org.apache.sqoop.mapreduce.JdbcExportJob.java Source code

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Here is the source code for org.apache.sqoop.mapreduce.JdbcExportJob.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.sqoop.mapreduce;

import java.io.IOException;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.DefaultStringifier;
import org.apache.hadoop.io.MapWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.sqoop.mapreduce.hcat.SqoopHCatUtilities;
import com.cloudera.sqoop.manager.ConnManager;
import com.cloudera.sqoop.manager.ExportJobContext;
import com.cloudera.sqoop.mapreduce.ExportJobBase;
import com.cloudera.sqoop.mapreduce.db.DBConfiguration;
import com.cloudera.sqoop.mapreduce.db.DBOutputFormat;

/**
 * Run an export using JDBC (JDBC-based ExportOutputFormat).
 */
public class JdbcExportJob extends ExportJobBase {

    private FileType fileType;

    public static final Log LOG = LogFactory.getLog(JdbcExportJob.class.getName());

    public JdbcExportJob(final ExportJobContext context) {
        super(context);
    }

    public JdbcExportJob(final ExportJobContext ctxt, final Class<? extends Mapper> mapperClass,
            final Class<? extends InputFormat> inputFormatClass,
            final Class<? extends OutputFormat> outputFormatClass) {
        super(ctxt, mapperClass, inputFormatClass, outputFormatClass);
    }

    @Override
    protected void configureInputFormat(Job job, String tableName, String tableClassName, String splitByCol)
            throws ClassNotFoundException, IOException {

        fileType = getInputFileType();

        super.configureInputFormat(job, tableName, tableClassName, splitByCol);

        if (isHCatJob) {
            SqoopHCatUtilities.configureExportInputFormat(options, job, context.getConnManager(), tableName,
                    job.getConfiguration());
            return;
        } else if (fileType == FileType.AVRO_DATA_FILE) {
            LOG.debug("Configuring for Avro export");
            ConnManager connManager = context.getConnManager();
            Map<String, Integer> columnTypeInts;
            if (options.getCall() == null) {
                columnTypeInts = connManager.getColumnTypes(tableName, options.getSqlQuery());
            } else {
                columnTypeInts = connManager.getColumnTypesForProcedure(options.getCall());
            }
            MapWritable columnTypes = new MapWritable();
            for (Map.Entry<String, Integer> e : columnTypeInts.entrySet()) {
                Text columnName = new Text(e.getKey());
                Text columnText = new Text(connManager.toJavaType(tableName, e.getKey(), e.getValue()));
                columnTypes.put(columnName, columnText);
            }
            DefaultStringifier.store(job.getConfiguration(), columnTypes, AvroExportMapper.AVRO_COLUMN_TYPES_MAP);
        }

    }

    @Override
    protected Class<? extends InputFormat> getInputFormatClass() throws ClassNotFoundException {
        if (isHCatJob) {
            return SqoopHCatUtilities.getInputFormatClass();
        }
        if (fileType == FileType.AVRO_DATA_FILE) {
            return AvroInputFormat.class;
        }
        return super.getInputFormatClass();
    }

    @Override
    protected Class<? extends Mapper> getMapperClass() {
        if (isHCatJob) {
            return SqoopHCatUtilities.getExportMapperClass();
        }
        switch (fileType) {
        case SEQUENCE_FILE:
            return SequenceFileExportMapper.class;
        case AVRO_DATA_FILE:
            return AvroExportMapper.class;
        case UNKNOWN:
        default:
            return TextExportMapper.class;
        }
    }

    @Override
    protected void configureOutputFormat(Job job, String tableName, String tableClassName) throws IOException {

        ConnManager mgr = context.getConnManager();
        try {
            String username = options.getUsername();
            if (null == username || username.length() == 0) {
                DBConfiguration.configureDB(job.getConfiguration(), mgr.getDriverClass(),
                        options.getConnectString(), options.getConnectionParams());
            } else {
                DBConfiguration.configureDB(job.getConfiguration(), mgr.getDriverClass(),
                        options.getConnectString(), username, options.getPassword(), options.getConnectionParams());
            }

            String[] colNames = options.getColumns();
            if (null == colNames) {
                colNames = mgr.getColumnNames(tableName);
            }

            if (mgr.escapeTableNameOnExport()) {
                DBOutputFormat.setOutput(job, mgr.escapeTableName(tableName), colNames);
            } else {
                DBOutputFormat.setOutput(job, tableName, colNames);
            }

            job.setOutputFormatClass(getOutputFormatClass());
            job.getConfiguration().set(SQOOP_EXPORT_TABLE_CLASS_KEY, tableClassName);
        } catch (ClassNotFoundException cnfe) {
            throw new IOException("Could not load OutputFormat", cnfe);
        }
    }

}