ChenSammi commented on code in PR #6372:
URL: https://github.com/apache/ozone/pull/6372#discussion_r1524329911
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hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/fs/ozone/TestOzoneFSInputStream.java:
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@@ -162,6 +164,76 @@ public void testO3FSSingleByteRead() throws IOException {
}
}
+ @Test
+ public void testByteBufferPositionedRead() throws IOException {
+ try (FSDataInputStream inputStream = fs.open(filePath)) {
+ ByteBuffer buffer = ByteBuffer.allocate(20);
+ // Read positional from 50th index
+ int readBytes = inputStream.read(50, buffer);
+ byte[] value1 = new byte[readBytes];
+ System.arraycopy(buffer.array(), 0, value1, 0, readBytes);
+ byte[] value2 = new byte[readBytes];
+ System.arraycopy(data, 50, value2, 0, readBytes);
+ // Verify input and positional read data
+ assertArrayEquals(value1, value2, "value mismatch");
+
+ buffer.clear();
+ // Verify offset of file didn't change
+ // Read positional from 8th index again using same inputStream
+ readBytes = inputStream.read(8, buffer);
+ byte[] value3 = new byte[readBytes];
+ System.arraycopy(buffer.array(), 0, value3, 0, readBytes);
+ byte[] value4 = new byte[readBytes];
+ System.arraycopy(data, 8, value4, 0, readBytes);
+ // Verify input and positional read data
+ assertArrayEquals(value3, value4, "value mismatch");
+
+ // Buffer size more than actual data, still read should succeed
+ ByteBuffer buffer1 = ByteBuffer.allocate(30 * 1024 * 1024 * 2);
+ readBytes = inputStream.read(12, buffer1);
Review Comment:
Can you add readBytes check, to make sure the bytes read value is as
expected?
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