| /* |
| * 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.fluo.core.worker.finder.hash; |
| |
| import java.util.Random; |
| |
| import com.google.common.math.DoubleMath; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.fluo.accumulo.iterators.NotificationHashFilter; |
| import org.apache.fluo.accumulo.util.ColumnConstants; |
| import org.apache.fluo.accumulo.util.NotificationUtil; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.fluo.api.data.Column; |
| import org.apache.fluo.core.impl.Notification; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| public class HashTest { |
| |
| @Test |
| public void testHashingConsistency() { |
| |
| Random rand = new Random(7); |
| |
| int count = 0; |
| |
| for (int i = 0; i < 1000; i++) { |
| byte[] row = new byte[16]; |
| byte[] cf = new byte[16]; |
| byte[] cq = new byte[16]; |
| |
| rand.nextBytes(row); |
| rand.nextBytes(cf); |
| rand.nextBytes(cq); |
| |
| if (check(row, cf, cq)) { |
| count++; |
| } |
| } |
| |
| double percentage = count / 1000.0; |
| double expected = 1.0 / 7; |
| |
| Assert.assertTrue(DoubleMath.fuzzyEquals(percentage, expected, .1)); |
| } |
| |
| private boolean check(byte[] row, byte[] cf, byte[] cq) { |
| Column col = new Column(Bytes.of(cf), Bytes.of(cq)); |
| |
| byte[] cfcq = NotificationUtil.encodeCol(col); |
| Key k = new Key(row, ColumnConstants.NOTIFY_CF.toArray(), cfcq, new byte[0], 6); |
| boolean accept = NotificationHashFilter.accept(k, 7, 3); |
| Assert.assertEquals(accept, PartitionManager.shouldProcess(Notification.from(k), 7, 3)); |
| return accept; |
| } |
| } |