Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/22105#discussion_r210133826
--- Diff:
common/network-common/src/main/java/org/apache/spark/network/protocol/MessageWithHeader.java
---
@@ -140,8 +140,24 @@ private int copyByteBuf(ByteBuf buf,
WritableByteChannel target) throws IOExcept
// SPARK-24578: cap the sub-region's size of returned nio buffer to
improve the performance
// for the case that the passed-in buffer has too many components.
int length = Math.min(buf.readableBytes(), NIO_BUFFER_LIMIT);
--- End diff --
@vanzin This is to avoid memory copy when writing a large ByteBuffer. You
merged this actually: #12083
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