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From Vladimir Rodionov <vrodio...@carrieriq.com>
Subject RE: does append delete all cell versions except the last one?
Date Tue, 23 Jul 2013 00:40:35 GMT
Here it is:

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import junit.framework.TestCase;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.MiniHBaseCluster;
import org.apache.hadoop.hbase.client.Append;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;

public class HBaseAppendTest extends TestCase{

        static final Log LOG = LogFactory.getLog(CoprocessorBaseTest.class);
        private static HBaseTestingUtility UTIL = new HBaseTestingUtility();
        protected byte[] TABLE_A = "TABLE_A".getBytes();
        protected byte[][] FAMILIES = new byte[][]
            {"fam_a".getBytes(), "fam_b".getBytes(), "fam_c".getBytes()};
        protected  byte[][] COLUMNS =
                {"col_a".getBytes(), "col_b".getBytes(),  "col_c".getBytes()};
        int VERSIONS = 10;

        /** The cluster. */
        MiniHBaseCluster cluster;
        HTableDescriptor tableDesc;
        HTable table;

        /* (non-Javadoc)
         * @see junit.framework.TestCase#setUp()
        public void setUp() throws Exception {
                ConsoleAppender console = new ConsoleAppender(); // create appender
                // configure the appender
                String PATTERN = "%d [%p|%c|%C{1}] %m%n";
                console.setLayout(new PatternLayout(PATTERN));

                // add appender to any Logger (here is root)
                Configuration conf = UTIL.getConfiguration();
                conf.set("hbase.zookeeper.useMulti", "false");
                cluster = UTIL.getMiniHBaseCluster();


         * Creates the HBase table.
         * @throws IOException Signals that an I/O exception has occurred.
        protected void createHBaseTable() throws IOException {

                LOG.error("Create HBase table and put data");
                HColumnDescriptor famA = new HColumnDescriptor(FAMILIES[0]);

                HColumnDescriptor famB = new HColumnDescriptor(FAMILIES[1]);

                HColumnDescriptor famC = new HColumnDescriptor(FAMILIES[2]);


                tableDesc = new HTableDescriptor(TABLE_A);

                Configuration cfg = cluster.getConf();
                HBaseAdmin admin = new HBaseAdmin(cfg);
                if( admin.tableExists(tableDesc.getName()) == false){
                        LOG.error("Created table "+tableDesc);

                table = new HTable(cfg, TABLE_A);
                // Create row
                List<KeyValue> rowData = generateRowData();
                Put put = createPut(rowData);
                // Put data


        protected Put createPut(List<KeyValue> values)
                Put put = new Put(values.get(0).getRow());
                for(KeyValue kv: values)
                        put.add(kv.getFamily(), kv.getQualifier(), kv.getTimestamp(), kv.getValue());
                return put;

        List<KeyValue> generateRowData(){
                byte[] row = "row".getBytes();
                byte[] value = "value".getBytes();
                long startTime = System.currentTimeMillis();
                ArrayList<KeyValue> list = new ArrayList<KeyValue>();
                int count = 0;
                for(byte[] f: FAMILIES){
                        for(byte[] c: COLUMNS){
                                count = 0;
                                for(; count < VERSIONS; count++){
                                        KeyValue kv = new KeyValue(row, f, c, startTime -
1000*(count),  value);
                Collections.sort(list, KeyValue.COMPARATOR);
                return list;
        protected Append createAppend(byte[] row, List<byte[]> families, List<byte[]>
columns, byte[] value){

                Append op = new Append(row);

                for(byte[] f: families){
                        for(byte[] c: columns){
                                op.add(f, c, value);
                return op;

        public void testAppend() throws IOException
                LOG.error("Test append started. Testing row: 'row'");

                byte[] row ="row".getBytes();
                byte[] toAppend = "_appended".getBytes();

                Get get = new Get(row);
                Result result = table.get(get);
                assertEquals(90, result.size() );

                Append append = createAppend(row, Arrays.asList(FAMILIES), Arrays.asList(COLUMNS),
                Result r = table.append(append);
                assertEquals(9, r.size());

                get = new Get(row);
                result = table.get(get);
                assertEquals (90, result.size());
                LOG.error("Test append finished.");
// -------------------------------------------------------------------------

Let me know your findings.

From: Ted Yu [yuzhihong@gmail.com]
Sent: Monday, July 22, 2013 4:32 PM
To: dev@hbase.apache.org
Subject: Re: does append delete all cell versions except the last one?

Can you formulate the code below as a unit test so that other people can
try it out ?

I pasted the code into a unit test but there were a few unresolved method
calls such as createGet().


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