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https://issues.apache.org/jira/browse/FLINK-10537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16651439#comment-16651439
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ASF GitHub Bot commented on FLINK-10537:
----------------------------------------
zhijiangW commented on a change in pull request #6833: [FLINK-10537][network]
Fix network small performance degradation after merging [FLINK-9913]
URL: https://github.com/apache/flink/pull/6833#discussion_r225478741
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/api/serialization/SpanningRecordSerializer.java
##########
@@ -92,20 +92,9 @@ public void serializeRecord(T record) throws IOException {
*/
@Override
public SerializationResult copyToBufferBuilder(BufferBuilder
targetBuffer) {
- boolean mustCommit = false;
- if (lengthBuffer.hasRemaining()) {
Review comment:
Yes, comparing the cost of small records currently, that seems less
important. I just mentioned it to explain we can pursue the extreme of avoiding
any unnecessary overheads in theory.
But considering the tradeoff between complication and benefits, I can accept
your current implementation.
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> Network throughput performance regression after broadcast changes
> -----------------------------------------------------------------
>
> Key: FLINK-10537
> URL: https://issues.apache.org/jira/browse/FLINK-10537
> Project: Flink
> Issue Type: Bug
> Components: Network
> Affects Versions: 1.7.0
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
> Priority: Major
> Labels: pull-request-available
>
> There is a slight network throughput regression introduced in:
> https://issues.apache.org/jira/browse/FLINK-9913
> It is visible in the following benchmark:
> [http://codespeed.dak8s.net:8000/timeline/#/?exe=1&ben=networkThroughput.1,100ms&env=2&revs=200&equid=off&quarts=on&extr=on]
> (drop in the chart that happened since 21st September.)
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