HBase在win7下eclipse中Java实现对表的操作报错解决

Linux系统安装了Hadoop2.5.2和Hbase-0.98.12

两者都是采用伪分布的方式进行安装。

package paic.hbase.com; import java.io.IOException; 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.MasterNotRunningException;import org.apache.hadoop.hbase.ZooKeeperConnectionException;import org.apache.hadoop.hbase.client.HBaseAdmin; public class HbaseTest {private static Configuration conf;static{conf = HBaseConfiguration.create();conf.set("hbase.rootdir", "hdfs://192.168.56.2:9000/hbase");//使用eclipse时必须添加这个，否则无法定位conf.set("hbase.zookeeper.quorum", "192.168.56.2");conf.set("hbase.zookeeper.property.clientPort", "2181");}public static void createTable(String tableName){System.out.println("start create table ......");try {HBaseAdmin hbAdmin = new HBaseAdmin(conf);if(hbAdmin.tableExists(tableName)){hbAdmin.disableTable(tableName);hbAdmin.deleteTable(tableName);System.out.println(tableName + " is exist,detele ....");}// HTableDescriptor htd = new HTableDescriptor(tableName);HTableDescriptor htd = new HTableDescriptor(tableName);htd.addFamily(new HColumnDescriptor("cf1"));htd.addFamily(new HColumnDescriptor("cf2"));htd.addFamily(new HColumnDescriptor("cf3"));htd.addFamily(new HColumnDescriptor("cf4"));hbAdmin.createTable(htd);} catch (MasterNotRunningException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ZooKeeperConnectionException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("end create table ......");}public static void main(String[] args) {createTable("testTable");}}

第一次执行报错如下：

start create table ......log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.java.io.IOException: Attempt to start meta tracker failed.at org.apache.hadoop.hbase.catalog.CatalogTracker.start(CatalogTracker.java:204)at org.apache.hadoop.hbase.client.HBaseAdmin.startCatalogTracker(HBaseAdmin.java:262)at org.apache.hadoop.hbase.client.HBaseAdmin.getCatalogTracker(HBaseAdmin.java:235)at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:306)at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:322)at paic.hbase.com.HbaseTest.createTable(HbaseTest.java:25)at paic.hbase.com.HbaseTest.main(HbaseTest.java:52)Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase/meta-region-serverat org.apache.zookeeper.KeeperException.create(KeeperException.java:99)at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045)at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:222)at org.apache.hadoop.hbase.zookeeper.ZKUtil.watchAndCheckExists(ZKUtil.java:427)at org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.start(ZooKeeperNodeTracker.java:77)at org.apache.hadoop.hbase.catalog.CatalogTracker.start(CatalogTracker.java:200)... 6 moreend create table ......

解决方案如下：

这种问题大概是Linux系统中防火墙没有关闭，试着去关闭一下防火墙。

由于我虚拟机上安装的CentOS7的Linux系统，因此使用如下命令：

[root@hadoop ~]# systemctl stop firewalld.service （停止防火墙）

[root@hadoop ~]#systemctl disable firewalld.service （禁止防火墙）

[root@hadoop ~]# iptables -L (查看防火墙状态)

参见http://my.oschina.net/miger/blog/320711

 

这样之后再次执行，发现了另一种报错：

start create table ......log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=35, exceptions:Mon Jun 08 10:00:36 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:00:36 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:00:36 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:00:37 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:00:39 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:00:43 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:00:54 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:01:04 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:01:14 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:01:24 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:01:44 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:02:04 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:02:24 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:02:44 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:03:04 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:03:24 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:03:44 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:04:04 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:04:25 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:04:45 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:05:05 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:05:25 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:05:45 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:06:05 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:06:25 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:06:45 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:07:05 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:07:25 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:07:46 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:08:06 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:08:26 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:08:46 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:09:06 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:09:26 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoopMon Jun 08 10:09:46 CST 2015, org.apache.hadoop.hbase.client.RpcRetryingCaller@28c5ea2, java.net.UnknownHostException:  unknown host: hadoop at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:131)at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:91)at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:284)at org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:189)at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:184)at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:110)at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:775)at org.apache.hadoop.hbase.catalog.MetaReader.fullScan(MetaReader.java:542)at org.apache.hadoop.hbase.catalog.MetaReader.tableExists(MetaReader.java:310)at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:308)at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:322)at paic.hbase.com.HbaseTest.createTable(HbaseTest.java:27)at paic.hbase.com.HbaseTest.main(HbaseTest.java:54)Caused by: java.net.UnknownHostException: unknown host: hadoopat org.apache.hadoop.hbase.ipc.RpcClient$Connection.<init>(RpcClient.java:385)at org.apache.hadoop.hbase.ipc.RpcClient.createConnection(RpcClient.java:351)at org.apache.hadoop.hbase.ipc.RpcClient.getConnection(RpcClient.java:1530)at org.apache.hadoop.hbase.ipc.RpcClient.call(RpcClient.java:1442)at org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1661)at org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.callBlockingMethod(RpcClient.java:1719)at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$BlockingStub.scan(ClientProtos.java:31392)at org.apache.hadoop.hbase.client.ScannerCallable.openScanner(ScannerCallable.java:318)at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:163)at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:58)at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:115)... 12 moreend create table ......

这个问题的解决方案如下：

需要修改win7下的C:\Windows\System32\drivers\etc\hosts这个文件，但是由于这个文件修改涉及到权限的问题，需要去修改一下权限。具体参见网上的 Win7系统修改hosts文件不能保存的问题。 www.jb51.net/os/windows/75930.html

这个在hosts的文件中添加一行

192.168.56.2 hadoop

其中192.168.56.2是Linux系统的ip地址，hadoop是hostname主机名。

 

修改并成功保存之后，在win下ping

 ping 192.168.56.2 和 ping hadoop 如果都能成功，说明是OK