Re: Poor performance of table Increment

[larsh]

Note that you're doing single RPCs for each Increment. You should batch them 
(see HTable.batch(...))

What version of HBase? What's the ping time between the client and server 
machines?Is Nagle's disables (tcpnodelay set to true)? Otherwise each RPC will 
take at least 45 ms.

Lastly you'll likely hit the same server for every request in a microbenchmark 
like this.

You are also not actually incrementing anything since each one is a new row (I 
realize this is just a test),so to test whether this is related to Increment, 
can you replace the Increment by Put and see how long that takes?

-- Lars

      From: 陆巍 <luwei...@163.com>
 To: user@hbase.apache.org 
 Sent: Saturday, July 9, 2016 3:14 AM
 Subject: Poor performance of table Increment
   
Hi,

I had a test for Increment operation, and find the performance is really bad: 
94809ms for 1000 increment operaions.
The testing cluster is pretty small with only three region servers.

Below is the code for testing. Is there any bentchmark result for htable 
increment? Thanks!

import java.io.IOException;
import java.util.Random;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Increment;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;

class HBaseTableFactory {
    private Configuration config = HBaseConfiguration.create();
    private Connection connection = null;

    public Table createTable(String tableName) throws IOException {
        if (connection == null) {
            connection = ConnectionFactory.createConnection(config);
        }
        return create(tableName, config);
    }

    protected Table create(String tableName, Configuration config)
            throws IOException {
        return connection.getTable(TableName.valueOf(tableName));
    }

}

public class TestBytes {
    public static void main(String[] args) throws IOException {
        long t1 = System.currentTimeMillis();
        Table table = new HBaseTableFactory().createTable("xyz");
        for (int i = 0; i < 1000; i++) {

            byte[] row = Bytes.toBytes("row-" + i);
            Increment p = new Increment(row);
            byte[] f = Bytes.toBytes("cf1");
            byte[] q = Bytes.toBytes("q1");
            long v = 1L;
            p.addColumn(f, q, v);
            table.increment(p);
            System.out.println(i);
        }
        table.close();
        System.out.println(System.currentTimeMillis() - t1);
    }
}