com.chinamobile.bcbsp.fault.storage.AggValueCheckpoint.java Source code

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Here is the source code for com.chinamobile.bcbsp.fault.storage.AggValueCheckpoint.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 com.chinamobile.bcbsp.fault.storage;

import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.ReflectionUtils;

import com.chinamobile.bcbsp.Constants;
import com.chinamobile.bcbsp.bspstaff.Staff;
import com.chinamobile.bcbsp.io.OutputFormat;
import com.chinamobile.bcbsp.io.RecordWriter;
import com.chinamobile.bcbsp.util.BSPJob;

/**
 * a AggValueCheckpoint is used to backup the aggValues during the local compute
 * @author Feng
 */
public class AggValueCheckpoint {
    /**handle log file in the class*/
    private static final Log LOG = LogFactory.getLog(AggValueCheckpoint.class);

    /**AggValueCheckpoint construct method
     * @param job
     *        job's aggregate values to write.
     */
    public AggValueCheckpoint(BSPJob job) {
    }

    /**
     * write the aggVlaues of staffs during local compute.
     * @param aggValues
     *        aggregate values
     * @param writeAggPath
     *        aggregate values write path.
     * @param job
     *        job to write
     * @param staff
     *        staff aggregate values to write
     * @return write result.
     * @throws IOException exceptions during write into hdfs.
     */
    public boolean writeAggCheckPoint(String aggValues, Path writeAggPath, BSPJob job, Staff staff)
            throws IOException {
        LOG.info("The aggValue Checkpoint write path is : " + writeAggPath.toString());
        try {
            OutputFormat outputformat = (OutputFormat) ReflectionUtils.newInstance(
                    job.getConf().getClass(Constants.USER_BC_BSP_JOB_OUTPUT_FORMAT_CLASS, OutputFormat.class),
                    job.getConf());
            outputformat.initialize(job.getConf());
            RecordWriter output = outputformat.getRecordWriter(job, staff.getStaffAttemptId(), writeAggPath);
            output.write(new Text(Constants.SSC_SPLIT_FLAG), new Text(aggValues));
            output.close(job);
        } catch (Exception e) {
            LOG.error("Exception has happened and been catched!", e);
            return false;
        }
        return true;
    }
}