org.cloudata.core.tablet.backup.RestoreJob.java Source code

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Here is the source code for org.cloudata.core.tablet.backup.RestoreJob.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.cloudata.core.tablet.backup;

import java.io.IOException;
import java.util.ArrayList;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.TextInputFormat;
import org.cloudata.core.client.CTable;
import org.cloudata.core.common.conf.CloudataConf;
import org.cloudata.core.fs.GPath;
import org.cloudata.core.parallel.hadoop.DefaultTabletInputFormat;
import org.cloudata.core.tablet.TableSchema;

/**
 * @author jindolk
 *
 */
public class RestoreJob {

    /**
     * @param string
     * @param string2
     * @param binary
     */
    public void runRestore(String tableName, String[] columnNames, int numOfVersion, String inputPath)
            throws IOException {
        CloudataConf nconf = new CloudataConf();

        JobConf partitionJob = new JobConf(RestoreJob.class);

        FileSystem fs = FileSystem.get(partitionJob);

        if (!fs.exists(new Path(inputPath))) {
            throw new IOException("input path not exists:" + inputPath);
        }

        if (CTable.existsTable(nconf, tableName)) {
            throw new IOException("table already exists" + tableName);
        }

        TableSchema tableSchema = new TableSchema(tableName, "", columnNames);
        tableSchema.setNumOfVersion(numOfVersion);
        CTable.createTable(nconf, tableSchema);

        String columns = "";
        for (String eachColumn : columnNames) {
            columns += eachColumn.trim() + ",";
        }
        columns = columns.substring(0, columns.length() - 1);

        String jobName = tableName + " restore";
        String tempDir = jobName + "_" + System.currentTimeMillis();

        partitionJob.setJobName(jobName + "_partition");

        partitionJob.setMapperClass(RestorePartitionMap.class);
        FileInputFormat.addInputPath(partitionJob, new Path(inputPath));
        partitionJob.setInputFormat(RestoreTextInputFormat.class);
        partitionJob.set(DefaultTabletInputFormat.OUTPUT_TABLE, tableName);
        FileOutputFormat.setOutputPath(partitionJob, new Path(tempDir));

        //map only
        partitionJob.setNumReduceTasks(0);

        JobClient.runJob(partitionJob);

        fs.delete(new Path(tempDir), true);
        ////////////////////////////////////////////////////////////

        JobConf jobConf = new JobConf(BackupJob.class);
        jobConf.setJobName(jobName);

        jobConf.setMapperClass(RestoreMap.class);
        FileInputFormat.addInputPath(jobConf, new Path(inputPath));
        jobConf.setInputFormat(RestoreTextInputFormat.class);
        jobConf.set(DefaultTabletInputFormat.OUTPUT_TABLE, tableName);
        jobConf.set(DefaultTabletInputFormat.INPUT_COLUMN_LIST, columns);
        FileOutputFormat.setOutputPath(jobConf, new Path(tempDir));
        jobConf.setMaxMapAttempts(0);

        //map only
        jobConf.setNumReduceTasks(0);

        JobClient.runJob(jobConf);
        //delete temp output dir
        fs.delete(new Path(tempDir), true);
    }

    /**
     * File 1? Map ???
     * @author jindolk
     *
     */
    static class RestoreTextInputFormat extends TextInputFormat {
        public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException {
            FileStatus[] files = listStatus(job);
            // generate splits
            ArrayList<FileSplit> splits = new ArrayList<FileSplit>(numSplits);
            for (int i = 0; i < files.length; i++) {
                FileStatus fileStatus = files[i];
                Path file = fileStatus.getPath();
                long length = fileStatus.getLen();
                if (length != 0) {
                    splits.add(new FileSplit(file, 0, length, (String[]) null));
                }
            }
            return splits.toArray(new FileSplit[splits.size()]);
        }
    }
}