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", "colfam3", "colfam4");
System.out.println("Adding rows to table...");
helper.fillTable("testtable", 1, 10, 2, "colfam1", "colfam2", "colfam3", "colfam4");
HTable table = new HTable(conf, "testtable");
// vv FamilyFilterExample
Filter filter1 =
new FamilyFilter(
CompareFilter.CompareOp
.LESS, // co FamilyFilterExample-1-Filter Create filter, while specifying the
// comparison operator and comparator.
new BinaryComparator(Bytes.toBytes("colfam3")));
Scan scan = new Scan();
scan.setFilter(filter1);
ResultScanner scanner =
table.getScanner(
scan); // co FamilyFilterExample-2-Scan Scan over table while applying the filter.
// ^^ FamilyFilterExample
System.out.println("Scanning table... ");
// vv FamilyFilterExample
for (Result result : scanner) {
System.out.println(result);
}
scanner.close();
Get get1 = new Get(Bytes.toBytes("row-5"));
get1.setFilter(filter1);
Result result1 =
table.get(get1); // co FamilyFilterExample-3-Get Get a row while applying the same filter.
System.out.println("Result of get(): " + result1);
Filter filter2 =
new FamilyFilter(
CompareFilter.CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("colfam3")));
Get get2 =
new Get(
Bytes.toBytes(
"row-5")); // co FamilyFilterExample-4-Mismatch Create a filter on one column family
// while trying to retrieve another.
get2.addFamily(Bytes.toBytes("colfam1"));
get2.setFilter(filter2);
Result result2 =
table.get(
get2); // co FamilyFilterExample-5-Get2 Get the same row while applying the new filter,
// this will return "NONE".
System.out.println("Result of get(): " + result2);
// ^^ FamilyFilterExample
}
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");
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf("testtable"));
// vv SingleColumnValueFilterExample
SingleColumnValueFilter filter =
new SingleColumnValueFilter(
Bytes.toBytes("colfam1"),
Bytes.toBytes("col-5"),
CompareFilter.CompareOp.NOT_EQUAL,
new SubstringComparator("val-5"));
filter.setFilterIfMissing(true);
Scan scan = new Scan();
scan.setFilter(filter);
ResultScanner scanner = table.getScanner(scan);
// ^^ SingleColumnValueFilterExample
System.out.println("Results of scan:");
// vv SingleColumnValueFilterExample
for (Result result : scanner) {
for (Cell cell : result.rawCells()) {
System.out.println(
"Cell: "
+ cell
+ ", Value: "
+ Bytes.toString(
cell.getValueArray(), cell.getValueOffset(), cell.getValueLength()));
}
}
scanner.close();
Get get = new Get(Bytes.toBytes("row-6"));
get.setFilter(filter);
Result result = table.get(get);
System.out.println("Result of get: ");
for (Cell cell : result.rawCells()) {
System.out.println(
"Cell: "
+ cell
+ ", Value: "
+ Bytes.toString(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength()));
}
// ^^ SingleColumnValueFilterExample
}
public static void main(String[] args) throws IOException {
Configuration conf = HBaseConfiguration.create();
HBaseHelper helper = HBaseHelper.getHelper(conf);
helper.dropTable("testtable");
helper.createTable("testtable", "colfam1");
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf("testtable"));
List<Put> puts = new ArrayList<Put>();
// vv PutListErrorExample2
Put put1 = new Put(Bytes.toBytes("row1"));
put1.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"), Bytes.toBytes("val1"));
puts.add(put1);
Put put2 = new Put(Bytes.toBytes("row2"));
put2.addColumn(Bytes.toBytes("BOGUS"), Bytes.toBytes("qual1"), Bytes.toBytes("val2"));
puts.add(put2);
Put put3 = new Put(Bytes.toBytes("row2"));
put3.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual2"), Bytes.toBytes("val3"));
puts.add(put3);
/*[*/ Put put4 = new Put(Bytes.toBytes("row2"));
puts.add(
put4); /*]*/ // co PutListErrorExample2-1-AddErrorPut Add put with no content at all to
// list.
/*[*/ try {
/*]*/
table.put(puts);
/*[*/ } catch (Exception e) {
System.err.println("Error: " + e);
// table.flushCommits();
// todo: FIX!
/*]*/
// co PutListErrorExample2-2-Catch Catch local exception and commit queued updates.
/*[*/ } /*]*/
// ^^ PutListErrorExample2
table.close();
connection.close();
helper.close();
}
public static void main(String[] args) throws IOException, InterruptedException {
Configuration conf = HBaseConfiguration.create();
HBaseHelper helper = HBaseHelper.getHelper(conf);
helper.dropTable("testtable");
Connection connection = ConnectionFactory.createConnection(conf);
Admin admin = connection.getAdmin();
// vv CreateTableWithNamespaceExample
/*[*/ NamespaceDescriptor namespace = NamespaceDescriptor.create("testspace").build();
admin.createNamespace(namespace); /*]*/
TableName tableName = TableName.valueOf("testspace", "testtable");
HTableDescriptor desc = new HTableDescriptor(tableName);
HColumnDescriptor coldef = new HColumnDescriptor(Bytes.toBytes("colfam1"));
desc.addFamily(coldef);
admin.createTable(desc);
// ^^ CreateTableWithNamespaceExample
boolean avail = admin.isTableAvailable(tableName);
System.out.println("Table available: " + avail);
}
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();
}