HBase-java api 基本操作
2024-08-21 00:49:33
使用的是完全分布式，详细信息为：
操作的Java 代码（抄的别人的）
package org.admln.hbase; 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.TableName;
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.Put;
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.util.Bytes; public class OperateTable {
// 声明静态配置
private static Configuration conf = null;
static {
conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "slave1");
conf.set("hbase.zookeeper.property.clientPort", "2181");
} // 创建数据库表
public static void createTable(String tableName, String[] columnFamilys)
throws Exception {
// 新建一个数据库管理员
HBaseAdmin hAdmin = new HBaseAdmin(conf); if (hAdmin.tableExists(tableName)) {
System.out.println("表已经存在");
System.exit(0);
} else {
// 新建一个 scores 表的描述
HTableDescriptor tableDesc = new HTableDescriptor(
TableName.valueOf(tableName));
// 在描述里添加列族
for (String columnFamily : columnFamilys) {
tableDesc.addFamily(new HColumnDescriptor(columnFamily));
}
// 根据配置好的描述建表
hAdmin.createTable(tableDesc);
System.out.println("创建表成功");
}
} // 删除数据库表
public static void deleteTable(String tableName) throws Exception {
// 新建一个数据库管理员
HBaseAdmin hAdmin = new HBaseAdmin(conf); if (hAdmin.tableExists(tableName)) {
// 关闭一个表
hAdmin.disableTable(tableName);
// 删除一个表
hAdmin.deleteTable(tableName);
System.out.println("删除表成功"); } else {
System.out.println("删除的表不存在");
System.exit(0);
}
} // 添加一条数据
public static void addRow(String tableName, String row,
String columnFamily, String column, String value) throws Exception {
HTable table = new HTable(conf, tableName);
Put put = new Put(Bytes.toBytes(row));
// 参数出分别：列族、列、值
put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),
Bytes.toBytes(value));
table.put(put);
} // 删除一条数据
public static void delRow(String tableName, String row) throws Exception {
HTable table = new HTable(conf, tableName);
Delete del = new Delete(Bytes.toBytes(row));
table.delete(del);
} // 删除多条数据
public static void delMultiRows(String tableName, String[] rows)
throws Exception {
HTable table = new HTable(conf, tableName);
List<Delete> list = new ArrayList<Delete>(); for (String row : rows) {
Delete del = new Delete(Bytes.toBytes(row));
list.add(del);
} table.delete(list);
} // get row
public static void getRow(String tableName, String row) throws Exception {
HTable table = new HTable(conf, tableName);
Get get = new Get(Bytes.toBytes(row));
Result result = table.get(get);
// 输出结果
for (KeyValue rowKV : result.raw()) {
System.out.print("Row Name: " + new String(rowKV.getRow()) + " ");
System.out.print("Timestamp: " + rowKV.getTimestamp() + " ");
System.out.print("column Family: " + new String(rowKV.getFamily())
+ " ");
System.out.print("Row Name: " + new String(rowKV.getQualifier())
+ " ");
System.out.println("Value: " + new String(rowKV.getValue()) + " ");
}
} // get all records
public static void getAllRows(String tableName) throws Exception {
HTable table = new HTable(conf, tableName);
Scan scan = new Scan();
ResultScanner results = table.getScanner(scan);
// 输出结果
for (Result result : results) {
for (KeyValue rowKV : result.raw()) {
System.out.print("Row Name: " + new String(rowKV.getRow())
+ " ");
System.out.print("Timestamp: " + rowKV.getTimestamp() + " ");
System.out.print("column Family: "
+ new String(rowKV.getFamily()) + " ");
System.out.print("Row Name: "
+ new String(rowKV.getQualifier()) + " ");
System.out.println("Value: " + new String(rowKV.getValue())
+ " ");
}
}
} // main
public static void main(String[] args) {
try {
String tableName = "users2"; // 第一步：创建数据库表：“users2”
String[] columnFamilys = { "info", "course" };
OperateTable.createTable(tableName, columnFamilys); // 第二步：向数据表的添加数据
// 添加第一行数据
OperateTable.addRow(tableName, "tht", "info", "age", "20");
OperateTable.addRow(tableName, "tht", "info", "sex", "boy");
OperateTable.addRow(tableName, "tht", "course", "china", "97");
OperateTable.addRow(tableName, "tht", "course", "math", "128");
OperateTable.addRow(tableName, "tht", "course", "english", "85");
// 添加第二行数据
OperateTable.addRow(tableName, "xiaoxue", "info", "age", "19");
OperateTable.addRow(tableName, "xiaoxue", "info", "sex", "boy");
OperateTable.addRow(tableName, "xiaoxue", "course", "china", "90");
OperateTable.addRow(tableName, "xiaoxue", "course", "math", "120");
OperateTable
.addRow(tableName, "xiaoxue", "course", "english", "90");
