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		05-24-2016
	
		
		09:43 AM
	
	
	
	
	
	
	
	
	
	
	
	
	
	
		
	
				
		
			
					
	
		1 Kudo
		
	
				
		
	
		
					
							 Hi @nejm hadjmbarek, I'm Posting my code, which is working Fine:      import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.PreparedStatement;
import java.sql.Statement;
public class phoenix_hbase 
{
 public static void main(String[] args) throws SQLException 
 {
  @SuppressWarnings("unused")
  Statement stmt = null;
  ResultSet rset = null;
 
  try 
  {
   Class.forName("org.apache.phoenix.jdbc.PhoenixDriver");
  } 
  catch (ClassNotFoundException e1) 
  {
   System.out.println("Exception Loading Driver");
   e1.printStackTrace();
  }
  try
  {
   Connection con = DriverManager.getConnection("jdbc:phoenix:172.31.124.43:2181:/hbase-unsecure");  //172.31.124.43 is the adress of VM, not needed if ur running the program from vm itself
   stmt = con.createStatement();
    
   PreparedStatement statement = con.prepareStatement("select * from javatest");
   rset = statement.executeQuery();
   while (rset.next()) 
   {
    System.out.println(rset.getString("mycolumn"));
   }
   statement.close();
   con.close();
  }
  catch(Exception e)
  {
   System.out.println(e.getMessage());
  }
 }
}
 
						
					
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		04-05-2016
	
		
		12:14 PM
	
	
	
	
	
	
	
	
	
	
	
	
	
	
		
	
				
		
			
					
				
		
	
		
					
							 Thanks for the input guys. I increased RS heap to 16GB and increased handler count to 200. Also we performed manual major compaction on few HBase tables majorly used by customer. After that HBase read performance dropped to acceptable limits. 
						
					
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		11-14-2017
	
		
		08:18 AM
	
	
	
	
	
	
	
	
	
	
	
	
	
	
		
	
				
		
			
					
				
		
	
		
					
							 On my cluster NiFi and one of three HBase Region Server run on same server. I modified NiFi boostrap.conf file and uncommented java.arg.13=-XX:+UseG1GC then Region Server stopped. I tried many times to restart, once it started soon it stopped again till I commented out java.arg.13=-XX:+UseG1GC property. It now works. I think the property changes the server's JVM garbage collections style. 
						
					
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		11-08-2016
	
		
		10:51 PM
	
	
	
	
	
	
	
	
	
	
	
	
	
	
		
	
				
		
			
					
				
		
	
		
					
							 Spoke to author.. still relevant.. 
						
					
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		02-02-2016
	
		
		09:03 PM
	
	
	
	
	
	
	
	
	
	
	
	
	
	
		
	
				
		
			
					
				
		
	
		
					
							 @Mikael are you still having issues? Can you accept the best answer or provide your own solution? 
						
					
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		12-10-2015
	
		
		06:45 PM
	
	
	
	
	
	
	
	
	
	
	
	
	
	
		
	
				
		
			
					
				
		
	
		
					
							 Great! Glad to hear it's working for you now. I'd encourage you to up-vote and/or accept my answer as correct so other people know for the future. 
						
					
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		01-11-2017
	
		
		04:40 PM
	
	
	
	
	
	
	
	
	
	
	
	
	
	
		
	
				
		
			
					
				
		
	
		
					
							 
	@Christopher Bridge There was a recent issue in https://issues.apache.org/jira/browse/PHOENIX-3126, but this was not included in HDP-2.5.0.0. Connections by PQS to HBase are always made by the PQS principal+keytab -- the end user is always "proxied" on top of the PQS credentials.  If you have an example code which shows something happening and can describe why you think this is wrong, I'll try to take a look at it. If you are a Hortonworks customer, you can/should also reach out through support channels. 
						
					
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		10-23-2015
	
		
		03:17 PM
	
	
	
	
	
	
	
	
	
	
	
	
	
	
		
	
				
		
			
					
				
		
	
		
					
							 Thanks, @Guilherme Braccialli, I'll try to get that patched on the Phoenix site. 
						
					
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