org.cloudata.core.testjob.tera.TeraScanJob.java Source code

Introduction

Here is the source code for org.cloudata.core.testjob.tera.TeraScanJob.java

Source

/**
 * 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.testjob.tera;

import java.io.IOException;
import java.io.InputStream;
import java.util.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.cloudata.core.client.CellFilter;
import org.cloudata.core.client.CTable;
import org.cloudata.core.client.RowFilter;
import org.cloudata.core.common.conf.CloudataConf;
import org.cloudata.core.common.util.FileUtil;
import org.cloudata.core.parallel.hadoop.AbstractTabletInputFormat;
import org.cloudata.core.parallel.hadoop.DefaultTabletInputFormat;
import org.cloudata.core.parallel.hadoop.InputTableInfo;

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

    public void runJob(String tableName) throws IOException {
        JobConf jobConf = new JobConf(TeraScanJob.class);

        CloudataConf nconf = new CloudataConf();

        if (!CTable.existsTable(nconf, tableName)) {
            System.out.println("No table:" + tableName);
            System.exit(0);
        }
        Path tempOutputPath = new Path("TeraScanJob" + System.currentTimeMillis());

        jobConf.setJobName("TeraScanJob" + "(" + new Date() + ")");

        //<MAP>
        jobConf.setMapperClass(TeraScanMap.class);
        jobConf.setInputFormat(TeraScanJobTabletInputFormat.class);
        jobConf.set(AbstractTabletInputFormat.INPUT_TABLE, tableName);
        jobConf.setMapSpeculativeExecution(false);
        jobConf.setMaxMapAttempts(0);
        //</MAP>

        //<REDUCE>
        //    jobConf.setReducerClass(DocFreqReduce.class);
        //    jobConf.setOutputKeyClass(Text.class);
        //    jobConf.setOutputValueClass(Text.class);    
        FileOutputFormat.setOutputPath(jobConf, tempOutputPath);
        jobConf.setNumReduceTasks(0);
        //</REDUCE>

        //Run Job
        JobClient.runJob(jobConf);

        //    //delete temp output path
        FileSystem fs = FileSystem.get(jobConf);
        FileUtil.delete(fs, tempOutputPath, true);
    }

    static class TeraScanJobTabletInputFormat extends AbstractTabletInputFormat {
        public TeraScanJobTabletInputFormat() throws IOException {
            super();
        }

        @Override
        public InputTableInfo[] getInputTableInfos(JobConf jobConf) {
            String tableName = jobConf.get(DefaultTabletInputFormat.INPUT_TABLE);
            RowFilter rowFilter = new RowFilter();
            rowFilter.addCellFilter(new CellFilter("Col1"));

            InputTableInfo inputTableInfo = new InputTableInfo();
            inputTableInfo.setTable(tableName, rowFilter);

            return new InputTableInfo[] { inputTableInfo };
        }
    }

    static class TeraScanMap implements Mapper<WritableComparable, Writable, WritableComparable, Writable> {
        int count = 0;

        public void map(WritableComparable key, Writable value,
                OutputCollector<WritableComparable, Writable> collector, Reporter reporter) throws IOException {
            count++;
        }

        public void configure(JobConf jobConf) {
        }

        public void close() throws IOException {
            LOG.info("Scaned count:" + count);
            Configuration conf = new Configuration();
            FileSystem fs = FileSystem.get(conf);
            try {
                InputStream in = fs.open(new Path("/user/grid/khj/build.xml"));
                byte[] b = new byte[100];
                in.read(b);
                LOG.info("Read:" + new String(b));
                in.close();
            } catch (Exception e) {
                LOG.error(e.getMessage(), e);
            }
        }
    }

    public static void main(String[] args) throws IOException {
        if (args.length < 1) {
            System.out.println("Usage: java TeraScanJob <table name>");
            System.exit(0);
        }

        TeraScanJob job = new TeraScanJob();
        job.runJob(args[0]);
    }
}