examples/spark/src/main/java/org/apache/carbondata/examples/sdk/SDKS3Example.java

/*
 * 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.carbondata.examples.sdk;

import org.apache.carbondata.common.logging.LogServiceFactory;
import org.apache.carbondata.core.constants.CarbonLoadOptionConstants;
import org.apache.carbondata.core.metadata.datatype.DataTypes;
import org.apache.carbondata.core.metadata.datatype.Field;
import org.apache.carbondata.core.scan.expression.ColumnExpression;
import org.apache.carbondata.core.scan.expression.LiteralExpression;
import org.apache.carbondata.core.scan.expression.conditional.EqualToExpression;
import org.apache.carbondata.core.util.CarbonProperties;
import org.apache.carbondata.sdk.file.CarbonReader;
import org.apache.carbondata.sdk.file.CarbonWriter;
import org.apache.carbondata.sdk.file.Schema;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.s3a.Constants;
import org.apache.log4j.Logger;

import static org.apache.hadoop.fs.s3a.Constants.ACCESS_KEY;
import static org.apache.hadoop.fs.s3a.Constants.ENDPOINT;
import static org.apache.hadoop.fs.s3a.Constants.SECRET_KEY;

/**
 * Example for testing CarbonWriter on S3
 */
public class SDKS3Example {
  public static void main(String[] args) throws Exception {
    Logger logger = LogServiceFactory.getLogService(SDKS3Example.class.getName());
    if (args == null || args.length < 3) {
      logger.error("Usage: java CarbonS3Example: <access-key> <secret-key>"
          + "<s3-endpoint> [table-path-on-s3] [rows] [Number of writes]");
      System.exit(0);
    }

    String backupProperty = CarbonProperties.getInstance().getProperty(
        CarbonLoadOptionConstants.ENABLE_CARBON_LOAD_DIRECT_WRITE_TO_STORE_PATH,
        CarbonLoadOptionConstants.ENABLE_CARBON_LOAD_DIRECT_WRITE_TO_STORE_PATH_DEFAULT);
    CarbonProperties.getInstance().addProperty(
        CarbonLoadOptionConstants.ENABLE_CARBON_LOAD_DIRECT_WRITE_TO_STORE_PATH, "true");

    String path = "s3a://sdk/WriterOutput";
    if (args.length > 3) {
      path = args[3];
    }

    int rows = 3;
    if (args.length > 4) {
      rows = Integer.parseInt(args[4]);
    }
    int num = 3;
    if (args.length > 5) {
      num = Integer.parseInt(args[5]);
    }

    Configuration conf = new Configuration(true);
    conf.set(Constants.ACCESS_KEY, args[0]);
    conf.set(Constants.SECRET_KEY, args[1]);
    conf.set(Constants.ENDPOINT, args[2]);

    Field[] fields = new Field[2];
    fields[0] = new Field("name", DataTypes.STRING);
    fields[1] = new Field("age", DataTypes.INT);
    for (int j = 0; j < num; j++) {
      CarbonWriter writer = CarbonWriter.builder().outputPath(path).withHadoopConf(conf)
          .withCsvInput(new Schema(fields)).writtenBy("SDKS3Example").build();

      for (int i = 0; i < rows; i++) {
        writer.write(new String[] { "robot" + (i % 10), String.valueOf(i) });
      }
      writer.close();
    }
    // Read data

    EqualToExpression equalToExpression = new EqualToExpression(
        new ColumnExpression("name", DataTypes.STRING),
        new LiteralExpression("robot1", DataTypes.STRING));

    CarbonReader reader = CarbonReader.builder(path, "_temp").projection(
        new String[] { "name", "age" }).filter(equalToExpression).withHadoopConf(conf).build();

    System.out.println("\nData:");
    int i = 0;
    while (i < 20 && reader.hasNext()) {
      Object[] row = (Object[]) reader.readNextRow();
      System.out.println(row[0] + " " + row[1]);
      i++;
    }
    System.out.println("\nFinished");
    reader.close();

    // Read without filter
    CarbonReader reader2 = CarbonReader.builder(path, "_temp").projection(
        new String[] { "name", "age" }).withHadoopConf(ACCESS_KEY, args[0]).withHadoopConf(
        SECRET_KEY, args[1]).withHadoopConf(ENDPOINT, args[2]).build();

    System.out.println("\nData:");
    i = 0;
    while (i < 20 && reader2.hasNext()) {
      Object[] row = (Object[]) reader2.readNextRow();
      System.out.println(row[0] + " " + row[1]);
      i++;
    }
    System.out.println("\nFinished");
    reader2.close();

    CarbonProperties.getInstance().addProperty(
        CarbonLoadOptionConstants.ENABLE_CARBON_LOAD_DIRECT_WRITE_TO_STORE_PATH, backupProperty);
  }
}