Error while connecting to HBase remotely through Java

Hi
When i try to connect to HBase remotely i will get below error. But no issues while i run it from same server .
Below error recieved in eclipse console :
13/03/22 16:25:22 ERROR hbase.HServerAddress: Could not resolve the DNS name of anupama
java.lang.IllegalArgumentException: hostname can’t be null

Below is my /etchosts file:
13/03/22 16:25:22 ERROR hbase.HServerAddress: Could not resolve the DNS name of anupama
java.lang.IllegalArgumentException: hostname can’t be null
Any suggestions ??

Topic

[Larry LiuModerator]

Hi, Anups

I did a bit more research on HTable. I think this is used when you want to do something with the existing table.

Please let me know if you need anything else.

Thanks
Larry

[anupsMember]

Thanks a lot Larry,

tried with your code and it worked !!!

Regards
Anups

[Larry LiuModerator]

Hi, Anups,

From your source code, it seems the createTable is not called since it is commented.
// createTable(config);

Also I am not sure this is the correct code to create a table from java api. Here are some codes which will work:
############
HBaseConfiguration hc = new HBaseConfiguration( new Configuration( ) );

HTableDescriptor ht = new HTableDescriptor( “mytable” );
// we’ll use the call start time as a row key
ht.addFamily( new HColumnDescriptor( “number:” ) ); // from and to
ht.addFamily( new HColumnDescriptor( “company:” ) );
ht.addFamily( new HColumnDescriptor( “time:” ) ); // billing seconds
ht.addFamily( new HColumnDescriptor( “location:” ) ); // rate center city 1, state 1 and city 2, state 2

System.out.println( “connecting…” );
HBaseAdmin hba = new HBaseAdmin( hc );
System.out.println( “creating table…” );
hba.createTable( ht );
System.out.println( “done!” );
##############

Thanks.
Larry

[anupsMember]

Hi
I added the ip of linux machine which i was to connect remotely in my windows machine and that error was gone .
But now am receiving a different error ie : “org.apache.hadoop.hbase.TableNotFoundException: Cannot find row in .META. for my table ” .
Am writing a code to create a table in HBase remotely. Below is code :
public class CreateTable {
public static void main(String[] agrs) {
// CONFIGURATION

// ENSURE RUNNING
try {
Configuration hbaseConfig ;
hbaseConfig = HBaseConfiguration.create();
hbaseConfig.set(“hbase.zookeeper.quorum”, “192.168.36.21″);
hbaseConfig.set(“hbase.zookeeper.property.clientPort”,”2181″);
/* hbaseConfig.set(“hbase.master”, “anupama:60000″); */
//*HBaseConfiguration config = HBaseConfiguration.create();
//config.set(“hbase.zookeeper.quorum”, “localhost”); // Here we are running zookeeper locally
HBaseAdmin.checkHBaseAvailable(hbaseConfig);
System.out.println(“HBase is running!”);
// createTable(config);
//creating a new table
HTable table = new HTable(hbaseConfig, “mytable”);
System.out.println(“Table mytable obtained “);
/* addData(table); */
}
catch (MasterNotRunningException e) {
System.out.println(“HBase is not running!”);
System.exit(1);
}catch (Exception ce){ ce.printStackTrace(); }

}

private static void addData(HTable table) {
// TODO Auto-generated method stub

}
}

[anupsMember]

Hi
I am really sorry.. Please find the below /etc/hosts file
192.168.36.21 anupama
#127.0.0.1 localhost localhost.localdomain
#192.168.36.21 localhost localhost.localdomain
::1 localhost6.localdomain6 localhost

Regards
Anups

[tedrMember]

Hi Anups,

Thanks for using Hortonworks Data Platform.

Unfortunately you posted you error message where you intended to post your /etc/hosts file so I cannot tell if any thing is incorrect in your /etc/hosts.

Please repost your /etc/hosts file.

Thanks,
Ted.

[Author]

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