/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.kylin.storage.hbase; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.client.HConnection; import org.apache.hadoop.hbase.client.HConnectionManager; import org.apache.hadoop.hbase.client.HTableInterface; 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.security.User; import org.apache.hadoop.hbase.security.token.TokenUtil; import org.apache.hadoop.hbase.util.Bytes; import org.apache.hadoop.security.UserGroupInformation; import org.apache.kylin.common.util.HadoopUtil; /** * @author yangli9 * */ public class PingHBaseCLI { public static void main(String[] args) throws IOException { String metadataUrl = args[0]; String hbaseTable = args[1]; System.out.println("Hello friend."); Configuration hconf = HadoopUtil.newHBaseConfiguration(metadataUrl); if (User.isHBaseSecurityEnabled(hconf)) { try { System.out.println("--------------Getting kerberos credential for user " + UserGroupInformation.getCurrentUser().getUserName()); TokenUtil.obtainAndCacheToken(hconf, UserGroupInformation.getCurrentUser()); } catch (InterruptedException e) { System.out.println("--------------Error while getting kerberos credential for user " + UserGroupInformation.getCurrentUser().getUserName()); } } Scan scan = new Scan(); int limit = 20; HConnection conn = null; HTableInterface table = null; ResultScanner scanner = null; try { conn = HConnectionManager.createConnection(hconf); table = conn.getTable(hbaseTable); scanner = table.getScanner(scan); int count = 0; for (Result r : scanner) { byte[] rowkey = r.getRow(); System.out.println(Bytes.toStringBinary(rowkey)); count++; if (count == limit) break; } } finally { if (scanner != null) { scanner.close(); } if (table != null) { table.close(); } if (conn != null) { conn.close(); } } } }