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https://issues.apache.org/jira/browse/HBASE-9115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13728999#comment-13728999
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Lars Hofhansl commented on HBASE-9115:
--------------------------------------
Thanks Ted and Stack.
Incidentally, the same is not quite correct for Increment (sorting happens by
the Increment object not by the Store on the server, but let's fix that in
another issue - if we even want to touch that).
+1 on addendum3.
> HTableInterface.append operation may overwrites values
> ------------------------------------------------------
>
> Key: HBASE-9115
> URL: https://issues.apache.org/jira/browse/HBASE-9115
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.10
> Environment: MAC OS X 10.8.4, Hbase in the pseudo-distributed mode,
> hadoop v1.2.0, Hbase Java API based client.
> *hdfs-site.xml*:
> {code:xml}
> <configuration>
> <property>
> <name>dfs.replication</name>
> <value>1</value>
> </property>
> <property>
> <name>dfs.support.append</name>
> <value>true</value>
> </property>
> </configuration>
> {code}
> *hbase-site.xml*:
> {code:xml}
> <configuration>
> <property>
> <name>hbase.rootdir</name>
> <value>hdfs://localhost:9000/hbase</value>
> </property>
> <property>
> <name>hbase.cluster.distributed</name>
> <value>true</value>
> </property>
> <property>
> <name>hbase.zookeeper.quorum</name>
> <value>localhost</value>
> </property>
> <property>
> <name>dfs.support.append</name>
> <value>true</value>
> </property>
> </configuration>
> {code}
> Reporter: Aleksandr B
> Assignee: Ted Yu
> Priority: Critical
> Fix For: 0.98.0, 0.95.2, 0.94.11
>
> Attachments: 9115-0.94.txt, 9115-0.94-v2.txt, 9115-trunk.addendum,
> 9115-trunk.addendum2, 9115-trunk.addendum3, 9115-trunk.txt
>
>
> I use Hbase Java API and I try to append values Bytes.toBytes("one two") and
> Bytes.toBytes(" three") in 3 columns.
> Only for 2 out of these 3 columns the result is "one two three".
> *Output from the hbase shell:*
> {noformat}
> hbase(main):008:0* scan "mytesttable"
> ROW COLUMN+CELL
>
> mytestRowKey column=TestA:dlbytes,
> timestamp=1375436156140, value=one two three
>
> mytestRowKey column=TestA:tbytes,
> timestamp=1375436156140, value=one two three
>
> mytestRowKey column=TestA:ulbytes,
> timestamp=1375436156140, value= three
>
> 1 row(s) in 0.0280 seconds
> {noformat}
> *My test code:*
> {code:title=Database.java|borderStyle=solid}
> import static org.junit.Assert.*;
> import java.io.IOException;
>
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.hbase.HBaseConfiguration;
> import org.apache.hadoop.hbase.HColumnDescriptor;
> import org.apache.hadoop.hbase.HTableDescriptor;
> import org.apache.hadoop.hbase.client.HBaseAdmin;
> import org.apache.hadoop.hbase.client.HTableInterface;
> import org.apache.hadoop.hbase.client.HTablePool;
> import org.apache.hadoop.hbase.client.Append;
> import org.apache.hadoop.hbase.client.Result;
> import org.apache.hadoop.hbase.util.Bytes;
> import org.junit.Test;
> ...
> @Test
> public void testAppend() throws IOException {
> byte [] rowKey = Bytes.toBytes("mytestRowKey");
> byte [] column1 = Bytes.toBytes("ulbytes");
> byte [] column2 = Bytes.toBytes("dlbytes");
> byte [] column3 = Bytes.toBytes("tbytes");
> String part11 = "one two";
> String part12 = " three";
> String cFamily = "TestA";
> String TABLE = "mytesttable";
> Configuration conf = HBaseConfiguration.create();
> HTablePool pool = new HTablePool(conf, 10);
> HBaseAdmin admin = new HBaseAdmin(conf);
>
> if(admin.tableExists(TABLE)){
> admin.disableTable(TABLE);
> admin.deleteTable(TABLE);
> }
>
> HTableDescriptor tableDescriptor = new HTableDescriptor(TABLE);
> HColumnDescriptor hcd = new HColumnDescriptor(cFamily);
> hcd.setMaxVersions(1);
> tableDescriptor.addFamily(hcd);
> admin.createTable(tableDescriptor);
> HTableInterface table = pool.getTable(TABLE);
>
> Append a = new Append(rowKey);
> a.setReturnResults(false);
> a.add(Bytes.toBytes(cFamily), column1, Bytes.toBytes(part11));
> a.add(Bytes.toBytes(cFamily), column2, Bytes.toBytes(part11));
> a.add(Bytes.toBytes(cFamily), column3, Bytes.toBytes(part11));
> table.append(a);
> a = new Append(rowKey);
> a.add(Bytes.toBytes(cFamily), column1, Bytes.toBytes(part12));
> a.add(Bytes.toBytes(cFamily), column2, Bytes.toBytes(part12));
> a.add(Bytes.toBytes(cFamily), column3, Bytes.toBytes(part12));
> Result result = table.append(a);
> byte [] resultForColumn1 = result.getValue(Bytes.toBytes(cFamily),
> column1);
> byte [] resultForColumn2 = result.getValue(Bytes.toBytes(cFamily),
> column2);
> byte [] resultForColumn3 = result.getValue(Bytes.toBytes(cFamily),
> column3);
> if (resultForColumn1 == null || resultForColumn2 == null ||
> resultForColumn3 == null)
> System.out.println("The DB table contains these values but they
> are never given back, strange...");
> else {
> assertEquals(0, Bytes.compareTo(Bytes.toBytes(part11 + part12),
> resultForColumn1));
> assertEquals(0, Bytes.compareTo(Bytes.toBytes(part11 + part12),
> resultForColumn2));
> assertEquals(0, Bytes.compareTo(Bytes.toBytes(part11 + part12),
> resultForColumn3));
> }
> HTable t = new HTable(conf, TABLE);
> Get getOperation = new Get(rowKey);
> getOperation.addColumn(Bytes.toBytes(cFamily), column1);
> Result res = t.get(getOperation);
> assertEquals(0, Bytes.compareTo(Bytes.toBytes(part11 + part12),
> res.getValue(Bytes.toBytes(cFamily), column1)));
> }
> {code}
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