org.apache.ambari.server.checks.ServicesYarnWorkPreservingCheck.java Source code

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Here is the source code for org.apache.ambari.server.checks.ServicesYarnWorkPreservingCheck.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.
 */
package org.apache.ambari.server.checks;

import java.util.Map;

import org.apache.ambari.server.AmbariException;
import org.apache.ambari.server.ServiceNotFoundException;
import org.apache.ambari.server.controller.PrereqCheckRequest;
import org.apache.ambari.server.state.Cluster;
import org.apache.ambari.server.state.Config;
import org.apache.ambari.server.state.DesiredConfig;
import org.apache.ambari.server.state.stack.PrereqCheckStatus;
import org.apache.ambari.server.state.stack.PrerequisiteCheck;
import org.apache.commons.lang.BooleanUtils;

/**
 * Checks that YARN has work-preserving restart enabled.
 */
public class ServicesYarnWorkPreservingCheck extends AbstractCheckDescriptor {

    /**
     * Constructor.
     */
    public ServicesYarnWorkPreservingCheck() {
        super(CheckDescription.SERVICES_YARN_WP);
    }

    @Override
    public boolean isApplicable(PrereqCheckRequest request) throws AmbariException {
        final Cluster cluster = clustersProvider.get().getCluster(request.getClusterName());
        try {
            cluster.getService("YARN");
        } catch (ServiceNotFoundException ex) {
            return false;
        }
        return true;
    }

    @Override
    public void perform(PrerequisiteCheck prerequisiteCheck, PrereqCheckRequest request) throws AmbariException {
        final String clusterName = request.getClusterName();
        final Cluster cluster = clustersProvider.get().getCluster(clusterName);
        final String configType = "yarn-site";
        final Map<String, DesiredConfig> desiredConfigs = cluster.getDesiredConfigs();
        final DesiredConfig desiredConfig = desiredConfigs.get(configType);
        final Config config = cluster.getConfig(configType, desiredConfig.getTag());
        if (!config.getProperties().containsKey("yarn.resourcemanager.work-preserving-recovery.enabled")
                || !BooleanUtils.toBoolean(
                        config.getProperties().get("yarn.resourcemanager.work-preserving-recovery.enabled"))) {
            prerequisiteCheck.getFailedOn().add("YARN");
            prerequisiteCheck.setStatus(PrereqCheckStatus.FAIL);
            prerequisiteCheck.setFailReason(getFailReason(prerequisiteCheck, request));
        }
    }
}