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HADOOP-18463. Add an integration test to process data asynchronously during vectored read. (#4921) 

part of HADOOP-18103.

Contributed by: Mukund Thakur
This commit is contained in:
Mukund Thakur 2022-09-28 23:16:47 +05:30
parent bbe841e601
commit 0d772b353f
1 changed files with 68 additions and 0 deletions
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68
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/AbstractContractVectoredReadTest.java
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@ -19,12 +19,17 @@
package org.apache.hadoop.fs.contract;
import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.IntFunction;
import org.assertj.core.api.Assertions;
@ -42,7 +47,10 @@ import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.impl.FutureIOSupport;
import org.apache.hadoop.io.WeakReferencedElasticByteBufferPool;
import org.apache.hadoop.util.concurrent.HadoopExecutors;
import org.apache.hadoop.util.functional.FutureIO;
import static org.apache.hadoop.fs.contract.ContractTestUtils.VECTORED_READ_OPERATION_TEST_TIMEOUT_SECONDS;
import static org.apache.hadoop.fs.contract.ContractTestUtils.assertCapabilities;
import static org.apache.hadoop.fs.contract.ContractTestUtils.assertDatasetEquals;
import static org.apache.hadoop.fs.contract.ContractTestUtils.createFile;
@ -364,6 +372,66 @@ public abstract class AbstractContractVectoredReadTest extends AbstractFSContrac
}
}
/**
* This test creates list of ranges and then submit a readVectored
* operation and then uses a separate thread pool to process the
* results asynchronously.
*/
@Test
public void testVectoredIOEndToEnd() throws Exception {
FileSystem fs = getFileSystem();
List<FileRange> fileRanges = new ArrayList<>();
fileRanges.add(FileRange.createFileRange(8 * 1024, 100));
fileRanges.add(FileRange.createFileRange(14 * 1024, 100));
fileRanges.add(FileRange.createFileRange(10 * 1024, 100));
fileRanges.add(FileRange.createFileRange(2 * 1024 - 101, 100));
fileRanges.add(FileRange.createFileRange(40 * 1024, 1024));
ExecutorService dataProcessor = Executors.newFixedThreadPool(5);
CountDownLatch countDown = new CountDownLatch(fileRanges.size());
try (FSDataInputStream in = fs.open(path(VECTORED_READ_FILE_NAME))) {
in.readVectored(fileRanges, value -> pool.getBuffer(true, value));
for (FileRange res : fileRanges) {
dataProcessor.submit(() -> {
try {
readBufferValidateDataAndReturnToPool(res, countDown);
} catch (Exception e) {
String error = String.format("Error while processing result for %s", res);
LOG.error(error, e);
ContractTestUtils.fail(error, e);
}
});
}
// user can perform other computations while waiting for IO.
if (!countDown.await(VECTORED_READ_OPERATION_TEST_TIMEOUT_SECONDS, TimeUnit.SECONDS)) {
ContractTestUtils.fail("Timeout/Error while processing vectored io results");
}
} finally {
HadoopExecutors.shutdown(dataProcessor, LOG,
VECTORED_READ_OPERATION_TEST_TIMEOUT_SECONDS, TimeUnit.SECONDS);
}
}
private void readBufferValidateDataAndReturnToPool(FileRange res,
CountDownLatch countDownLatch)
throws IOException, TimeoutException {
CompletableFuture<ByteBuffer> data = res.getData();
// Read the data and perform custom operation. Here we are just
// validating it with original data.
FutureIO.awaitFuture(data.thenAccept(buffer -> {
assertDatasetEquals((int) res.getOffset(),
"vecRead", buffer, res.getLength(), DATASET);
// return buffer to the pool once read.
pool.putBuffer(buffer);
}),
VECTORED_READ_OPERATION_TEST_TIMEOUT_SECONDS, TimeUnit.SECONDS);
// countdown to notify main thread that processing has been done.
countDownLatch.countDown();
}
protected List<FileRange> createSampleNonOverlappingRanges() {
List<FileRange> fileRanges = new ArrayList<>();
fileRanges.add(FileRange.createFileRange(0, 100));