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[FLINK-15667][k8s] Support to mount custom Hadoop Configurations
This closes apache#11415 .
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186 changes: 186 additions & 0 deletions
186
...main/java/org/apache/flink/kubernetes/kubeclient/decorators/HadoopConfMountDecorator.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:https://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.kubernetes.kubeclient.decorators; | ||
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| import org.apache.flink.kubernetes.kubeclient.FlinkPod; | ||
| import org.apache.flink.kubernetes.kubeclient.parameters.AbstractKubernetesParameters; | ||
| import org.apache.flink.kubernetes.utils.Constants; | ||
| import org.apache.flink.util.FileUtils; | ||
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| import io.fabric8.kubernetes.api.model.ConfigMap; | ||
| import io.fabric8.kubernetes.api.model.ConfigMapBuilder; | ||
| import io.fabric8.kubernetes.api.model.Container; | ||
| import io.fabric8.kubernetes.api.model.ContainerBuilder; | ||
| import io.fabric8.kubernetes.api.model.HasMetadata; | ||
| import io.fabric8.kubernetes.api.model.KeyToPath; | ||
| import io.fabric8.kubernetes.api.model.KeyToPathBuilder; | ||
| import io.fabric8.kubernetes.api.model.Pod; | ||
| import io.fabric8.kubernetes.api.model.PodBuilder; | ||
| import io.fabric8.kubernetes.api.model.Volume; | ||
| import io.fabric8.kubernetes.api.model.VolumeBuilder; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.stream.Collectors; | ||
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| import static org.apache.flink.util.Preconditions.checkNotNull; | ||
|
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| /** | ||
| * Mount the custom Hadoop Configuration to the JobManager(s)/TaskManagers. We provide two options: | ||
| * 1. Mount an existing ConfigMap containing custom Hadoop Configuration. | ||
| * 2. Create and mount a dedicated ConfigMap containing the custom Hadoop configuration from a local directory | ||
| * specified via the HADOOP_CONF_DIR or HADOOP_HOME environment variable. | ||
| */ | ||
| public class HadoopConfMountDecorator extends AbstractKubernetesStepDecorator { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(HadoopConfMountDecorator.class); | ||
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| private final AbstractKubernetesParameters kubernetesParameters; | ||
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| public HadoopConfMountDecorator(AbstractKubernetesParameters kubernetesParameters) { | ||
| this.kubernetesParameters = checkNotNull(kubernetesParameters); | ||
| } | ||
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| @Override | ||
| public FlinkPod decorateFlinkPod(FlinkPod flinkPod) { | ||
| Volume hadoopConfVolume; | ||
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| final Optional<String> existingConfigMap = kubernetesParameters.getExistingHadoopConfigurationConfigMap(); | ||
| if (existingConfigMap.isPresent()) { | ||
| hadoopConfVolume = new VolumeBuilder() | ||
| .withName(Constants.HADOOP_CONF_VOLUME) | ||
| .withNewConfigMap() | ||
| .withName(existingConfigMap.get()) | ||
| .endConfigMap() | ||
| .build(); | ||
| } else { | ||
| final Optional<String> localHadoopConfigurationDirectory = kubernetesParameters.getLocalHadoopConfigurationDirectory(); | ||
| if (!localHadoopConfigurationDirectory.isPresent()) { | ||
| return flinkPod; | ||
| } | ||
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| final List<File> hadoopConfigurationFileItems = getHadoopConfigurationFileItems(localHadoopConfigurationDirectory.get()); | ||
| if (hadoopConfigurationFileItems.isEmpty()) { | ||
| LOG.warn("Found 0 files in directory {}, skip to mount the Hadoop Configuration ConfigMap.", | ||
| localHadoopConfigurationDirectory.get()); | ||
| return flinkPod; | ||
| } | ||
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| final List<KeyToPath> keyToPaths = hadoopConfigurationFileItems.stream() | ||
| .map(file -> new KeyToPathBuilder() | ||
| .withKey(file.getName()) | ||
