TimestampFilterExample.java

package filters;

// cc TimestampFilterExample Example filtering data by timestamps
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.TimestampsFilter;

import util.HBaseHelper;

public class TimestampFilterExample {

  public static void main(String[] args) throws IOException {
    Configuration conf = HBaseConfiguration.create();

    HBaseHelper helper = HBaseHelper.getHelper(conf);
    helper.dropTable("testtable");
    helper.createTable("testtable", "colfam1");
    System.out.println("Adding rows to table...");
    helper.fillTable("testtable", 1, 100, 20, true, "colfam1");

    Connection connection = ConnectionFactory.createConnection(conf);
    Table table = connection.getTable(TableName.valueOf("testtable"));
    // vv TimestampFilterExample
    List<Long> ts = new ArrayList<Long>();
    ts.add(new Long(5));
    ts.add(new Long(10)); // co TimestampFilterExample-1-AddTS Add timestamps to the list.
    ts.add(new Long(15));
    Filter filter = new TimestampsFilter(ts);

    Scan scan1 = new Scan();
    scan1.setFilter(filter); // co TimestampFilterExample-2-AddFilter Add the filter to an otherwise default Scan instance.
    ResultScanner scanner1 = table.getScanner(scan1);
    // ^^ TimestampFilterExample
    System.out.println("Results of scan #1:");
    // vv TimestampFilterExample
    for (Result result : scanner1) {
      System.out.println(result);
    }
    scanner1.close();

    Scan scan2 = new Scan();
    scan2.setFilter(filter);
    scan2.setTimeRange(8, 12); // co TimestampFilterExample-3-AddTSRange Also add a time range to verify how it affects the filter
    ResultScanner scanner2 = table.getScanner(scan2);
    // ^^ TimestampFilterExample
    System.out.println("Results of scan #2:");
    // vv TimestampFilterExample
    for (Result result : scanner2) {
      System.out.println(result);
    }
    scanner2.close();
    // ^^ TimestampFilterExample
  }
}