Please find below a sample code which write to a kerberised HBase using keytab. package hbase;
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.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
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.client.Put;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.security.UserGroupInformation;
public class HBaseTest {
private static Configuration conf = null;
/**
* Initialization
*/
static {
conf = HBaseConfiguration.create();
conf.set("hadoop.security.authentication", "Kerberos");
}
/**
* Create a table
*/
public static void creatTable(String tableName, String[] familys)
throws Exception {
HBaseAdmin admin = new HBaseAdmin(conf);
if (admin.tableExists(tableName)) {
System.out.println("table already exists!");
} else {
HTableDescriptor tableDesc = new HTableDescriptor(tableName);
for (int i = 0; i < familys.length; i++) {
tableDesc.addFamily(new HColumnDescriptor(familys[i]));
}
admin.createTable(tableDesc);
System.out.println("create table " + tableName + " ok.");
}
}
/**
* Delete a table
*/
public static void deleteTable(String tableName) throws Exception {
try {
HBaseAdmin admin = new HBaseAdmin(conf);
admin.disableTable(tableName);
admin.deleteTable(tableName);
System.out.println("delete table " + tableName + " ok.");
} catch (MasterNotRunningException e) {
e.printStackTrace();
} catch (ZooKeeperConnectionException e) {
e.printStackTrace();
}
}
/**
* Put (or insert) a row
*/
public static void addRecord(String tableName, String rowKey,
String family, String qualifier, String value) throws Exception {
try {
HTable table = new HTable(conf, tableName);
Put put = new Put(Bytes.toBytes(rowKey));
put.add(Bytes.toBytes(family), Bytes.toBytes(qualifier), Bytes
.toBytes(value));
table.put(put);
System.out.println("insert recored " + rowKey + " to table "
+ tableName + " ok.");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Delete a row
*/
public static void delRecord(String tableName, String rowKey)
throws IOException {
HTable table = new HTable(conf, tableName);
List<Delete> list = new ArrayList<Delete>();
Delete del = new Delete(rowKey.getBytes());
list.add(del);
table.delete(list);
System.out.println("del recored " + rowKey + " ok.");
}
/**
* Get a row
*/
public static void getOneRecord (String tableName, String rowKey) throws IOException{
HTable table = new HTable(conf, tableName);
Get get = new Get(rowKey.getBytes());
Result rs = table.get(get);
for(KeyValue kv : rs.raw()){
System.out.print(new String(kv.getRow()) + " " );
System.out.print(new String(kv.getFamily()) + ":" );
System.out.print(new String(kv.getQualifier()) + " " );
System.out.print(kv.getTimestamp() + " " );
System.out.println(new String(kv.getValue()));
}
}
/**
* Scan (or list) a table
*/
public static void getAllRecord (String tableName) {
try{
HTable table = new HTable(conf, tableName);
Scan s = new Scan();
ResultScanner ss = table.getScanner(s);
for(Result r:ss){
for(KeyValue kv : r.raw()){
System.out.print(new String(kv.getRow()) + " ");
System.out.print(new String(kv.getFamily()) + ":");
System.out.print(new String(kv.getQualifier()) + " ");
System.out.print(kv.getTimestamp() + " ");
System.out.println(new String(kv.getValue()));
}
}
} catch (IOException e){
e.printStackTrace();
}
}
public static void main(String[] agrs) {
try {
String tablename = "scores";
String[] familys = { "grade", "course" };
if (!UserGroupInformation.isSecurityEnabled()) throw new IOException("Security is not enabled in core-site.xml");
try {
UserGroupInformation.setConfiguration(conf);
UserGroupInformation userGroupInformation = UserGroupInformation.loginUserFromKeytabAndReturnUGI("hbase-app@KRB.HDP", "/home/hbase-app/hbase-app.headless.keytab" );
UserGroupInformation.setLoginUser(userGroupInformation);
} catch(IOException e) {
e.printStackTrace();
}
HBaseTest.creatTable(tablename, familys);
// add record zkb
HBaseTest.addRecord(tablename, "zkb", "grade", "", "5");
HBaseTest.addRecord(tablename, "zkb", "course", "", "90");
HBaseTest.addRecord(tablename, "zkb", "course", "math", "97");
HBaseTest.addRecord(tablename, "zkb", "course", "art", "87");
// add record baoniu
HBaseTest.addRecord(tablename, "baoniu", "grade", "", "4");
HBaseTest.addRecord(tablename, "baoniu", "course", "math", "89");
System.out.println("===========get one record========");
HBaseTest.getOneRecord(tablename, "zkb");
System.out.println("===========show all record========");
HBaseTest.getAllRecord(tablename);
System.out.println("===========del one record========");
HBaseTest.delRecord(tablename, "baoniu");
HBaseTest.getAllRecord(tablename);
System.out.println("===========show all record========");
HBaseTest.getAllRecord(tablename);
} catch (Exception e) {
e.printStackTrace();
}
}
}
You can build / compile by doing From command line, please run to create the directory called 'bld': # mkdir bld From command line, please run to compile the 'HBaseTest.java' class into 'bld' directory: # javac -cp `hbase classpath` -d bld/ HBaseTest.java From command line, please run to package the compiled class into a jar file called 'HBaseTest.jar': # jar -cvf HBaseTest.jar -C bld/ . On the client side, from command line, please run the 'HBaseTest.jar' by using the 'hadoop jar' commands: # export HADOOP_CLASSPATH=`hbase classpath` # hadoop jar HBaseTest.jar hbase.HBaseTest NOTE: The source of the code above is based on the Hortonworks Developer class.
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