| /* |
| * 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.samza.container; |
| |
| import com.google.common.base.Preconditions; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.samza.coordinator.stream.CoordinatorStreamValueSerde; |
| import org.apache.samza.coordinator.stream.messages.SetExecutionEnvContainerIdMapping; |
| import org.apache.samza.metadatastore.MetadataStore; |
| import org.apache.samza.serializers.Serde; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Used for persisting and reading the execution environment container id information into the metadata store. |
| * Processor id (logical Samza processor id) to execution environment container id (ex: yarn container id) is written. |
| **/ |
| public class ExecutionContainerIdManager { |
| private static final Logger LOG = LoggerFactory.getLogger(ExecutionContainerIdManager.class); |
| |
| private final Serde<String> valueSerde; |
| private final MetadataStore metadataStore; |
| |
| /** |
| * Builds the ExecutionContainerIdManager based upon the provided {@link MetadataStore} that is instantiated. |
| * Uses the {@link CoordinatorStreamValueSerde} to serialize messages before reading/writing into metadata store. |
| * @param metadataStore an instance of {@link MetadataStore} to read/write the processor container id mapping. |
| */ |
| public ExecutionContainerIdManager(MetadataStore metadataStore) { |
| this.metadataStore = metadataStore; |
| this.valueSerde = new CoordinatorStreamValueSerde(SetExecutionEnvContainerIdMapping.TYPE); |
| } |
| |
| public void writeExecutionEnvironmentContainerIdMapping(String processorId, String executionEnvContainerId) { |
| Preconditions.checkNotNull(processorId, "Container's logical processor id can not be null."); |
| Preconditions.checkNotNull(executionEnvContainerId, "Container's physical execution environment container id can not be null."); |
| LOG.info("Processor {} has executionEnvContainerId as {}", processorId, executionEnvContainerId); |
| metadataStore.put(processorId, valueSerde.toBytes(executionEnvContainerId)); |
| metadataStore.flush(); |
| } |
| |
| public Map<String, String> readExecutionEnvironmentContainerIdMapping() { |
| Map<String, String> executionEnvironmentContainerIdMapping = new HashMap<>(); |
| metadataStore.all().forEach((processorId, valueBytes) -> { |
| if (valueBytes != null) { |
| String executionEnvContainerId = valueSerde.fromBytes(valueBytes); |
| executionEnvironmentContainerIdMapping.put(processorId, executionEnvContainerId); |
| } |
| }); |
| if (LOG.isDebugEnabled()) { |
| for (Map.Entry<String, String> entry : executionEnvironmentContainerIdMapping.entrySet()) { |
| LOG.debug("Processor {} has executionEnvContainerId as {}", entry.getKey(), entry.getValue()); |
| } |
| } |
| return executionEnvironmentContainerIdMapping; |
| } |
| |
| public void close() { |
| metadataStore.close(); |
| } |
| } |