dpcollins-google commented on code in PR #13162:
URL: https://github.com/apache/kafka/pull/13162#discussion_r1091834852
##########
clients/src/main/java/org/apache/kafka/common/utils/Utils.java:
##########
@@ -1225,13 +1226,11 @@ public static long tryWriteTo(TransferableChannel
destChannel,
* @param length The number of bytes to write
* @throws IOException For any errors writing to the output
*/
- public static void writeTo(DataOutput out, ByteBuffer buffer, int length)
throws IOException {
+ public static void writeTo(DataOutputStream out, ByteBuffer buffer, int
length) throws IOException {
if (buffer.hasArray()) {
out.write(buffer.array(), buffer.position() +
buffer.arrayOffset(), length);
} else {
- int pos = buffer.position();
- for (int i = pos; i < length + pos; i++)
- out.writeByte(buffer.get(i));
+ Channels.newChannel(out).write(buffer);
Review Comment:
Sure. In a particular workload, this code path was about 30% of CPU usage in
flamegraphs. It is now 2-3% after a local patch.
This hasn't been discussed in dev- its just an attempt to upstream a small
performance improvement.
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