github-code-scanning[bot] commented on code in PR #13197: URL: https://github.com/apache/druid/pull/13197#discussion_r1167364695
########## server/src/main/java/org/apache/druid/server/coordinator/balancer/TierSegmentBalancer.java: ########## @@ -0,0 +1,291 @@ +/* + * 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.druid.server.coordinator.balancer; + +import com.google.common.collect.Lists; +import org.apache.druid.client.ImmutableDruidDataSource; +import org.apache.druid.java.util.emitter.EmittingLogger; +import org.apache.druid.server.coordinator.CoordinatorDynamicConfig; +import org.apache.druid.server.coordinator.DruidCoordinatorRuntimeParams; +import org.apache.druid.server.coordinator.SegmentLoader; +import org.apache.druid.server.coordinator.ServerHolder; +import org.apache.druid.server.coordinator.stats.CoordinatorRunStats; +import org.apache.druid.server.coordinator.stats.Dimension; +import org.apache.druid.server.coordinator.stats.RowKey; +import org.apache.druid.server.coordinator.stats.Stats; +import org.apache.druid.timeline.DataSegment; +import org.apache.druid.timeline.SegmentId; + +import java.util.Collections; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; + +/** + * Balances segments within the servers of a tier using the balancer strategy. + * Segments are prioritized for move in the following order: + * <ul> + * <li>Segments loaded on decommissioning servers</li> + * <li>Segments loading on active servers</li> + * <li>Segments loaded on active servers</li> + * </ul> + */ +public class TierSegmentBalancer +{ + private static final EmittingLogger log = new EmittingLogger(TierSegmentBalancer.class); + + private final String tier; + private final DruidCoordinatorRuntimeParams params; + private final SegmentLoader loader; + + private final BalancerStrategy strategy; + private final CoordinatorDynamicConfig dynamicConfig; + private final CoordinatorRunStats runStats; + + private final Set<ServerHolder> allServers; + private final List<ServerHolder> activeServers; + private final List<ServerHolder> decommissioningServers; + private final int totalMaxSegmentsToMove; + + public TierSegmentBalancer( + String tier, + Set<ServerHolder> servers, + SegmentLoader loader, + DruidCoordinatorRuntimeParams params + ) + { + this.tier = tier; + this.params = params; + this.loader = loader; + + this.strategy = params.getBalancerStrategy(); + this.dynamicConfig = params.getCoordinatorDynamicConfig(); + this.totalMaxSegmentsToMove = dynamicConfig.getMaxSegmentsToMove(); + this.runStats = loader.getStats(); + + Map<Boolean, List<ServerHolder>> partitions = + servers.stream().collect(Collectors.partitioningBy(ServerHolder::isDecommissioning)); + decommissioningServers = partitions.get(true); + activeServers = partitions.get(false); + this.allServers = servers; + } + + public void run() + { + if (activeServers.isEmpty() || (activeServers.size() <= 1 && decommissioningServers.isEmpty())) { + log.warn( + "Skipping balance for tier [%s] with [%d] active servers and [%d] decomissioning servers.", + tier, activeServers.size(), decommissioningServers.size() + ); + return; + } + + log.info( + "Balancing segments in tier [%s] with [%d] active servers and [%d] decommissioning servers.", + tier, activeServers.size(), decommissioningServers.size() + ); + + // Move segments from decommissioning to active servers + int maxDecommPercentToMove = dynamicConfig.getDecommissioningMaxPercentOfMaxSegmentsToMove(); + int maxDecommSegmentsToMove = (int) Math.ceil(totalMaxSegmentsToMove * (maxDecommPercentToMove / 100.0)); + int movedDecommSegments = moveSegmentsFromTo(decommissioningServers, activeServers, maxDecommSegmentsToMove); + log.info( + "Moved [%d] segments out of max [%d (%d%%)] from decommissioning to active servers.", + movedDecommSegments, maxDecommSegmentsToMove, maxDecommPercentToMove + ); + + // Move segments across active servers + int maxGeneralSegmentsToMove = totalMaxSegmentsToMove - movedDecommSegments; + int movedGeneralSegments = moveSegmentsFromTo(activeServers, activeServers, maxGeneralSegmentsToMove); + log.info( + "Moved [%d] segments out of max [%d] between active