PR #2030: URL: https://github.com/apache/ignite-3/pull/2030#discussion_r1197733914
########## modules/table/src/main/java/org/apache/ignite/internal/table/distributed/index/IndexBuilder.java: ########## @@ -0,0 +1,186 @@ +/* + * 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.ignite.internal.table.distributed.index; + +import java.util.Iterator; +import java.util.Map; +import java.util.Map.Entry; +import java.util.UUID; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.LinkedBlockingQueue; +import java.util.concurrent.ThreadPoolExecutor; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import org.apache.ignite.internal.close.ManuallyCloseable; +import org.apache.ignite.internal.logger.IgniteLogger; +import org.apache.ignite.internal.logger.Loggers; +import org.apache.ignite.internal.raft.service.RaftGroupService; +import org.apache.ignite.internal.storage.MvPartitionStorage; +import org.apache.ignite.internal.storage.index.IndexStorage; +import org.apache.ignite.internal.table.distributed.command.BuildIndexCommand; +import org.apache.ignite.internal.thread.NamedThreadFactory; +import org.apache.ignite.internal.util.IgniteSpinBusyLock; +import org.apache.ignite.internal.util.IgniteUtils; + +/** + * Class for managing the building of table indexes. + */ +public class IndexBuilder implements ManuallyCloseable { + private static final IgniteLogger LOG = Loggers.forClass(IndexBuilder.class); + + private static final int BATCH_SIZE = 100; + + private final ExecutorService executor; + + private final Map<IndexBuildTaskId, IndexBuildTask> indexBuildTaskById = new ConcurrentHashMap<>(); + + private final IgniteSpinBusyLock busyLock = new IgniteSpinBusyLock(); + + private final AtomicBoolean closeGuard = new AtomicBoolean(); + + /** + * Constructor. + * + * @param nodeName Node name. + * @param threadCount Number of threads to build indexes. + */ + public IndexBuilder(String nodeName, int threadCount) { + executor = new ThreadPoolExecutor( + threadCount, + threadCount, + 30, + TimeUnit.SECONDS, + new LinkedBlockingQueue<>(), + NamedThreadFactory.create(nodeName, "build-index", LOG) + ); + } + + /** + * Starts building the index if it is not already built or is not yet in progress. + * + * <p>Index is built in batches using {@link BuildIndexCommand} (via raft), batches are sent sequentially. + * + * <p>It is expected that the index building is triggered by the leader of the raft group. + * + * @param tableId Table ID. + * @param partitionId Partition ID. + * @param indexId Index ID. + * @param indexStorage Index storage to build. + * @param partitionStorage Multi-versioned partition storage. + * @param raftClient Raft client. + */ + // TODO: IGNITE-19498 Perhaps we need to start building the index only once + public void startBuildIndex( + UUID tableId, + int partitionId, + UUID indexId, + IndexStorage indexStorage, + MvPartitionStorage partitionStorage, + RaftGroupService raftClient + ) { + inBusyLock(() -> { + if (indexStorage.getNextRowIdToBuild() == null) { + return; + } + + IndexBuildTaskId taskId = new IndexBuildTaskId(tableId, partitionId, indexId); + + IndexBuildTask newTask = new IndexBuildTask(taskId, indexStorage, partitionStorage, raftClient, executor, busyLock, BATCH_SIZE); + + IndexBuildTask previousTask = indexBuildTaskById.putIfAbsent(taskId, newTask); + + if (previousTask != null) { + // Index building is already in progress. + return; + } + + newTask.start(); + + newTask.getTaskFuture().whenComplete((unused, throwable) -> indexBuildTaskById.remove(taskId)); + }); + } + + /** + * Stops index building if it is in progress. + * + * @param tableId Table ID. + * @param partitionId Partition ID. + * @param indexId Index ID. + */ + public void stopBuildIndex(UUID tableId, int partitionId, UUID indexId) { + inBusyLock(() -> { + IndexBuildTask removed = indexBuildTaskById.remove(new IndexBuildTaskId(tableId, partitionId, indexId)); + + if (removed != null) { + removed.stop(); + } + }); + } + + /** + * Stops building all indexes (for a table partition) if they are in progress. + * + * @param tableId Table ID. + * @param partitionId Partition ID. + */ + public void stopBuildIndexes(UUID tableId, int partitionId) { + for (Iterator<Entry<IndexBuildTaskId, IndexBuildTask>> it = indexBuildTaskById.entrySet().iterator(); it.hasNext(); ) { + if (!busyLock.enterBusy()) { + return; + } + + try { + Entry<IndexBuildTaskId, IndexBuildTask> entry = it.next(); + + IndexBuildTaskId taskId = entry.getKey(); + + if (tableId.equals(taskId.getTableId()) && partitionId == taskId.getPartitionId()) { + it.remove(); + + entry.getValue().stop(); + } + } finally { + busyLock.leaveBusy(); + } + } + } + + @Override + public void close() { + if (!closeGuard.compareAndSet(false, true)) { + return; + } + + busyLock.block(); Review Comment: Shall we still clear the map? -- This is an automated message from the Apache Git Service. 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