Example usage for org.apache.hadoop.fs.s3a Constants ACCESS_KEY

Introduction

In this page you can find the example usage for org.apache.hadoop.fs.s3a Constants ACCESS_KEY.

Prototype

String ACCESS_KEY

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Usage

From source file:org.apache.carbondata.examples.sdk.SDKS3Example.java

License:Apache License

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);//from  w  ww.ja  va 2 s .  co m
    }

    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);
}

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