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/*
* 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.spark.util.collection.unsafe.sort;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import org.junit.Assert;
import org.junit.Test;
import org.apache.spark.HashPartitioner;
import org.apache.spark.SparkConf;
import org.apache.spark.memory.TestMemoryConsumer;
import org.apache.spark.memory.TestMemoryManager;
import org.apache.spark.memory.TaskMemoryManager;
import org.apache.spark.unsafe.Platform;
import org.apache.spark.unsafe.memory.MemoryBlock;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.greaterThanOrEqualTo;
import static org.hamcrest.Matchers.isIn;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.mock;
public class UnsafeInMemorySorterSuite {
private static String getStringFromDataPage(Object baseObject, long baseOffset, int length) {
final byte[] strBytes = new byte[length];
Platform.copyMemory(baseObject, baseOffset, strBytes, Platform.BYTE_ARRAY_OFFSET, length);
return new String(strBytes, StandardCharsets.UTF_8);
}
@Test
public void testSortingEmptyInput() {
final TaskMemoryManager memoryManager = new TaskMemoryManager(
new TestMemoryManager(new SparkConf().set("spark.memory.offHeap.enabled", "false")), 0);
final TestMemoryConsumer consumer = new TestMemoryConsumer(memoryManager);
final UnsafeInMemorySorter sorter = new UnsafeInMemorySorter(consumer,
memoryManager,
mock(RecordComparator.class),
mock(PrefixComparator.class),
100);
final UnsafeSorterIterator iter = sorter.getSortedIterator();
Assert.assertFalse(iter.hasNext());
}
@Test
public void testSortingOnlyByIntegerPrefix() throws Exception {
final String[] dataToSort = new String[] {
"Boba",
"Pearls",
"Tapioca",
"Taho",
"Condensed Milk",
"Jasmine",
"Milk Tea",
"Lychee",
"Mango"
};
final TaskMemoryManager memoryManager = new TaskMemoryManager(
new TestMemoryManager(new SparkConf().set("spark.memory.offHeap.enabled", "false")), 0);
final TestMemoryConsumer consumer = new TestMemoryConsumer(memoryManager);
final MemoryBlock dataPage = memoryManager.allocatePage(2048, null);
final Object baseObject = dataPage.getBaseObject();
// Write the records into the data page:
long position = dataPage.getBaseOffset();
for (String str : dataToSort) {
final byte[] strBytes = str.getBytes(StandardCharsets.UTF_8);
Platform.putInt(baseObject, position, strBytes.length);
position += 4;
Platform.copyMemory(
strBytes, Platform.BYTE_ARRAY_OFFSET, baseObject, position, strBytes.length);
position += strBytes.length;
}
// Since the key fits within the 8-byte prefix, we don't need to do any record comparison, so
// use a dummy comparator
final RecordComparator recordComparator = new RecordComparator() {
@Override
public int compare(
Object leftBaseObject,
long leftBaseOffset,
Object rightBaseObject,
long rightBaseOffset) {
return 0;
}
};
// Compute key prefixes based on the records' partition ids
final HashPartitioner hashPartitioner = new HashPartitioner(4);
// Use integer comparison for comparing prefixes (which are partition ids, in this case)
final PrefixComparator prefixComparator = new PrefixComparator() {
@Override
public int compare(long prefix1, long prefix2) {
return (int) prefix1 - (int) prefix2;
}
};
UnsafeInMemorySorter sorter = new UnsafeInMemorySorter(consumer, memoryManager, recordComparator,
prefixComparator, dataToSort.length);
// Given a page of records, insert those records into the sorter one-by-one:
position = dataPage.getBaseOffset();
for (int i = 0; i < dataToSort.length; i++) {
if (!sorter.hasSpaceForAnotherRecord()) {
sorter.expandPointerArray(consumer.allocateArray(sorter.numRecords() * 2 * 2));
}
// position now points to the start of a record (which holds its length).
final int recordLength = Platform.getInt(baseObject, position);
final long address = memoryManager.encodePageNumberAndOffset(dataPage, position);
final String str = getStringFromDataPage(baseObject, position + 4, recordLength);
final int partitionId = hashPartitioner.getPartition(str);
sorter.insertRecord(address, partitionId);
position += 4 + recordLength;
}
final UnsafeSorterIterator iter = sorter.getSortedIterator();
int iterLength = 0;
long prevPrefix = -1;
Arrays.sort(dataToSort);
while (iter.hasNext()) {
iter.loadNext();
final String str =
getStringFromDataPage(iter.getBaseObject(), iter.getBaseOffset(), iter.getRecordLength());
final long keyPrefix = iter.getKeyPrefix();
assertThat(str, isIn(Arrays.asList(dataToSort)));
assertThat(keyPrefix, greaterThanOrEqualTo(prevPrefix));
prevPrefix = keyPrefix;
iterLength++;
}
assertEquals(dataToSort.length, iterLength);
}
}
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