/**
* 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.hive.common.util;
import java.util.ArrayList;
import java.util.List;
import org.apache.hive.common.util.RetryUtilities.ExponentiallyDecayingBatchWork;
import org.apache.hive.common.util.RetryUtilities.RetryException;
import org.junit.Assert;
import org.junit.Test;
public class TestRetryUtilities {
private class DummyExponentiallyDecayingBatchWork extends ExponentiallyDecayingBatchWork<Void> {
public DummyExponentiallyDecayingBatchWork(int batchSize, int reducingFactor,
int throwException) {
super(batchSize, reducingFactor, 0);
this.exceptionCount = throwException;
}
public DummyExponentiallyDecayingBatchWork(int batchSize, int reducingFactor,
int throwException, int maxRetries) {
super(batchSize, reducingFactor, maxRetries);
this.exceptionCount = throwException;
}
final List<Integer> batchSizes = new ArrayList<>();
int exceptionCount = 0;
@Override
public Void execute(int size) throws Exception {
batchSizes.add(size);
if (exceptionCount > 0) {
exceptionCount--;
throw new Exception("Dummy exception");
}
return null;
}
public int getCount() {
return batchSizes.size();
}
public int[] getBatchSizes() {
int[] ret = new int[batchSizes.size()];
int i = 0;
for (int b : batchSizes) {
ret[i++] = b;
}
return ret;
}
}
@Test(expected = IllegalArgumentException.class)
public void testZeroBatchSize() {
new DummyExponentiallyDecayingBatchWork(0, 2, 0);
}
@Test(expected = IllegalArgumentException.class)
public void testNegativeBatchSize() {
new DummyExponentiallyDecayingBatchWork(-1, 2, 0);
}
@Test(expected = IllegalArgumentException.class)
public void testZeroDecayingFactor() {
new DummyExponentiallyDecayingBatchWork(5, 0, 0);
}
@Test(expected = IllegalArgumentException.class)
public void testOneDecayingFactor() {
new DummyExponentiallyDecayingBatchWork(10, 1, 0);
}
@Test(expected = IllegalArgumentException.class)
public void testNegativeMaxRetries() {
new DummyExponentiallyDecayingBatchWork(10, 2, 0, -1);
}
@Test
public void testNumberOfAttempts() throws Exception {
// test perfectly divisible batchsize and decaying factor
DummyExponentiallyDecayingBatchWork dummy = new DummyExponentiallyDecayingBatchWork(10, 2, 0);
dummy.run();
Assert.assertEquals("Unexpected number of executions of execute method", 1, dummy.getCount());
// there were no exception. Batchsize doesn't change until there is an exception
Assert.assertArrayEquals(new int[] { 10 }, dummy.getBatchSizes());
// test batchsize is not divisible by decaying factor
dummy = new DummyExponentiallyDecayingBatchWork(11, 2, 0);
dummy.run();
Assert.assertEquals("Unexpected number of executions of execute method", 1, dummy.getCount());
// there were no exception. Batchsize doesn't change until there is an exception
Assert.assertArrayEquals(new int[] { 11 }, dummy.getBatchSizes());
dummy = new DummyExponentiallyDecayingBatchWork(11, 3, 1);
// batches will be sized 11,3
dummy.run();
Assert.assertEquals("Unexpected number of executions of execute method", 2, dummy.getCount());
Assert.assertArrayEquals(new int[] { 11, 3 }, dummy.getBatchSizes());
dummy = new DummyExponentiallyDecayingBatchWork(11, 3, 2);
// batches will be sized 11,3,1
dummy.run();
Assert.assertEquals("Unexpected number of executions of execute method", 3, dummy.getCount());
Assert.assertArrayEquals(new int[] { 11, 3, 1 }, dummy.getBatchSizes());
dummy = new DummyExponentiallyDecayingBatchWork(12, 3, 2);
// batches will be sized 12,4,1
dummy.run();
Assert.assertEquals("Unexpected number of executions of execute method", 3, dummy.getCount());
Assert.assertArrayEquals(new int[] { 12, 4, 1 }, dummy.getBatchSizes());
}
@Test
public void testZeroMaxRetriesValue() throws Exception {
DummyExponentiallyDecayingBatchWork dummy = new DummyExponentiallyDecayingBatchWork(10, 2, 3, 0);
dummy.run();
// batches will be sized 10, 5, 2, 1
Assert.assertEquals("Unexpected number of executions of execute method", 4, dummy.getCount());
Assert.assertArrayEquals(new int[] { 10, 5, 2, 1 }, dummy.getBatchSizes());
dummy = new DummyExponentiallyDecayingBatchWork(17, 2, 4, 0);
// batches will be sized 17, 8, 4, 2, 1
dummy.run();
Assert.assertEquals("Unexpected number of executions of execute method", 5, dummy.getCount());
Assert.assertArrayEquals(new int[] { 17, 8, 4, 2, 1 }, dummy.getBatchSizes());
}
@Test(expected = RetryException.class)
public void testRetriesExhausted() throws Exception {
// attempts at execute will be made using batchsizes 11, 3, 1, throws retry exception
DummyExponentiallyDecayingBatchWork dummy = new DummyExponentiallyDecayingBatchWork(11, 3, 3);
dummy.run();
}
}