Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5234#discussion_r27451154
--- Diff:
network/common/src/main/java/org/apache/spark/network/protocol/MessageEncoder.java
---
@@ -72,9 +80,84 @@ public void encode(ChannelHandlerContext ctx, Message
in, List<Object> out) {
in.encode(header);
assert header.writableBytes() == 0;
- out.add(header);
if (body != null && bodyLength > 0) {
- out.add(body);
+ out.add(new MessageWithHeader(header, headerLength, body,
bodyLength));
+ } else {
+ out.add(header);
}
}
+
+ /**
+ * A wrapper message that holds two separate pieces (a header and a
body) to avoid
+ * copying the body's content.
+ */
+ private static class MessageWithHeader extends AbstractReferenceCounted
implements FileRegion {
--- End diff --
Yes - I think epoll won't work and we should just disable it. We'd need
more work on Netty proper to support epoll for this.
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