| .withPath(file.getName()) | ||
| .build()) | ||
| .collect(Collectors.toList()); | ||
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| hadoopConfVolume = new VolumeBuilder() | ||
| .withName(Constants.HADOOP_CONF_VOLUME) | ||
| .withNewConfigMap() | ||
| .withName(getHadoopConfConfigMapName(kubernetesParameters.getClusterId())) | ||
| .withItems(keyToPaths) | ||
| .endConfigMap() | ||
| .build(); | ||
| } | ||
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| final Pod podWithHadoopConf = new PodBuilder(flinkPod.getPod()) | ||
| .editOrNewSpec() | ||
| .addNewVolumeLike(hadoopConfVolume) | ||
| .endVolume() | ||
| .endSpec() | ||
| .build(); | ||
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| final Container containerWithHadoopConf = new ContainerBuilder(flinkPod.getMainContainer()) | ||
| .addNewVolumeMount() | ||
| .withName(Constants.HADOOP_CONF_VOLUME) | ||
| .withMountPath(Constants.HADOOP_CONF_DIR_IN_POD) | ||
| .endVolumeMount() | ||
| .addNewEnv() | ||
| .withName(Constants.ENV_HADOOP_CONF_DIR) | ||
| .withValue(Constants.HADOOP_CONF_DIR_IN_POD) | ||
| .endEnv() | ||
| .build(); | ||
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| return new FlinkPod.Builder(flinkPod) | ||
| .withPod(podWithHadoopConf) | ||
| .withMainContainer(containerWithHadoopConf) | ||
| .build(); | ||
| } | ||
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| @Override | ||
| public List<HasMetadata> buildAccompanyingKubernetesResources() throws IOException { | ||
| if (kubernetesParameters.getExistingHadoopConfigurationConfigMap().isPresent()) { | ||
| return Collections.emptyList(); | ||
| } | ||
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| final Optional<String> localHadoopConfigurationDirectory = kubernetesParameters.getLocalHadoopConfigurationDirectory(); | ||
| if (!localHadoopConfigurationDirectory.isPresent()) { | ||
| return Collections.emptyList(); | ||
| } | ||
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| final List<File> hadoopConfigurationFileItems = getHadoopConfigurationFileItems(localHadoopConfigurationDirectory.get()); | ||
| if (hadoopConfigurationFileItems.isEmpty()) { | ||
| LOG.warn("Found 0 files in directory {}, skip to create the Hadoop Configuration ConfigMap.", localHadoopConfigurationDirectory.get()); | ||
| return Collections.emptyList(); | ||
| } | ||
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| final Map<String, String> data = new HashMap<>(); | ||
| for (File file: hadoopConfigurationFileItems) { | ||
| data.put(file.getName(), FileUtils.readFileUtf8(file)); | ||
| } | ||
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| final ConfigMap hadoopConfigMap = new ConfigMapBuilder() | ||
| .withApiVersion(Constants.API_VERSION) | ||
| .withNewMetadata() | ||
| .withName(getHadoopConfConfigMapName(kubernetesParameters.getClusterId())) | ||
| .withLabels(kubernetesParameters.getCommonLabels()) | ||
| .endMetadata() | ||
| .addToData(data) | ||
| .build(); | ||
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| return Collections.singletonList(hadoopConfigMap); | ||
| } | ||
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| private List<File> getHadoopConfigurationFileItems(String localHadoopConfigurationDirectory) { | ||
| final List<String> expectedFileNames = new ArrayList<>(); | ||
| expectedFileNames.add("core-site.xml"); | ||
| expectedFileNames.add("hdfs-site.xml"); | ||
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| final File directory = new File(localHadoopConfigurationDirectory); | ||
| if (directory.exists() && directory.isDirectory()) { | ||
| return Arrays.stream(directory.listFiles()) | ||
| .filter(file -> file.isFile() && expectedFileNames.stream().anyMatch(name -> file.getName().equals(name))) | ||
| .collect(Collectors.toList()); | ||
| } else { | ||
| return Collections.emptyList(); | ||
| } | ||
| } | ||
|
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| public static String getHadoopConfConfigMapName(String clusterId) { | ||
| return Constants.HADOOP_CONF_CONFIG_MAP_PREFIX + clusterId; | ||
| } | ||
| } |
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