pvary commented on code in PR #13997:
URL: https://github.com/apache/iceberg/pull/13997#discussion_r2382513747
##########
api/src/main/java/org/apache/iceberg/io/RangeReadable.java:
##########
@@ -77,4 +83,61 @@ default void readFully(long position, byte[] buffer) throws
IOException {
default int readTail(byte[] buffer) throws IOException {
return readTail(buffer, 0, buffer.length);
}
+
+ /**
+ * Read fully a list of file ranges asynchronously from this file. As a
result of the call, each
+ * range will have FileRange.setData(CompletableFuture) called with a future
that when complete
+ * will have a ByteBuffer with the data from the file's range.
+ *
+ * <p>The position returned by getPos() after readVectored() is undefined.
+ *
+ * <p>If a file is changed while the readVectored() operation is in
progress, the output is
+ * undefined. Some ranges may have old data, some may have new and some may
have both.
+ *
+ * <p>While a readVectored() operation is in progress, normal read api calls
may block.
+ *
+ * @param ranges the byte ranges to read
+ * @param allocate the function to allocate ByteBuffer
+ * @throws IOException any IOE.
+ * @throws IllegalArgumentException if any of ranges are invalid, or they
overlap.
+ */
+ default void readVectored(List<FileRange> ranges, IntFunction<ByteBuffer>
allocate)
+ throws IOException {
+ List<FileRange> validatedRanges = sortRanges(ranges);
+ for (FileRange range : validatedRanges) {
+ ByteBuffer buffer = allocate.apply(range.length());
+ readFully(range.offset(), buffer.array());
+ range.byteBuffer().complete(buffer);
+ }
+ }
+
+ static List<FileRange> sortRanges(final List<FileRange> input) {
+ Preconditions.checkNotNull(input, "Null input list");
Review Comment:
nit: fix this too please.
```
Preconditions.checkNotNull(input, "Input list can't be null");
```
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