steveloughran commented on code in PR #951:
URL: https://github.com/apache/parquet-mr/pull/951#discussion_r890388928
##########
parquet-hadoop/src/main/java/org/apache/parquet/hadoop/util/HadoopStreams.java:
##########
@@ -51,7 +52,7 @@ public class HadoopStreams {
public static SeekableInputStream wrap(FSDataInputStream stream) {
Objects.requireNonNull(stream, "Cannot wrap a null input stream");
if (byteBufferReadableClass != null && h2SeekableConstructor != null &&
- byteBufferReadableClass.isInstance(stream.getWrappedStream())) {
+ isWrappedStreamByteBufferReadable(stream)) {
Review Comment:
this is really going into the internals of the hadoop classes and
potentially tricky if there is any dynamic decision making in the inner class.
The good news there is I don't see anything doing that.
there is a way to ask (hadoop 3.2+) if a stream does support the API before
calling, using the StreamCapabilities interface.
https://issues.apache.org/jira/browse/HDFS-14111
```java
if (stream.hasCapability( "in:readbytebuffer") {
// stream is confident it has the api
) else {
// do the checking of the inner class
}
##########
parquet-hadoop/src/main/java/org/apache/parquet/hadoop/util/HadoopStreams.java:
##########
@@ -66,6 +67,15 @@ public static SeekableInputStream wrap(FSDataInputStream
stream) {
}
}
+ private static boolean isWrappedStreamByteBufferReadable(FSDataInputStream
stream) {
+ InputStream wrapped = stream.getWrappedStream();
+ if (wrapped instanceof FSDataInputStream) {
+ return isWrappedStreamByteBufferReadable(((FSDataInputStream) wrapped));
Review Comment:
you can't. the inner stream is set in the constructor, so cannot take the
not-yet-constructed class as an argument.
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