package client;
// cc ScanTimeoutExample Example timeout while using a scanner
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
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 util.HBaseHelper;
import java.io.IOException;
public class ScanTimeoutExample {
public static void main(String[] args) throws IOException {
Configuration conf = HBaseConfiguration.create();
HBaseHelper helper = HBaseHelper.getHelper(conf);
helper.dropTable("testtable");
helper.createTable("testtable", "colfam1", "colfam2");
System.out.println("Adding rows to table...");
helper.fillTable("testtable", 1, 10, 10, "colfam1", "colfam2");
HTable table = new HTable(conf, "testtable");
// vv ScanTimeoutExample
Scan scan = new Scan();
ResultScanner scanner = table.getScanner(scan);
int scannerTimeout = (int) conf.getLong(
HConstants.HBASE_REGIONSERVER_LEASE_PERIOD_KEY, -1); // co ScanTimeoutExample-1-GetConf Get currently configured lease timeout.
// ^^ ScanTimeoutExample
System.out.println("Current (local) lease period: " + scannerTimeout + "ms");
System.out.println("Sleeping now for " + (scannerTimeout + 5000) + "ms...");
// vv ScanTimeoutExample
try {
Thread.sleep(scannerTimeout + 5000); // co ScanTimeoutExample-2-Sleep Sleep a little longer than the lease allows.
} catch (InterruptedException e) {
// ignore
}
// ^^ ScanTimeoutExample
System.out.println("Attempting to iterate over scanner...");
// vv ScanTimeoutExample
while (true){
try {
Result result = scanner.next();
if (result == null) break;
System.out.println(result); // co ScanTimeoutExample-3-Dump Print row content.
} catch (Exception e) {
e.printStackTrace();
break;
}
}
scanner.close();
// ^^ ScanTimeoutExample
}
}