// 添加第三行数据
OperateTable.addRow(tableName, "qingqing", "info", "age", "18");
OperateTable.addRow(tableName, "qingqing", "info", "sex", "girl");
OperateTable
.addRow(tableName, "qingqing", "course", "china", "100");
OperateTable.addRow(tableName, "qingqing", "course", "math", "100");
OperateTable.addRow(tableName, "qingqing", "course", "english",
"99");
// 第三步：获取一条数据
System.out.println("获取一条数据");
OperateTable.getRow(tableName, "tht");
// 第四步：获取所有数据
System.out.println("获取所有数据");
OperateTable.getAllRows(tableName);
// 第五步：删除一条数据
System.out.println("删除一条数据");
OperateTable.delRow(tableName, "tht");
OperateTable.getAllRows(tableName);
// 第六步：删除多条数据
System.out.println("删除多条数据");
String[] rows = { "xiaoxue", "qingqing" };
OperateTable.delMultiRows(tableName, rows);
OperateTable.getAllRows(tableName);
// 第八步：删除数据库
System.out.println("删除数据库");
OperateTable.deleteTable(tableName); } catch (Exception err) {
err.printStackTrace();
}
}
}
运行结果为：
2014-11-11 14:09:00,368 WARN util.NativeCodeLoader (NativeCodeLoader.java:<clinit>(62)) - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
2014-11-11 14:09:00,455 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT
2014-11-11 14:09:00,455 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:host.name=WZJ-20140910JYZ
2014-11-11 14:09:00,455 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:java.version=1.7.0_72
2014-11-11 14:09:00,455 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:java.vendor=Oracle Corporation
2014-11-11 14:09:00,455 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:java.home=C:\Program Files (x86)\Java\jre7
2014-11-11 14:09:00,455 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:java.class.path= 。。。省略
2014-11-11 14:09:00,456 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:java.io.tmpdir=C:\Users\ADMINI~1\AppData\Local\Temp\
2014-11-11 14:09:00,456 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:java.compiler=<NA>
2014-11-11 14:09:00,456 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:os.name=Windows 7
2014-11-11 14:09:00,456 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:os.arch=x86
2014-11-11 14:09:00,456 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:os.version=6.1
2014-11-11 14:09:00,456 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:user.name=Administrator
2014-11-11 14:09:00,456 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:user.home=C:\Users\Administrator
2014-11-11 14:09:00,456 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:user.dir=D:\eclipseWorkspace32\hbase
2014-11-11 14:09:00,458 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=hconnection-0x21801b
2014-11-11 14:09:00,482 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:00,498 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:00,500 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:00,513 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d6002d, negotiated timeout = 90000
2014-11-11 14:09:00,680 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0x21801b
2014-11-11 14:09:00,683 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=catalogtracker-on-hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:00,683 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:00,684 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:00,686 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d6002e, negotiated timeout = 90000
2014-11-11 14:09:00,711 INFO Configuration.deprecation (Configuration.java:warnOnceIfDeprecated(840)) - hadoop.native.lib is deprecated. Instead, use io.native.lib.available
2014-11-11 14:09:01,078 INFO zookeeper.ZooKeeper (ZooKeeper.java:close(684)) - Session: 0x1499d5df1d6002e closed
2014-11-11 14:09:01,078 INFO zookeeper.ClientCnxn (ClientCnxn.java:run(509)) - EventThread shut down
2014-11-11 14:09:01,248 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0x21801b
2014-11-11 14:09:01,250 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=catalogtracker-on-hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:01,251 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:01,252 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:01,254 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d6002f, negotiated timeout = 90000
2014-11-11 14:09:01,263 INFO zookeeper.ZooKeeper (ZooKeeper.java:close(684)) - Session: 0x1499d5df1d6002f closed
