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[FLINK-13056][runtime] Introduce FastRestartPipelinedRegionStrategy
This strategy has better failover handling performance over RestartPipelinedRegionStrategy. The side effect is slower region building and more cache in memory.
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...pache/flink/runtime/executiongraph/failover/flip1/FastRestartPipelinedRegionStrategy.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.runtime.executiongraph.failover.flip1; | ||
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| import org.apache.flink.runtime.jobgraph.IntermediateResultPartitionID; | ||
| import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.HashSet; | ||
| import java.util.IdentityHashMap; | ||
| import java.util.Map; | ||
| import java.util.Queue; | ||
| import java.util.Set; | ||
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| /** | ||
| * This failover strategy makes the same restart decision as {@link RestartPipelinedRegionStrategy}. | ||
| * It has better failover handling performance at the cost of slower region building and more memory | ||
| * used for region boundary cache. | ||
| */ | ||
| public class FastRestartPipelinedRegionStrategy extends RestartPipelinedRegionStrategy { | ||
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| /** Maps a failover region to its input result partitions. */ | ||
| private final IdentityHashMap<FailoverRegion, Collection<IntermediateResultPartitionID>> regionInputs; | ||
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| /** Maps a failover region to its consumer regions. */ | ||
| private final IdentityHashMap<FailoverRegion, Collection<FailoverRegion>> regionConsumers; | ||
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| /** Maps result partition id to its producer failover region. Only for inter-region consumed result partitions. */ | ||
| private final Map<IntermediateResultPartitionID, FailoverRegion> resultPartitionProducerRegion; | ||
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| /** | ||
| * Creates a new failover strategy to restart pipelined regions that works on the given topology. | ||
| * | ||
| * @param topology containing info about all the vertices and edges | ||
| * @param resultPartitionAvailabilityChecker helps to query result partition availability | ||
| */ | ||
| public FastRestartPipelinedRegionStrategy( | ||
| final FailoverTopology<?, ?> topology, | ||
| final ResultPartitionAvailabilityChecker resultPartitionAvailabilityChecker) { | ||
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| super(topology, resultPartitionAvailabilityChecker); | ||
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| this.regionInputs = new IdentityHashMap<>(); | ||
| this.regionConsumers = new IdentityHashMap<>(); | ||
| this.resultPartitionProducerRegion = new HashMap<>(); | ||
| buildRegionInputsAndOutputs(); | ||
| } | ||
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| private void buildRegionInputsAndOutputs() { | ||
| for (FailoverRegion region : regions) { | ||
| final Set<IntermediateResultPartitionID> consumedExternalResultPartitions = new HashSet<>(); | ||
| final Set<ExecutionVertexID> externalConsumerVertices = new HashSet<>(); | ||
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| final Set<? extends FailoverVertex<?, ?>> regionVertices = region.getAllExecutionVertices(); | ||
| for (FailoverVertex<?, ?> vertex : regionVertices) { | ||
| for (FailoverResultPartition<?, ?> consumedResultPartition : vertex.getConsumedResults()) { | ||
| if (!regionVertices.contains(consumedResultPartition.getProducer())) { | ||
| consumedExternalResultPartitions.add(consumedResultPartition.getId()); | ||
| } | ||
| } | ||
| for (FailoverResultPartition<?, ?> producedResult : vertex.getProducedResults()) { | ||
| for (FailoverVertex<?, ?> consumerVertex : producedResult.getConsumers()) { | ||
| if (!regionVertices.contains(consumerVertex)) { | ||
| externalConsumerVertices.add(consumerVertex.getId()); | ||
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| this.resultPartitionProducerRegion.put(producedResult.getId(), region); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| final Set<FailoverRegion> consumerRegions = Collections.newSetFromMap(new IdentityHashMap<>()); | ||
| externalConsumerVertices.forEach(id -> consumerRegions.add(getFailoverRegion(id))); | ||
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| this.regionInputs.put(region, new ArrayList<>(consumedExternalResultPartitions)); | ||
| this.regionConsumers.put(region, new ArrayList<>(consumerRegions)); | ||
| } | ||
| } | ||
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| @Override | ||
| protected void determineProducerRegionsToVisit( | ||
| final FailoverRegion currentRegion, | ||
| final Queue<FailoverRegion> regionsToVisit, | ||
| final Set<FailoverRegion> visitedRegions) { | ||
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| for (IntermediateResultPartitionID resultPartitionID : regionInputs.get(currentRegion)) { | ||
| if (!isResultPartitionAvailable(resultPartitionID)) { | ||
| final FailoverRegion producerRegion = resultPartitionProducerRegion.get(resultPartitionID); | ||
| if (!visitedRegions.contains(producerRegion)) { | ||
| visitedRegions.add(producerRegion); | ||
| regionsToVisit.add(producerRegion); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| protected void determineConsumerRegionsToVisit( | ||
| final FailoverRegion currentRegion, | ||
| final Queue<FailoverRegion> regionsToVisit, | ||
| final Set<FailoverRegion> visitedRegions) { | ||
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| for (FailoverRegion consumerRegion : regionConsumers.get(currentRegion)) { | ||
| if (!visitedRegions.contains(consumerRegion)) { | ||
| visitedRegions.add(consumerRegion); | ||
| regionsToVisit.add(consumerRegion); | ||
| } | ||
| } | ||
| } | ||
| } |
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30
...e/flink/runtime/executiongraph/failover/flip1/FastRestartPipelinedRegionStrategyTest.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.runtime.executiongraph.failover.flip1; | ||
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| /** | ||
| * Tests the failure handling logic of {@link FastRestartPipelinedRegionStrategy}. | ||
| */ | ||
| public class FastRestartPipelinedRegionStrategyTest extends RestartPipelinedRegionStrategyTest { | ||
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| @Override | ||
| protected FastRestartPipelinedRegionStrategy createFailoverStrategy(FailoverTopology topology) { | ||
| return new FastRestartPipelinedRegionStrategy(topology, resultPartitionID -> true); | ||
| } | ||
| } |
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