servers.", + movedGeneralSegments, maxGeneralSegmentsToMove + ); + + if (dynamicConfig.emitBalancingStats()) { + strategy.emitStats(tier, loader.getStats(), Lists.newArrayList(allServers)); + } + } + + private int moveSegmentsFromTo( + List<ServerHolder> sourceServers, + List<ServerHolder> destServers, + int maxSegmentsToMove + ) + { + if (maxSegmentsToMove <= 0 || sourceServers.isEmpty() || destServers.isEmpty()) { + return 0; + } + + Iterator<BalancerSegmentHolder> pickedSegments + = pickSegmentsFrom(sourceServers, maxSegmentsToMove, true); + int movedCount = moveSegmentsTo(destServers, pickedSegments, maxSegmentsToMove); + + maxSegmentsToMove -= movedCount; + pickedSegments = pickSegmentsFrom(sourceServers, maxSegmentsToMove, false); + movedCount += moveSegmentsTo(destServers, pickedSegments, maxSegmentsToMove); + + return movedCount; + } + + private Iterator<BalancerSegmentHolder> pickSegmentsFrom( + List<ServerHolder> sourceServers, + int maxSegmentsToPick, + boolean pickLoadingSegments + ) + { + if (maxSegmentsToPick <= 0 || sourceServers.isEmpty()) { + return Collections.emptyIterator(); + } else if (dynamicConfig.useBatchedSegmentSampler()) { Review Comment: ## Deprecated method or constructor invocation Invoking [CoordinatorDynamicConfig.useBatchedSegmentSampler](1) should be avoided because it has been deprecated. [Show more details](https://github.com/apache/druid/security/code-scanning/4819) ########## server/src/main/java/org/apache/druid/server/coordinator/balancer/TierSegmentBalancer.java: ########## @@ -0,0 +1,291 @@ +/* + * 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.druid.server.coordinator.balancer; + +import com.google.common.collect.Lists; +import org.apache.druid.client.ImmutableDruidDataSource; +import org.apache.druid.java.util.emitter.EmittingLogger; +import org.apache.druid.server.coordinator.CoordinatorDynamicConfig; +import org.apache.druid.server.coordinator.DruidCoordinatorRuntimeParams; +import org.apache.druid.server.coordinator.SegmentLoader; +import org.apache.druid.server.coordinator.ServerHolder; +import org.apache.druid.server.coordinator.stats.CoordinatorRunStats; +import org.apache.druid.server.coordinator.stats.Dimension; +import org.apache.druid.server.coordinator.stats.RowKey; +import org.apache.druid.server.coordinator.stats.Stats; +import org.apache.druid.timeline.DataSegment; +import org.apache.druid.timeline.SegmentId; + +import java.util.Collections; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; + +/** + * Balances segments within the servers of a tier using the balancer strategy. + * Segments are prioritized for move in the following order: + * <ul> + * <li>Segments loaded on decommissioning servers</li> + * <li>Segments loading on active servers</li> + * <li>Segments loaded on active servers</li> + * </ul> + */ +public class TierSegmentBalancer +{ + private static final EmittingLogger log = new EmittingLogger(TierSegmentBalancer.class); + + private final String tier; + private final DruidCoordinatorRuntimeParams params; + private final SegmentLoader loader; + + private final BalancerStrategy strategy; + private final CoordinatorDynamicConfig dynamicConfig; + private final CoordinatorRunStats runStats; + + private final Set<ServerHolder> allServers; + private final List<ServerHolder> activeServers; + private final List<ServerHolder> decommissioningServers; + private final int totalMaxSegmentsToMove; + + public TierSegmentBalancer( + String tier, + Set<ServerHolder> servers, + SegmentLoader loader, + DruidCoordinatorRuntimeParams params + ) + { + this.tier = tier; + this.params = params; + this.loader = loader; + + this.strategy = params.getBalancerStrategy(); + this.dynamicConfig = params.getCoordinatorDynamicConfig(); + this.totalMaxSegmentsToMove = dynamicConfig.getMaxSegmentsToMove(); + this.runStats = loader.getStats(); + + Map<Boolean, List<ServerHolder>> partitions = + servers.stream().collect(Collectors.partitioningBy(ServerHolder::isDecommissioning)); + decommissioningServers = partitions.get(true); + activeServers = partitions.get(false); + this.allServers = servers; + } + + public void run() + { + if (activeServers.isEmpty() || (activeServers.size() <= 1 && decommissioningServers.isEmpty())) { + log.warn( + "Skipping balance for tier [%s] with [%d] active servers and [%d] decomissioning servers.", + tier, activeServers.size(), decommissioningServers.size() + ); + return; + } + + log.info( + "Balancing segments in tier [%s] with [%d] active servers and [%d] decommissioning servers.", + tier, activeServers.size(), decommissioningServers.size() + ); + + // Move segments from decommissioning to active servers + int maxDecommPercentToMove = dynamicConfig.getDecommissioningMaxPercentOfMaxSegmentsToMove(); + int maxDecommSegmentsToMove = (int) Math.ceil(totalMaxSegmentsToMove * (maxDecommPercentToMove / 100.0)); + int movedDecommSegments = moveSegmentsFromTo(decommissioningServers, activeServers, maxDecommSegmentsToMove); + log.info( + "Moved [%d] segments out of max [%d (%d%%)] from decommissioning to active servers.", + movedDecommSegments, maxDecommSegmentsToMove, maxDecommPercentToMove + ); + + // Move segments across active servers + int maxGeneralSegmentsToMove = totalMaxSegmentsToMove - movedDecommSegments; + int movedGeneralSegments = moveSegmentsFromTo(activeServers, activeServers, maxGeneralSegmentsToMove); + log.info( + "Moved [%d] segments out of max [%d] between active servers.", + movedGeneralSegments, maxGeneralSegmentsToMove + ); + + if (dynamicConfig.emitBalancingStats()) { + strategy.emitStats(tier, loader.getStats(), Lists.newArrayList(allServers)); + } + } + + private int moveSegmentsFromTo( + List<ServerHolder> sourceServers, + List<ServerHolder> destServers, + int maxSegmentsToMove + ) + { + if (maxSegmentsToMove <= 0 || sourceServers.isEmpty() || destServers.isEmpty()) { + return 0; + } + + Iterator<BalancerSegmentHolder> pickedSegments + = pickSegmentsFrom(sourceServers, maxSegmentsToMove, true); + int movedCount = moveSegmentsTo(destServers, pickedSegments, maxSegmentsToMove); + + maxSegmentsToMove -= movedCount; + pickedSegments = pickSegmentsFrom(sourceServers, maxSegmentsToMove, false); + movedCount += moveSegmentsTo(destServers, pickedSegments, maxSegmentsToMove); + + return movedCount; + } + + private Iterator<BalancerSegmentHolder> pickSegmentsFrom( + List<ServerHolder> sourceServers, + int maxSegmentsToPick, + boolean pickLoadingSegments + ) + { + if (maxSegmentsToPick <= 0 || sourceServers.isEmpty()) { + return Collections.emptyIterator(); + } else if (dynamicConfig.useBatchedSegmentSampler()) { + return strategy.pickSegmentsToMove( + sourceServers, + params.getBroadcastDatasources(), + maxSegmentsToPick, + pickLoadingSegments + ); + } else { + if (pickLoadingSegments) { + return Collections.emptyIterator(); + } else { + return strategy.pickSegmentsToMove( + sourceServers, + params.getBroadcastDatasources(), + dynamicConfig.getPercentOfSegmentsToConsiderPerMove() Review Comment: ## Deprecated method or constructor invocation Invoking [CoordinatorDynamicConfig.getPercentOfSegmentsToConsiderPerMove](1) should be avoided because it has been deprecated. [Show more details](https://github.com/apache/druid/security/code-scanning/4821) ########## server/src/main/java/org/apache/druid/server/coordinator/balancer/TierSegmentBalancer.java: ########## @@ -0,0 +1,291 @@ +/* + * 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.druid.server.coordinator.balancer; + +import com.google.common.collect.Lists; +import org.apache.druid.client.ImmutableDruidDataSource; +import org.apache.druid.java.util.emitter.EmittingLogger; +import org.apache.druid.server.coordinator.CoordinatorDynamicConfig; +import org.apache.druid.server.coordinator.DruidCoordinatorRuntimeParams; +import org.apache.druid.server.coordinator.SegmentLoader; +import org.apache.druid.server.coordinator.ServerHolder; +import org.apache.druid.server.coordinator.stats.CoordinatorRunStats; +import org.apache.druid.server.coordinator.stats.Dimension; +import org.apache.druid.server.coordinator.stats.RowKey; +import org.apache.druid.server.coordinator.stats.Stats; +import org.apache.druid.timeline.DataSegment; +import org.apache.druid.timeline.SegmentId; + +import java.util.Collections; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; + +/** + * Balances