2014-11-11 14:09:01,263 INFO zookeeper.ClientCnxn (ClientCnxn.java:run(509)) - EventThread shut down
创建表成功
获取一条数据
Row Name: tht Timestamp: 1415686141316 column Family: course Row Name: china Value: 97
Row Name: tht Timestamp: 1415686141343 column Family: course Row Name: english Value: 85
Row Name: tht Timestamp: 1415686141340 column Family: course Row Name: math Value: 128
Row Name: tht Timestamp: 1415686141303 column Family: info Row Name: age Value: 20
Row Name: tht Timestamp: 1415686141313 column Family: info Row Name: sex Value: boy
获取所有数据
Row Name: qingqing Timestamp: 1415686141375 column Family: course Row Name: china Value: 100
Row Name: qingqing Timestamp: 1415686141381 column Family: course Row Name: english Value: 99
Row Name: qingqing Timestamp: 1415686141378 column Family: course Row Name: math Value: 100
Row Name: qingqing Timestamp: 1415686141362 column Family: info Row Name: age Value: 18
Row Name: qingqing Timestamp: 1415686141365 column Family: info Row Name: sex Value: girl
Row Name: tht Timestamp: 1415686141316 column Family: course Row Name: china Value: 97
Row Name: tht Timestamp: 1415686141343 column Family: course Row Name: english Value: 85
Row Name: tht Timestamp: 1415686141340 column Family: course Row Name: math Value: 128
Row Name: tht Timestamp: 1415686141303 column Family: info Row Name: age Value: 20
Row Name: tht Timestamp: 1415686141313 column Family: info Row Name: sex Value: boy
Row Name: xiaoxue Timestamp: 1415686141353 column Family: course Row Name: china Value: 90
Row Name: xiaoxue Timestamp: 1415686141359 column Family: course Row Name: english Value: 90
Row Name: xiaoxue Timestamp: 1415686141355 column Family: course Row Name: math Value: 120
Row Name: xiaoxue Timestamp: 1415686141347 column Family: info Row Name: age Value: 19
Row Name: xiaoxue Timestamp: 1415686141350 column Family: info Row Name: sex Value: boy
删除一条数据
Row Name: qingqing Timestamp: 1415686141375 column Family: course Row Name: china Value: 100
Row Name: qingqing Timestamp: 1415686141381 column Family: course Row Name: english Value: 99
Row Name: qingqing Timestamp: 1415686141378 column Family: course Row Name: math Value: 100
Row Name: qingqing Timestamp: 1415686141362 column Family: info Row Name: age Value: 18
Row Name: qingqing Timestamp: 1415686141365 column Family: info Row Name: sex Value: girl
Row Name: xiaoxue Timestamp: 1415686141353 column Family: course Row Name: china Value: 90
Row Name: xiaoxue Timestamp: 1415686141359 column Family: course Row Name: english Value: 90
Row Name: xiaoxue Timestamp: 1415686141355 column Family: course Row Name: math Value: 120
Row Name: xiaoxue Timestamp: 1415686141347 column Family: info Row Name: age Value: 19
Row Name: xiaoxue Timestamp: 1415686141350 column Family: info Row Name: sex Value: boy
删除多条数据
删除数据库
2014-11-11 14:09:01,449 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0x21801b
2014-11-11 14:09:01,451 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=catalogtracker-on-hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:01,452 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:01,452 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:01,454 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d60030, negotiated timeout = 90000
2014-11-11 14:09:01,459 INFO zookeeper.ZooKeeper (ZooKeeper.java:close(684)) - Session: 0x1499d5df1d60030 closed
2014-11-11 14:09:01,459 INFO zookeeper.ClientCnxn (ClientCnxn.java:run(509)) - EventThread shut down
2014-11-11 14:09:01,460 INFO client.HBaseAdmin (HBaseAdmin.java:call(908)) - Started disable of users
2014-11-11 14:09:01,479 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0x21801b
2014-11-11 14:09:01,481 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=catalogtracker-on-hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:01,481 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:01,482 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:01,486 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d60031, negotiated timeout = 90000
2014-11-11 14:09:01,500 INFO zookeeper.ZooKeeper (ZooKeeper.java:close(684)) - Session: 0x1499d5df1d60031 closed
2014-11-11 14:09:01,500 INFO zookeeper.ClientCnxn (ClientCnxn.java:run(509)) - EventThread shut down
