| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.filter; |
| |
| import static org.junit.Assert.*; |
| |
| import org.apache.hadoop.hbase.HBaseClassTestRule; |
| import org.apache.hadoop.hbase.KeyValueUtil; |
| import org.apache.hadoop.hbase.testclassification.FilterTests; |
| import org.apache.hadoop.hbase.testclassification.SmallTests; |
| import org.apache.hadoop.hbase.util.Bytes; |
| import org.junit.Before; |
| import org.junit.ClassRule; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| |
| @Category({FilterTests.class, SmallTests.class}) |
| public class TestRandomRowFilter { |
| |
| @ClassRule |
| public static final HBaseClassTestRule CLASS_RULE = |
| HBaseClassTestRule.forClass(TestRandomRowFilter.class); |
| |
| protected RandomRowFilter quarterChanceFilter; |
| |
| @Before |
| public void setUp() throws Exception { |
| quarterChanceFilter = new RandomRowFilter(0.25f); |
| } |
| |
| /** |
| * Tests basics |
| * |
| * @throws Exception |
| */ |
| @Test |
| public void testBasics() throws Exception { |
| int included = 0; |
| int max = 1000000; |
| for (int i = 0; i < max; i++) { |
| if (!quarterChanceFilter.filterRowKey(KeyValueUtil.createFirstOnRow(Bytes.toBytes("row")))) { |
| included++; |
| } |
| } |
| // Now let's check if the filter included the right number of rows; |
| // since we're dealing with randomness, we must have a include an epsilon |
| // tolerance. |
| int epsilon = max / 100; |
| assertTrue("Roughly 25% should pass the filter", Math.abs(included - max |
| / 4) < epsilon); |
| } |
| |
| /** |
| * Tests serialization |
| * |
| * @throws Exception |
| */ |
| @Test |
| public void testSerialization() throws Exception { |
| RandomRowFilter newFilter = serializationTest(quarterChanceFilter); |
| // use epsilon float comparison |
| assertTrue("float should be equal", Math.abs(newFilter.getChance() |
| - quarterChanceFilter.getChance()) < 0.000001f); |
| } |
| |
| private RandomRowFilter serializationTest(RandomRowFilter filter) |
| throws Exception { |
| // Decompose filter to bytes. |
| byte[] buffer = filter.toByteArray(); |
| |
| // Recompose filter. |
| RandomRowFilter newFilter = RandomRowFilter.parseFrom(buffer); |
| |
| return newFilter; |
| } |
| |
| } |
| |