package filters;
// cc TimestampFilterExample Example filtering data by timestamps
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.HTable;
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.filter.Filter;
import org.apache.hadoop.hbase.filter.TimestampsFilter;
import util.HBaseHelper;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
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");
HTable table = new HTable(conf, "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
}
}