[GitHub] [hadoop] steveloughran commented on a change in pull request #2646: HADOOP-17038 Support disabling buffered reads in ABFS positional reads.

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steveloughran commented on a change in pull request #2646:
URL: https://github.com/apache/hadoop/pull/2646#discussion_r570483886



##########
File path: hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/services/ITestAbfsPread.java
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@@ -0,0 +1,128 @@
+/**
+ * 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.hadoop.fs.azurebfs.services;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.concurrent.ExecutionException;
+
+import org.junit.Test;
+
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FutureDataInputStreamBuilder;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.azurebfs.AbstractAbfsIntegrationTest;
+import org.apache.hadoop.fs.azurebfs.constants.ConfigurationKeys;
+import org.apache.hadoop.fs.contract.ContractTestUtils;
+
+public class ITestAbfsPread extends AbstractAbfsIntegrationTest {
+
+  public ITestAbfsPread() throws Exception {
+  }
+
+  @Test
+  public void testPread() throws IOException {
+    describe("Testing preads in AbfsInputStream");
+    Path dest = path("ITestAbfsPread");
+
+    int dataSize = 100;
+    byte[] data = ContractTestUtils.dataset(dataSize, 'a', 26);
+    ContractTestUtils.writeDataset(getFileSystem(), dest, data, data.length,
+        dataSize, true);
+    int bytesToRead = 10;
+    try (FSDataInputStream inputStream = getFileSystem().open(dest)) {
+      assertTrue(
+          "unexpected stream type "
+              + inputStream.getWrappedStream().getClass().getSimpleName(),
+          inputStream.getWrappedStream() instanceof AbfsInputStream);
+      byte[] readBuffer = new byte[bytesToRead];
+      int pos = 0;
+      assertEquals(
+          "AbfsInputStream#read did not read the correct number of bytes",
+          bytesToRead, inputStream.read(pos, readBuffer, 0, bytesToRead));
+      assertTrue("AbfsInputStream#read did not read the correct bytes",
+          Arrays.equals(Arrays.copyOfRange(data, pos, pos + bytesToRead),

Review comment:
       I Think assertJ does even more...




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