| /** |
| * 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 org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.RecordWriter; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.sqoop.lib.SqoopRecord; |
| import org.apache.sqoop.mapreduce.db.DBConfiguration; |
| |
| /** |
| * Update an existing table of data with new value data. |
| * This requires a designated 'key column' for the WHERE clause |
| * of an UPDATE statement. |
| * |
| * The number of records per transaction is governed by the |
| * sqoop.export.records.per.statement configuration value or else default |
| * value is used |
| * |
| * Record objects are buffered before actually performing the UPDATE |
| * statements; this requires that the key implement the |
| * SqoopRecord interface. |
| */ |
| public class SQLServerResilientUpdateOutputFormat<K extends SqoopRecord, V> |
| extends SQLServerResilientExportOutputFormat<K, V> { |
| |
| private static final Log LOG = LogFactory.getLog( |
| SQLServerResilientUpdateOutputFormat.class); |
| |
| @Override |
| /** {@inheritDoc} */ |
| public void checkOutputSpecs(JobContext context) |
| throws IOException, InterruptedException { |
| Configuration conf = context.getConfiguration(); |
| DBConfiguration dbConf = new DBConfiguration(conf); |
| |
| // Sanity check all the configuration values we need. |
| if (null == conf.get(DBConfiguration.URL_PROPERTY)) { |
| throw new IOException("Database connection URL is not set."); |
| } else if (null == dbConf.getOutputTableName()) { |
| throw new IOException("Table name is not set for export."); |
| } else if (null == dbConf.getOutputFieldNames()) { |
| throw new IOException( |
| "Output field names are null."); |
| } else if (null == conf.get(ExportJobBase.SQOOP_EXPORT_UPDATE_COL_KEY)) { |
| throw new IOException("Update key column is not set for export."); |
| } |
| } |
| |
| @Override |
| /** {@inheritDoc} */ |
| public RecordWriter<K, V> getRecordWriter(TaskAttemptContext context) |
| throws IOException { |
| try { |
| return new SQLServerUpdateRecordWriter(context); |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| |
| /** |
| * RecordWriter to write the output to UPDATE statements modifying rows |
| * in the database. |
| * The actual database updates are executed in a parallel thread in a |
| * resilient fashion which attempts to recover failed operations |
| */ |
| public class SQLServerUpdateRecordWriter<K extends SqoopRecord, V> |
| extends SQLServerExportRecordWriter<K, V> { |
| |
| private final Log LOG = LogFactory.getLog( |
| SQLServerUpdateRecordWriter.class); |
| |
| public SQLServerUpdateRecordWriter(TaskAttemptContext context) |
| throws IOException { |
| super(context); |
| } |
| |
| /** |
| * Initialize the thread used to perform the asynchronous DB operation |
| */ |
| protected void initializeExecThread() throws IOException { |
| execThread = new SQLServerUpdateDBExecThread(); |
| execThread.initialize(conf); |
| } |
| } |
| } |