Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20026#discussion_r158235088
--- Diff:
core/src/main/java/org/apache/spark/io/NioBufferedFileInputStream.java ---
@@ -61,6 +61,7 @@ private boolean refill() throws IOException {
nRead = fileChannel.read(byteBuffer);
}
if (nRead < 0) {
+ byteBuffer.flip();
--- End diff --
Doesn't `nRead < 0` means we actually don't read any bytes?
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