org.springframework.yarn.examples.FailingContextContainer.java Source code

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Here is the source code for org.springframework.yarn.examples.FailingContextContainer.java

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/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed 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.springframework.yarn.examples;

import java.util.Map.Entry;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.util.ConverterUtils;
import org.springframework.yarn.YarnSystemConstants;
import org.springframework.yarn.container.AbstractYarnContainer;
import org.springframework.yarn.container.YarnContainer;

/**
 * Simple {@link YarnContainer} example which is able
 * to exist with error status to demonstrate how it is
 * handled on Application Master.
 *
 * @author Janne Valkealahti
 *
 */
public class FailingContextContainer extends AbstractYarnContainer {

    private static final Log log = LogFactory.getLog(FailingContextContainer.class);

    @Override
    protected void runInternal() {
        log.info("Hello from FailingContextContainer");

        log.info("container parameters:");
        for (Entry<Object, Object> entry : getParameters().entrySet()) {
            log.info("key=" + entry.getKey() + ", value=" + entry.getValue());
        }

        log.info("container environment:");
        for (Entry<String, String> entry : getEnvironment().entrySet()) {
            log.info("key=" + entry.getKey() + ", value=" + entry.getValue());
        }

        ContainerId cid = ConverterUtils.toContainerId(getEnvironment(YarnSystemConstants.SYARN_CONTAINER_ID));
        int containerId = cid.getId();

        // We just use the container id found from token variable
        // to fail every other container.
        if ((containerId % 2) == 0) {
            log.info("Exiting with error");
            System.exit(1);
        } else {
            log.info("Exiting with ok");
            System.exit(0);
        }
    }

}