tanvipenumudy commented on code in PR #7550: URL: https://github.com/apache/ozone/pull/7550#discussion_r1886331851
########## hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/scm/client/OMBlockPrefetchClient.java: ########## @@ -0,0 +1,298 @@ +/** + * 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 + * <p> + * http://www.apache.org/licenses/LICENSE-2.0 + * <p> + * 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.hadoop.hdds.scm.client; + +import com.google.common.util.concurrent.ThreadFactoryBuilder; +import org.apache.hadoop.hdds.DFSConfigKeysLegacy; +import org.apache.hadoop.hdds.client.ECReplicationConfig; +import org.apache.hadoop.hdds.client.ReplicationConfig; +import org.apache.hadoop.hdds.conf.OzoneConfiguration; +import org.apache.hadoop.hdds.conf.ConfigurationSource; +import org.apache.hadoop.hdds.protocol.DatanodeDetails; +import org.apache.hadoop.hdds.protocol.proto.HddsProtos; +import org.apache.hadoop.hdds.scm.container.common.helpers.ExcludeList; +import org.apache.hadoop.hdds.scm.net.InnerNode; +import org.apache.hadoop.hdds.scm.net.NetworkTopology; +import org.apache.hadoop.hdds.scm.net.Node; +import org.apache.hadoop.hdds.scm.net.NodeImpl; +import org.apache.hadoop.net.CachedDNSToSwitchMapping; +import org.apache.hadoop.net.DNSToSwitchMapping; +import org.apache.hadoop.net.TableMapping; +import org.apache.hadoop.hdds.scm.protocol.ScmBlockLocationProtocol; +import org.apache.hadoop.hdds.scm.container.common.helpers.AllocatedBlock; +import org.apache.hadoop.util.ReflectionUtils; +import org.apache.hadoop.util.Time; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.TimeoutException; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ConcurrentLinkedDeque; + +import static org.apache.hadoop.hdds.scm.net.NetConstants.NODE_COST_DEFAULT; +import static org.apache.hadoop.ozone.OzoneConfigKeys.OZONE_OM_PREFETCH_MAX_BLOCKS; +import static org.apache.hadoop.ozone.OzoneConfigKeys.OZONE_OM_PREFETCH_MAX_BLOCKS_DEFAULT; +import static org.apache.hadoop.ozone.OzoneConfigKeys.OZONE_OM_PREFETCHED_BLOCKS_EXPIRY_INTERVAL; +import static org.apache.hadoop.ozone.OzoneConfigKeys.OZONE_OM_PREFETCHED_BLOCKS_EXPIRY_INTERVAL_DEFAULT; + +/** + * OMBlockPrefetchClient manages block prefetching for efficient write operations. + * It maintains a queue of allocated blocks per replication configuration and periodically removes expired blocks. + * The client refills the queue in the background to handle high-throughput scenarios efficiently. + */ +public class OMBlockPrefetchClient { + private static final Logger LOG = LoggerFactory.getLogger(OMBlockPrefetchClient.class); + private final ScmBlockLocationProtocol scmBlockLocationProtocol; + private int maxBlocks; + private boolean useHostname; + private DNSToSwitchMapping dnsToSwitchMapping; + private ScheduledExecutorService prefetchExecutor; + private final Map<ReplicationConfig, ConcurrentLinkedDeque<ExpiringAllocatedBlock>> blockQueueMap = + new ConcurrentHashMap<>(); + private long expiryDuration; + private OMBlockPrefetchMetrics metrics; + + private static final ReplicationConfig RATIS_THREE = + ReplicationConfig.fromProtoTypeAndFactor(HddsProtos.ReplicationType.RATIS, + HddsProtos.ReplicationFactor.THREE); + private static final ReplicationConfig RATIS_ONE = + ReplicationConfig.fromProtoTypeAndFactor(HddsProtos.ReplicationType.RATIS, + HddsProtos.ReplicationFactor.ONE); + private static final ReplicationConfig RS_3_2_1024 = + ReplicationConfig.fromProto(HddsProtos.ReplicationType.EC, null, + toProto(3, 2, ECReplicationConfig.EcCodec.RS, 1024)); + private static final ReplicationConfig RS_6_3_1024 = + ReplicationConfig.fromProto(HddsProtos.ReplicationType.EC, null, + toProto(6, 3, ECReplicationConfig.EcCodec.RS, 1024)); + private static final ReplicationConfig XOR_10_4_4096 = Review Comment: Thank you @sodonnel for pointing this out, will be incorporating the creation of these queues on demand! -- This is an automated message from the Apache Git Service. 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