public static void main(String[] args) throws IOException {
Configuration conf = HBaseConfiguration.create();
conf.set(
"hbase.zookeeper.quorum",
"master-1.internal.larsgeorge.com,"
+ "master-2.internal.larsgeorge.com,master-3.internal.larsgeorge.com");
HBaseHelper helper = HBaseHelper.getHelper(conf);
helper.dropTable("testtable");
helper.createTable("testtable", "colfam1");
System.out.println("Adding rows to table...");
helper.fillTable("testtable", 1, 5, 1, "colfam1");
System.out.println("Table before the operations:");
helper.dump("testtable");
Connection connection = ConnectionFactory.createConnection(conf);
TableName tableName = TableName.valueOf("testtable");
Table table = connection.getTable(tableName);
// vv ScanConsistencyExample1
Scan scan = new Scan();
scan.setCaching(
1); // co ScanConsistencyExample1-1-ConfScan Configure scan to iterate over each row
// separately.
ResultScanner scanner = table.getScanner(scan);
// ^^ ScanConsistencyExample1
System.out.println("Starting scan, reading one row...");
// vv ScanConsistencyExample1
Result result = scanner.next();
helper.dumpResult(result);
// ^^ ScanConsistencyExample1
System.out.println("Applying mutations...");
// vv ScanConsistencyExample1
Put put = new Put(Bytes.toBytes("row-3"));
put.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("col-1"), Bytes.toBytes("val-999"));
table.put(put); // co ScanConsistencyExample1-2-Put Update a later row with a new value.
Delete delete = new Delete(Bytes.toBytes("row-4"));
table.delete(
delete); // co ScanConsistencyExample1-3-Delete Remove an entire row, that is located at the
// end of the scan.
// ^^ ScanConsistencyExample1
System.out.println("Resuming original scan...");
// vv ScanConsistencyExample1
for (Result result2 : scanner) {
helper.dumpResult(
result2); // co ScanConsistencyExample1-4-Scan Scan the rest of the table to see if the
// mutations are visible.
}
scanner.close();
// ^^ ScanConsistencyExample1
System.out.println("Print table under new scanner...");
// vv ScanConsistencyExample1
helper.dump(
"testtable"); // co ScanConsistencyExample1-5-Dump Print the entire table again, with a new
// scanner instance.
// ^^ ScanConsistencyExample1
table.close();
connection.close();
helper.close();
}
