| /** |
| * 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.pulsar.metadata.impl.batching; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.EnumSet; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.pulsar.metadata.api.GetResult; |
| import org.apache.pulsar.metadata.api.MetadataStoreConfig; |
| import org.apache.pulsar.metadata.api.Stat; |
| import org.apache.pulsar.metadata.api.extended.CreateOption; |
| import org.apache.pulsar.metadata.impl.AbstractMetadataStore; |
| import org.jctools.queues.MessagePassingQueue; |
| import org.jctools.queues.MpscUnboundedArrayQueue; |
| |
| @Slf4j |
| public abstract class AbstractBatchedMetadataStore extends AbstractMetadataStore { |
| |
| private final ScheduledFuture<?> scheduledTask; |
| private final MessagePassingQueue<MetadataOp> readOps; |
| private final MessagePassingQueue<MetadataOp> writeOps; |
| |
| private final AtomicBoolean flushInProgress = new AtomicBoolean(false); |
| |
| private final boolean enabled; |
| private final int maxDelayMillis; |
| private final int maxOperations; |
| private final int maxSize; |
| |
| protected AbstractBatchedMetadataStore(MetadataStoreConfig conf) { |
| super(); |
| |
| this.enabled = conf.isBatchingEnabled(); |
| this.maxDelayMillis = conf.getBatchingMaxDelayMillis(); |
| this.maxOperations = conf.getBatchingMaxOperations(); |
| this.maxSize = conf.getBatchingMaxSizeKb() * 1_024; |
| |
| if (enabled) { |
| readOps = new MpscUnboundedArrayQueue<>(10_000); |
| writeOps = new MpscUnboundedArrayQueue<>(10_000); |
| scheduledTask = |
| executor.scheduleAtFixedRate(this::flush, maxDelayMillis, maxDelayMillis, TimeUnit.MILLISECONDS); |
| } else { |
| scheduledTask = null; |
| readOps = null; |
| writeOps = null; |
| } |
| } |
| |
| @Override |
| public void close() throws Exception { |
| if (enabled) { |
| // Fail all the pending items |
| Exception ex = new IllegalStateException("Metadata store is getting closed"); |
| readOps.drain(op -> op.getFuture().completeExceptionally(ex)); |
| writeOps.drain(op -> op.getFuture().completeExceptionally(ex)); |
| |
| scheduledTask.cancel(true); |
| } |
| super.close(); |
| } |
| |
| private void flush() { |
| while (!readOps.isEmpty()) { |
| List<MetadataOp> ops = new ArrayList<>(); |
| readOps.drain(ops::add, maxOperations); |
| batchOperation(ops); |
| } |
| |
| while (!writeOps.isEmpty()) { |
| int batchSize = 0; |
| |
| List<MetadataOp> ops = new ArrayList<>(); |
| for (int i = 0; i < maxOperations; i++) { |
| MetadataOp op = writeOps.peek(); |
| if (op == null) { |
| break; |
| } |
| |
| if (i > 0 && (batchSize + op.size()) > maxSize) { |
| // We have already reached the max size, so flush the current batch |
| break; |
| } |
| |
| batchSize += op.size(); |
| ops.add(writeOps.poll()); |
| } |
| batchOperation(ops); |
| } |
| |
| flushInProgress.set(false); |
| } |
| |
| @Override |
| public final CompletableFuture<Optional<GetResult>> storeGet(String path) { |
| OpGet op = new OpGet(path); |
| enqueue(readOps, op); |
| return op.getFuture(); |
| } |
| |
| @Override |
| protected final CompletableFuture<List<String>> getChildrenFromStore(String path) { |
| OpGetChildren op = new OpGetChildren(path); |
| enqueue(readOps, op); |
| return op.getFuture(); |
| } |
| |
| @Override |
| protected final CompletableFuture<Void> storeDelete(String path, Optional<Long> expectedVersion) { |
| OpDelete op = new OpDelete(path, expectedVersion); |
| enqueue(writeOps, op); |
| return op.getFuture(); |
| } |
| |
| @Override |
| protected CompletableFuture<Stat> storePut(String path, byte[] data, Optional<Long> optExpectedVersion, |
| EnumSet<CreateOption> options) { |
| OpPut op = new OpPut(path, data, optExpectedVersion, options); |
| enqueue(writeOps, op); |
| return op.getFuture(); |
| } |
| |
| private void enqueue(MessagePassingQueue<MetadataOp> queue, MetadataOp op) { |
| if (enabled) { |
| if (!queue.offer(op)) { |
| // Execute individually if we're failing to enqueue |
| batchOperation(Collections.singletonList(op)); |
| return; |
| } |
| if (queue.size() > maxOperations && flushInProgress.compareAndSet(false, true)) { |
| executor.execute(this::flush); |
| } |
| } else { |
| batchOperation(Collections.singletonList(op)); |
| } |
| } |
| |
| protected abstract void batchOperation(List<MetadataOp> ops); |
| } |