org.apache.hive.hcatalog.templeton.StatusDelegator.java Source code

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Here is the source code for org.apache.hive.hcatalog.templeton.StatusDelegator.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.hive.hcatalog.templeton;

import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.shims.HadoopShims.WebHCatJTShim;
import org.apache.hadoop.hive.shims.ShimLoader;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.mapred.JobID;
import org.apache.hadoop.mapred.JobProfile;
import org.apache.hadoop.mapred.JobStatus;
import org.apache.hive.hcatalog.templeton.tool.JobState;

/**
 * Fetch the status of a given job id in the queue. There are three sources of the info
 * 1. Query result from JobTracker
 * 2. JobState saved by TempletonControllerJob when monitoring the TempletonControllerJob
 * 3. TempletonControllerJob put a JobState for every job it launches, so child job can
 *    retrieve its parent job by its JobState
 * 
 * Currently there is no permission restriction, any user can query any job
 */
public class StatusDelegator extends TempletonDelegator {
    private static final Log LOG = LogFactory.getLog(StatusDelegator.class);

    public StatusDelegator(AppConfig appConf) {
        super(appConf);
    }

    public QueueStatusBean run(String user, String id)
            throws NotAuthorizedException, BadParam, IOException, InterruptedException {
        WebHCatJTShim tracker = null;
        JobState state = null;
        try {
            UserGroupInformation ugi = UgiFactory.getUgi(user);
            tracker = ShimLoader.getHadoopShims().getWebHCatShim(appConf, ugi);
            JobID jobid = StatusDelegator.StringToJobID(id);
            if (jobid == null)
                throw new BadParam("Invalid jobid: " + id);
            state = new JobState(id, Main.getAppConfigInstance());
            return StatusDelegator.makeStatus(tracker, jobid, state);
        } catch (IllegalStateException e) {
            throw new BadParam(e.getMessage());
        } finally {
            if (tracker != null)
                tracker.close();
            if (state != null)
                state.close();
        }
    }

    static QueueStatusBean makeStatus(WebHCatJTShim tracker, JobID jobid, JobState state)
            throws BadParam, IOException {

        JobStatus status = tracker.getJobStatus(jobid);
        JobProfile profile = tracker.getJobProfile(jobid);
        if (status == null || profile == null) // No such job.
            throw new BadParam("Could not find job " + jobid);

        return new QueueStatusBean(state, status, profile);
    }

    /**
     * A version of JobID.forName with our app specific error handling.
     */
    public static JobID StringToJobID(String id) throws BadParam {
        try {
            return JobID.forName(id);
        } catch (IllegalArgumentException e) {
            throw new BadParam(e.getMessage());
        }
    }
}