hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestMaxResultsPerColumnFamily.java

   1 /**
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18 package org.apache.hadoop.hbase.regionserver;
  19
  20 import static org.junit.Assert.assertEquals;
  21 import org.apache.hadoop.hbase.HBaseClassTestRule;
  22 import org.apache.hadoop.hbase.HBaseTestingUtil;
  23 import org.apache.hadoop.hbase.TableName;
  24 import org.apache.hadoop.hbase.client.Admin;
  25 import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
  26 import org.apache.hadoop.hbase.client.Put;
  27 import org.apache.hadoop.hbase.client.Result;
  28 import org.apache.hadoop.hbase.client.ResultScanner;
  29 import org.apache.hadoop.hbase.client.Scan;
  30 import org.apache.hadoop.hbase.client.Table;
  31 import org.apache.hadoop.hbase.client.TableDescriptor;
  32 import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
  33 import org.apache.hadoop.hbase.testclassification.MediumTests;
  34 import org.apache.hadoop.hbase.util.Bytes;
  35 import org.junit.AfterClass;
  36 import org.junit.BeforeClass;
  37 import org.junit.ClassRule;
  38 import org.junit.Rule;
  39 import org.junit.Test;
  40 import org.junit.experimental.categories.Category;
  41 import org.junit.rules.TestName;
  42
  43 @Category(MediumTests.class)
  44 public class TestMaxResultsPerColumnFamily {
  45
  46   @ClassRule
  47   public static final HBaseClassTestRule CLASS_RULE =
  48     HBaseClassTestRule.forClass(TestMaxResultsPerColumnFamily.class);
  49
  50   private static final byte [][] FAMILIES = {
  51     Bytes.toBytes("1"), Bytes.toBytes("2")
  52   };
  53
  54   private static final byte [][] VALUES = {
  55     Bytes.toBytes("testValueOne"), Bytes.toBytes("testValueTwo")
  56   };
  57
  58   private static final HBaseTestingUtil UTIL = new HBaseTestingUtil();
  59
  60   @BeforeClass
  61   public static void setUpBeforeClass() throws Exception {
  62     UTIL.startMiniCluster(1);
  63   }
  64
  65   @AfterClass
  66   public static void tearDownAfterClass() throws Exception {
  67     UTIL.shutdownMiniCluster();
  68   }
  69
  70   @Rule
  71   public TestName name = new TestName();
  72
  73   @Test
  74   public void testSetMaxResultsPerColumnFamilySimple() throws Exception {
  75     TableName tableName = TableName.valueOf(name.getMethodName());
  76     Admin admin = UTIL.getAdmin();
  77     ColumnFamilyDescriptorBuilder cfBuilder0 =
  78     ColumnFamilyDescriptorBuilder.newBuilder(FAMILIES[0]);
  79
  80     TableDescriptor tableDescriptor =
  81       TableDescriptorBuilder.newBuilder(tableName).setColumnFamily(cfBuilder0.build()).build();
  82     admin.createTable(tableDescriptor);
  83     try (Table table = UTIL.getConnection().getTable(tableName)) {
  84
  85       for (int i = 0; i < 30000; i++) {
  86         byte[] ROW = Bytes.toBytes("" + i);
  87         Put p = new Put(ROW);
  88
  89         p.addColumn(FAMILIES[0], Bytes.toBytes("" + 1), VALUES[1]);
  90         p.addColumn(FAMILIES[0], Bytes.toBytes("" + 2), VALUES[0]);
  91
  92         table.put(p);
  93       }
  94     }
  95
  96     try (Table t = UTIL.getConnection().getTable(tableName)) {
  97       int expected = 30000;
  98
  99       Scan limits = new Scan().setReadType(Scan.ReadType.PREAD);
 100       limits.setMaxResultsPerColumnFamily(1);
 101
 102       int count1 = countScanRows(t, limits);
 103       assertEquals(expected, count1);
 104     }
 105   }
 106
 107   static int countScanRows(Table t, Scan scan) throws Exception {
 108
 109     int count = 0;
 110     try(ResultScanner scanner = t.getScanner(scan)) {
 111       for(Result r:scanner) {
 112         count ++;
 113       }
 114     }
 115     return count;
 116   }
 117 }