kinolaev commented on code in PR #15792:
URL: https://github.com/apache/iceberg/pull/15792#discussion_r3083247455
##########
aws/src/test/java/org/apache/iceberg/aws/s3/TestS3InputStream.java:
##########
@@ -62,4 +66,36 @@ void testReadTailClosesTheStream() throws IOException {
verify(inputStream).close();
}
+
+ @Test
+ void testReadRetriesOnPrematureConnectionClose() throws IOException {
Review Comment:
I added a MockServer and real S3 calls to the test in
c3c43875c8a0ad94ef5ded0970bd76a346d8b952.
I've also found that UrlConnectionHttpClient returns -1 from `read` when the
connection is closed prematurely instead of throwing an exception. That is why
I added `handleResultIf` to the retry policy that checks if `read` returns -1
before the expected end of the stream. The PR now covers both clients' behavior.
Additionally, I've tested both clients with minio in
`aws/src/integration/java/org/apache/iceberg/aws/s3/TestS3InputStream.java`:
```java
public class TestS3InputStream {
// ...
@Test
public void
testReadRetriesOnPrematureConnectionCloseWithApacheHttpClient() throws
Exception {
testReadRetriesOnPrematureConnectionClose(s3, "apache");
}
public void
testReadRetriesOnPrematureConnectionCloseWithUrlConnectionHttpClient() throws
Exception {
testReadRetriesOnPrematureConnectionClose(s3urlconnection,
"urlconnection");
}
private void testReadRetriesOnPrematureConnectionClose(S3Client s3, String
filename) throws Exception {
S3URI uri = new
S3URI("s3://bucket/path/to/read-retries-on-premature-connection-close-%s.dat".formatted(filename));
byte[] data = randomData(16 * 1024 * 1024);
writeS3Data(uri, data);
S3InputStream stream = newInputStream(s3, uri);
int blockSize = data.length / 2;
byte[] buf1 = new byte[blockSize];
assertThat(stream.readNBytes(buf1, 0, blockSize)).isEqualTo(blockSize);
assertThat(buf1).isEqualTo(Arrays.copyOfRange(data, 0, blockSize));
Thread.sleep(32000);
byte[] buf2 = new byte[blockSize];
assertThat(stream.readNBytes(buf2, 0, blockSize)).isEqualTo(blockSize);
assertThat(buf2).isEqualTo(Arrays.copyOfRange(data, blockSize,
data.length));
// RetryPolicy.builder().onRetry(e -> { attemptCount =
e.getAttemptCount(); })
assertThat(stream.attemptCount).isEqualTo(1);
}
}
```
I didn't commit these tests because on my laptop they only succeed when the
delay between the read calls is greater than 30s. Otherwise there are no
retries (`attemptCount=0`). I'm not sure this specific delay is consistent
enough across different environments to reliably reproduce the behavior and I
didn't want to increase the total execution time.
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