com.cloudera.sqoop.mapreduce.MySQLDumpImportJob.java Source code

Introduction

Here is the source code for com.cloudera.sqoop.mapreduce.MySQLDumpImportJob.java

Source

/**
 * Licensed to Cloudera, Inc. under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  Cloudera, Inc. 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.cloudera.sqoop.mapreduce;

import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.db.DBWritable;

import com.cloudera.sqoop.SqoopOptions;
import com.cloudera.sqoop.manager.ConnManager;
import com.cloudera.sqoop.manager.ImportJobContext;
import com.cloudera.sqoop.manager.MySQLUtils;
import com.cloudera.sqoop.mapreduce.db.DBConfiguration;
import com.cloudera.sqoop.mapreduce.db.DataDrivenDBInputFormat;

/**
 * Class that runs an import job using mysqldump in the mapper.
 */
public class MySQLDumpImportJob extends ImportJobBase {

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

    public MySQLDumpImportJob(final SqoopOptions opts, ImportJobContext context) throws ClassNotFoundException {
        super(opts, MySQLDumpMapper.class, MySQLDumpInputFormat.class, RawKeyTextOutputFormat.class, context);
    }

    /**
     * Configure the inputformat to use for the job.
     */
    protected void configureInputFormat(Job job, String tableName, String tableClassName, String splitByCol)
            throws ClassNotFoundException, IOException {

        if (null == tableName) {
            LOG.error("mysqldump-based import cannot support free-form query imports.");
            LOG.error("Do not use --direct and --query together for MySQL.");
            throw new IOException("null tableName for MySQLDumpImportJob.");
        }

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

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

        String[] sqlColNames = null;
        if (null != colNames) {
            sqlColNames = new String[colNames.length];
            for (int i = 0; i < colNames.length; i++) {
                sqlColNames[i] = mgr.escapeColName(colNames[i]);
            }
        }

        // It's ok if the where clause is null in DBInputFormat.setInput.
        String whereClause = options.getWhereClause();

        // We can't set the class properly in here, because we may not have the
        // jar loaded in this JVM. So we start by calling setInput() with
        // DBWritable and then overriding the string manually.

        // Note that mysqldump also does *not* want a quoted table name.
        DataDrivenDBInputFormat.setInput(job, DBWritable.class, tableName, whereClause,
                mgr.escapeColName(splitByCol), sqlColNames);

        Configuration conf = job.getConfiguration();
        conf.setInt(MySQLUtils.OUTPUT_FIELD_DELIM_KEY, options.getOutputFieldDelim());
        conf.setInt(MySQLUtils.OUTPUT_RECORD_DELIM_KEY, options.getOutputRecordDelim());
        conf.setInt(MySQLUtils.OUTPUT_ENCLOSED_BY_KEY, options.getOutputEnclosedBy());
        conf.setInt(MySQLUtils.OUTPUT_ESCAPED_BY_KEY, options.getOutputEscapedBy());
        conf.setBoolean(MySQLUtils.OUTPUT_ENCLOSE_REQUIRED_KEY, options.isOutputEncloseRequired());
        String[] extraArgs = options.getExtraArgs();
        if (null != extraArgs) {
            conf.setStrings(MySQLUtils.EXTRA_ARGS_KEY, extraArgs);
        }

        LOG.debug("Using InputFormat: " + inputFormatClass);
        job.setInputFormatClass(getInputFormatClass());
    }

    /**
     * Set the mapper class implementation to use in the job,
     * as well as any related configuration (e.g., map output types).
     */
    protected void configureMapper(Job job, String tableName, String tableClassName)
            throws ClassNotFoundException, IOException {
        job.setMapperClass(getMapperClass());
        job.setOutputKeyClass(String.class);
        job.setOutputValueClass(NullWritable.class);
    }

}