Example usage for org.apache.cassandra.dht Murmur3Partitioner Murmur3Partitioner

Introduction

In this page you can find the example usage for org.apache.cassandra.dht Murmur3Partitioner Murmur3Partitioner.

Prototype

Murmur3Partitioner

Source Link

Usage

From source file:test.GenSstable.java

License:Apache License

public static void main(String[] args) {
    if (args.length != 4) {
        System.out.println("usage: java test.gendata tablename no_years no_pnodes no_prices");
        return;// w ww .  j a v a 2  s . co  m
    }

    String tblname = args[0];
    int yearsNb = Integer.parseInt(args[1]);
    int pnodesNb = Integer.parseInt(args[2]);
    int pricesNb = Integer.parseInt(args[3]);

    // magic!
    Config.setClientMode(true);

    String dir = DEFAULT_OUTPUT_DIR;
    // Create output directory that has keyspace and table name in the path
    File outputDir = new File(dir + File.separator + KEYSPACE + File.separator + tblname);
    if (!outputDir.exists() && !outputDir.mkdirs()) {
        throw new RuntimeException("Cannot create output directory: " + outputDir);
    }

    // Prepare SSTable writer
    CQLSSTableWriter.Builder builder = CQLSSTableWriter.builder();
    // set output directory
    builder.inDirectory(outputDir)
            // set target schema
            .forTable(getSchema(tblname, pricesNb))
            // set CQL statement to put data
            .using(createInsertStatement(tblname, pricesNb))
            // set partitioner if needed
            // default is Murmur3Partitioner so set if you use different one.
            .withPartitioner(new Murmur3Partitioner());
    CQLSSTableWriter writer = builder.build();

    Collection<String> names = generateNames(pnodesNb);
    SortedSet<Date> dates = generateDates(yearsNb);

    try {
        for (String name : names) {
            System.out.println("Inserting values for " + name + "...");
            for (Date date : dates) {
                List<Object> values = new ArrayList<>();

                values.add(name);
                values.add(date);
                values.addAll(generatePrices(pricesNb));

                writer.addRow(values);
            }
        }
    } catch (IOException | InvalidRequestException e) {
        e.printStackTrace();
    } finally {
        try {
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    System.out.println("Done generating sstable.");
}

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