2014-11-11 14:09:01,601 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0x21801b
2014-11-11 14:09:01,603 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=catalogtracker-on-hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:01,604 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:01,604 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:01,606 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d60032, negotiated timeout = 90000
2014-11-11 14:09:01,614 INFO zookeeper.ZooKeeper (ZooKeeper.java:close(684)) - Session: 0x1499d5df1d60032 closed
2014-11-11 14:09:01,614 INFO zookeeper.ClientCnxn (ClientCnxn.java:run(509)) - EventThread shut down
2014-11-11 14:09:01,816 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0x21801b
2014-11-11 14:09:01,823 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=catalogtracker-on-hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:01,828 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:01,831 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:01,837 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d60033, negotiated timeout = 90000
2014-11-11 14:09:01,856 INFO zookeeper.ZooKeeper (ZooKeeper.java:close(684)) - Session: 0x1499d5df1d60033 closed
2014-11-11 14:09:01,856 INFO zookeeper.ClientCnxn (ClientCnxn.java:run(509)) - EventThread shut down
2014-11-11 14:09:02,157 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0x21801b
2014-11-11 14:09:02,161 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=catalogtracker-on-hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:02,163 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:02,164 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:02,168 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d60034, negotiated timeout = 90000
2014-11-11 14:09:02,185 INFO zookeeper.ZooKeeper (ZooKeeper.java:close(684)) - Session: 0x1499d5df1d60034 closed
2014-11-11 14:09:02,185 INFO zookeeper.ClientCnxn (ClientCnxn.java:run(509)) - EventThread shut down
2014-11-11 14:09:02,686 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=slave1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0x21801b
2014-11-11 14:09:02,691 INFO zookeeper.RecoverableZooKeeper (RecoverableZooKeeper.java:<init>(120)) - Process identifier=catalogtracker-on-hconnection-0x21801b connecting to ZooKeeper ensemble=slave1:2181
2014-11-11 14:09:02,691 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(966)) - Opening socket connection to server slave1/192.168.126.135:2181. Will not attempt to authenticate using SASL (unknown error)
2014-11-11 14:09:02,693 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(849)) - Socket connection established to slave1/192.168.126.135:2181, initiating session
2014-11-11 14:09:02,696 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1207)) - Session establishment complete on server slave1/192.168.126.135:2181, sessionid = 0x1499d5df1d60035, negotiated timeout = 90000
2014-11-11 14:09:02,721 INFO zookeeper.ZooKeeper (ZooKeeper.java:close(684)) - Session: 0x1499d5df1d60035 closed
2014-11-11 14:09:02,722 INFO zookeeper.ClientCnxn (ClientCnxn.java:run(509)) - EventThread shut down
2014-11-11 14:09:02,723 INFO client.HBaseAdmin (HBaseAdmin.java:disableTable(963)) - Disabled users
2014-11-11 14:09:02,874 INFO client.HBaseAdmin (HBaseAdmin.java:deleteTable(695)) - Deleted users
删除表成功
没报什么错误，只有一个没有找到hadoop本地库的警告
关于新建表时的新API操作TableName.valueOf(tablename);我看了一下TableName的源码
/**
* @throws IllegalArgumentException if fullName equals old root or old meta. Some code
* depends on this.
*/
public static TableName valueOf(String name) {
for (TableName tn : tableCache) {
if (name.equals(tn.getNameAsString())) {
return tn;
}
} int namespaceDelimIndex = name.indexOf(NAMESPACE_DELIM);
byte[] nameB = Bytes.toBytes(name); if (namespaceDelimIndex < 0) {
return createTableNameIfNecessary(
ByteBuffer.wrap(NamespaceDescriptor.DEFAULT_NAMESPACE_NAME),
ByteBuffer.wrap(nameB));
} else {
return createTableNameIfNecessary(
ByteBuffer.wrap(nameB, 0, namespaceDelimIndex),
ByteBuffer.wrap(nameB, namespaceDelimIndex + 1,
nameB.length - (namespaceDelimIndex + 1)));
}
}
valueOf是它的一个静态方法。注释我看不太懂，看代码可以看出多了两个判断，一个判断它是否已经在表缓存中了，一个是判断它的前缀问题，如果有就去掉。我不知道第二个具体有什么作用。
更详细的可以参考：http://www.aboutyun.com/thread-10989-1-1.html
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