Github user squito commented on a diff in the pull request: https://github.com/apache/spark/pull/20461#discussion_r165213755 --- Diff: common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/OneForOneBlockFetcher.java --- @@ -171,7 +171,9 @@ private void failRemainingBlocks(String[] failedBlockIds, Throwable e) { @Override public void onData(String streamId, ByteBuffer buf) throws IOException { - channel.write(buf); + while (buf.hasRemaining()) { + channel.write(buf); --- End diff -- I actually thought this is OK for a FileChannel (just based on this comment in the original: https://github.com/apache/spark/pull/16989/files#r115409001) but certainly this seems like a safe change. Just wondering if you observed an issue, or this is just to be safe.
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