segments within the servers of a tier using the balancer strategy. + * Segments are prioritized for move in the following order: + * <ul> + * <li>Segments loaded on decommissioning servers</li> + * <li>Segments loading on active servers</li> + * <li>Segments loaded on active servers</li> + * </ul> + */ +public class TierSegmentBalancer +{ + private static final EmittingLogger log = new EmittingLogger(TierSegmentBalancer.class); + + private final String tier; + private final DruidCoordinatorRuntimeParams params; + private final SegmentLoader loader; + + private final BalancerStrategy strategy; + private final CoordinatorDynamicConfig dynamicConfig; + private final CoordinatorRunStats runStats; + + private final Set<ServerHolder> allServers; + private final List<ServerHolder> activeServers; + private final List<ServerHolder> decommissioningServers; + private final int totalMaxSegmentsToMove; + + public TierSegmentBalancer( + String tier, + Set<ServerHolder> servers, + SegmentLoader loader, + DruidCoordinatorRuntimeParams params + ) + { + this.tier = tier; + this.params = params; + this.loader = loader; + + this.strategy = params.getBalancerStrategy(); + this.dynamicConfig = params.getCoordinatorDynamicConfig(); + this.totalMaxSegmentsToMove = dynamicConfig.getMaxSegmentsToMove(); + this.runStats = loader.getStats(); + + Map<Boolean, List<ServerHolder>> partitions = + servers.stream().collect(Collectors.partitioningBy(ServerHolder::isDecommissioning)); + decommissioningServers = partitions.get(true); + activeServers = partitions.get(false); + this.allServers = servers; + } + + public void run() + { + if (activeServers.isEmpty() || (activeServers.size() <= 1 && decommissioningServers.isEmpty())) { + log.warn( + "Skipping balance for tier [%s] with [%d] active servers and [%d] decomissioning servers.", + tier, activeServers.size(), decommissioningServers.size() + ); + return; + } + + log.info( + "Balancing segments in tier [%s] with [%d] active servers and [%d] decommissioning servers.", + tier, activeServers.size(), decommissioningServers.size() + ); + + // Move segments from decommissioning to active servers + int maxDecommPercentToMove = dynamicConfig.getDecommissioningMaxPercentOfMaxSegmentsToMove(); Review Comment: ## Deprecated method or constructor invocation Invoking [CoordinatorDynamicConfig.getDecommissioningMaxPercentOfMaxSegmentsToMove](1) should be avoided because it has been deprecated. [Show more details](https://github.com/apache/druid/security/code-scanning/4818) ########## server/src/main/java/org/apache/druid/server/coordinator/balancer/TierSegmentBalancer.java: ########## @@ -0,0 +1,291 @@ +/* + * 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.druid.server.coordinator.balancer; + +import com.google.common.collect.Lists; +import org.apache.druid.client.ImmutableDruidDataSource; +import org.apache.druid.java.util.emitter.EmittingLogger; +import org.apache.druid.server.coordinator.CoordinatorDynamicConfig; +import org.apache.druid.server.coordinator.DruidCoordinatorRuntimeParams; +import org.apache.druid.server.coordinator.SegmentLoader; +import org.apache.druid.server.coordinator.ServerHolder; +import org.apache.druid.server.coordinator.stats.CoordinatorRunStats; +import org.apache.druid.server.coordinator.stats.Dimension; +import org.apache.druid.server.coordinator.stats.RowKey; +import org.apache.druid.server.coordinator.stats.Stats; +import org.apache.druid.timeline.DataSegment; +import org.apache.druid.timeline.SegmentId; + +import java.util.Collections; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; + +/** + * Balances segments within the servers of a tier using the balancer strategy. + * Segments are prioritized for move in the following order: + * <ul> + * <li>Segments loaded on decommissioning servers</li> + * <li>Segments loading on active servers</li> + * <li>Segments loaded on active servers</li> + * </ul> + */ +public class TierSegmentBalancer +{ + private static final EmittingLogger log = new EmittingLogger(TierSegmentBalancer.class); + + private final String tier; + private final DruidCoordinatorRuntimeParams params; + private