co.cask.hydrator.common.batch.JobUtils.java Source code

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Here is the source code for co.cask.hydrator.common.batch.JobUtils.java

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/*
 * Copyright  2016 Cask Data, Inc.
 *
 * 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 co.cask.hydrator.common.batch;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.UserGroupInformation;

import java.io.IOException;

/**
 * A utility for providing operations on {@link Job}.
 */
public final class JobUtils {

    /**
     * Creates a new instance of {@link Job}. Note that the job created is not meant for actual MR
     * submission. It's just for setting up configurations.
     */
    public static Job createInstance() throws IOException {
        Job job = Job.getInstance();
        Configuration conf = job.getConfiguration();
        conf.clear();

        if (UserGroupInformation.isSecurityEnabled()) {
            // If runs in secure cluster, this program runner is running in a yarn container, hence not able
            // to get authenticated with the history.
            conf.unset("mapreduce.jobhistory.address");
            conf.setBoolean(Job.JOB_AM_ACCESS_DISABLED, false);

            Credentials credentials = UserGroupInformation.getCurrentUser().getCredentials();
            job.getCredentials().addAll(credentials);
        }

        return job;
    }

    private JobUtils() {
        // no-op
    }
}