Existence of Table using HBase Shell
You can verify the existence of a table using the exists command. The following example shows how to use this command.
hbase(main):024:0> exists 'emp' Table emp does exist 0 row(s) in 0.0750 seconds ================================================================== hbase(main):015:0> exists 'student' Table student does not exist 0 row(s) in 0.0480 seconds
Verifying the Existence of Table Using Java API
You can verify the existence of a table in HBase using the tableExists() method of the HBaseAdmin class. Follow the steps given below to verify the existence of a table in HBase.
Step 1
Instantiate the HBaseAdimn class // Instantiating configuration object Configuration conf = HBaseConfiguration.create(); // Instantiating HBaseAdmin class HBaseAdmin admin = new HBaseAdmin(conf);
Step 2
Verify the existence of the table using the tableExists( ) method.
Given below is the java program to test the existence of a table in HBase using java API.
import java.io.IOException;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.client.HBaseAdmin;
public class TableExists{
public static void main(String args[])throws IOException{
// Instantiating configuration class
Configuration conf = HBaseConfiguration.create();
// Instantiating HBaseAdmin class
HBaseAdmin admin = new HBaseAdmin(conf);
// Verifying the existance of the table
boolean bool = admin.tableExists("emp");
System.out.println( bool);
}
}
Compile and execute the above program as shown below.
$javac TableExists.java $java TableExists
The following should be the output:
true
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