netudima commented on code in PR #3606: URL: https://github.com/apache/cassandra/pull/3606#discussion_r1932445879
########## test/unit/org/apache/cassandra/io/util/ThreadLocalReadAheadBufferTest.java: ########## @@ -0,0 +1,184 @@ +/* + * 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.cassandra.io.util; + + +import java.io.FileOutputStream; +import java.io.IOException; +import java.nio.ByteBuffer; +import java.nio.file.Files; +import java.util.List; +import java.util.Random; + +import org.junit.AfterClass; +import org.junit.Assert; +import org.junit.BeforeClass; +import org.junit.Test; + +import org.apache.cassandra.config.DataStorageSpec; +import org.apache.cassandra.io.compress.BufferType; +import org.apache.cassandra.io.compress.CorruptBlockException; +import org.apache.cassandra.utils.Pair; +import org.quicktheories.WithQuickTheories; +import org.quicktheories.core.Gen; + +import static org.apache.cassandra.config.CassandraRelevantProperties.JAVA_IO_TMPDIR; + +public class ThreadLocalReadAheadBufferTest implements WithQuickTheories +{ + private static final int numFiles = 5; + private static final File[] files = new File[numFiles]; + + @BeforeClass + public static void setup() + { + int seed = new Random().nextInt(); + for (int i = 0; i < numFiles; i++) + { + int size = new Random().nextInt((Integer.MAX_VALUE - 1) / 8); + files[i] = writeFile(seed, size); + } + } + + @AfterClass + public static void cleanup() + { + for (File f : files) + { + f.delete(); + } + } + + @Test + public void testLastBlockReads() + { + qt().forAll(lastBlockReads()) + .checkAssert(this::testReads); + } + + @Test + public void testReadsLikeChannelProxy() + { + + qt().forAll(randomReads()) + .checkAssert(this::testReads); + } + + private void testReads(InputData propertyInputs) + { + try (ChannelProxy channel = new ChannelProxy(propertyInputs.file)) + { + ThreadLocalReadAheadBuffer trlab = new ThreadLocalReadAheadBuffer(channel, new DataStorageSpec.IntKibibytesBound("256KiB").toBytes(), BufferType.OFF_HEAP); + for (Pair<Long, Integer> read : propertyInputs.positionsAndLengths) + { + int readSize = Math.min(read.right,(int) (channel.size() - read.left)); + ByteBuffer buf1 = ByteBuffer.allocate(readSize); + channel.read(buf1, read.left); + + ByteBuffer buf2 = ByteBuffer.allocate(readSize); + try + { + int copied = 0; + while (copied < readSize) { + trlab.fill(read.left + copied); + int leftToRead = readSize - copied; + if (trlab.remaining() >= leftToRead) + copied += trlab.read(buf2, leftToRead); + else + copied += trlab.read(buf2, trlab.remaining()); + } + } + catch (CorruptBlockException e) + { + throw new RuntimeException(e); + } + + Assert.assertEquals(buf1, buf2); + } + } + } + + private Gen<InputData> lastBlockReads() + { + return arbitrary().pick(List.of(files)) + .flatMap((file) -> + lists().of(longs().between(0, fileSize(file)).zip(integers().between(1, 100), Pair::create)) + .ofSizeBetween(5, 10) + .map(positionsAndLengths -> new InputData(file, positionsAndLengths))); + + } + + private Gen<InputData> randomReads() + { + int blockSize = new DataStorageSpec.IntKibibytesBound("256KiB").toBytes(); + return arbitrary().pick(List.of(files)) + .flatMap((file) -> + lists().of(longs().between(fileSize(file) - blockSize, fileSize(file)).zip(integers().between(1, 100), Pair::create)) + .ofSizeBetween(5, 10) + .map(positionsAndLengths -> new InputData(file, positionsAndLengths))); + + } + + // need this becasue generators don't handle the IOException + private long fileSize(File file) + { + try + { + return Files.size(file.toPath()); + } catch (IOException e) + { + throw new RuntimeException(e); + } + } + + private static class InputData + { + + private final File file; + private final List<Pair<Long, Integer>> positionsAndLengths; + + public InputData(File file, List<Pair<Long, Integer>> positionsAndLengths) + { + this.file = file; + this.positionsAndLengths = positionsAndLengths; + } + } + + private static File writeFile(int seed, int length) + { + String fileName = JAVA_IO_TMPDIR.getString() + "data+" + length + ".bin"; Review Comment: I were very-very unlucky :-) and got the same random number twice, in this case the test fails due to repeating file names, it would be better to use a sequence to name the files: ``` at org.apache.cassandra.io.util.ThreadLocalReadAheadBufferTest.cleanup(ThreadLocalReadAheadBufferTest.java:67) ... Caused by: java.nio.file.NoSuchFileException: /var/folders/d2/pzjmpmzd71j7qp55ry4b98qw0000gn/T/data+2097151.bin at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86) at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102) at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107) at sun.nio.fs.UnixFileSystemProvider.implDelete(UnixFileSystemProvider.java:244) at sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:103) at java.nio.file.Files.delete(Files.java:1126) at org.apache.cassandra.io.util.PathUtils.delete(PathUtils.java:246) ... 21 more ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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