final SegmentLoader loader; + + private final BalancerStrategy strategy; + private final CoordinatorDynamicConfig dynamicConfig; + private final CoordinatorRunStats runStats; + + private final Set<ServerHolder> allServers; + private final List<ServerHolder> activeServers; + private final List<ServerHolder> decommissioningServers; + private final int totalMaxSegmentsToMove; + + public TierSegmentBalancer( + String tier, + Set<ServerHolder> servers, + SegmentLoader loader, + DruidCoordinatorRuntimeParams params + ) + { + this.tier = tier; + this.params = params; + this.loader = loader; + + this.strategy = params.getBalancerStrategy(); + this.dynamicConfig = params.getCoordinatorDynamicConfig(); + this.totalMaxSegmentsToMove = dynamicConfig.getMaxSegmentsToMove(); + this.runStats = loader.getStats(); + + Map<Boolean, List<ServerHolder>> partitions = + servers.stream().collect(Collectors.partitioningBy(ServerHolder::isDecommissioning)); + decommissioningServers = partitions.get(true); + activeServers = partitions.get(false); + this.allServers = servers; + } + + public void run() + { + if (activeServers.isEmpty() || (activeServers.size() <= 1 && decommissioningServers.isEmpty())) { + log.warn( + "Skipping balance for tier [%s] with [%d] active servers and [%d] decomissioning servers.", + tier, activeServers.size(), decommissioningServers.size() + ); + return; + } + + log.info( + "Balancing segments in tier [%s] with [%d] active servers and [%d] decommissioning servers.", + tier, activeServers.size(), decommissioningServers.size() + ); + + // Move segments from decommissioning to active servers + int maxDecommPercentToMove = dynamicConfig.getDecommissioningMaxPercentOfMaxSegmentsToMove(); + int maxDecommSegmentsToMove = (int) Math.ceil(totalMaxSegmentsToMove * (maxDecommPercentToMove / 100.0)); + int movedDecommSegments = moveSegmentsFromTo(decommissioningServers, activeServers, maxDecommSegmentsToMove); + log.info( + "Moved [%d] segments out of max [%d (%d%%)] from decommissioning to active servers.", + movedDecommSegments, maxDecommSegmentsToMove, maxDecommPercentToMove + ); + + // Move segments across active servers + int maxGeneralSegmentsToMove = totalMaxSegmentsToMove - movedDecommSegments; + int movedGeneralSegments = moveSegmentsFromTo(activeServers, activeServers, maxGeneralSegmentsToMove); + log.info( + "Moved [%d] segments out of max [%d] between active servers.", + movedGeneralSegments, maxGeneralSegmentsToMove + ); + + if (dynamicConfig.emitBalancingStats()) { + strategy.emitStats(tier, loader.getStats(), Lists.newArrayList(allServers)); + } + } + + private int moveSegmentsFromTo( + List<ServerHolder> sourceServers, + List<ServerHolder> destServers, + int maxSegmentsToMove + ) + { + if (maxSegmentsToMove <= 0 || sourceServers.isEmpty() || destServers.isEmpty()) { + return 0; + } + + Iterator<BalancerSegmentHolder> pickedSegments + = pickSegmentsFrom(sourceServers, maxSegmentsToMove, true); + int movedCount = moveSegmentsTo(destServers, pickedSegments, maxSegmentsToMove); + + maxSegmentsToMove -= movedCount; + pickedSegments = pickSegmentsFrom(sourceServers, maxSegmentsToMove, false); + movedCount += moveSegmentsTo(destServers, pickedSegments, maxSegmentsToMove); + + return movedCount; + } + + private Iterator<BalancerSegmentHolder> pickSegmentsFrom( + List<ServerHolder> sourceServers, + int maxSegmentsToPick, + boolean pickLoadingSegments + ) + { + if (maxSegmentsToPick <= 0 || sourceServers.isEmpty()) { + return Collections.emptyIterator(); + } else if (dynamicConfig.useBatchedSegmentSampler()) { + return strategy.pickSegmentsToMove( + sourceServers, + params.getBroadcastDatasources(), + maxSegmentsToPick, + pickLoadingSegments + ); + } else { + if (pickLoadingSegments) { + return Collections.emptyIterator(); + } else { + return strategy.pickSegmentsToMove( + sourceServers, + params.getBroadcastDatasources(), + dynamicConfig.getPercentOfSegmentsToConsiderPerMove() + ); Review Comment: ## Deprecated method or constructor invocation Invoking [BalancerStrategy.pickSegmentsToMove](1) should be avoided because it has been deprecated. 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