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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/01/20 10:55:00 UTC
[jira] [Work logged] (BEAM-11657) Kafka read performance regression
due to added header support
[ https://issues.apache.org/jira/browse/BEAM-11657?focusedWorklogId=538340&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-538340 ]
ASF GitHub Bot logged work on BEAM-11657:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Jan/21 10:54
Start Date: 20/Jan/21 10:54
Worklog Time Spent: 10m
Work Description: scwhittle opened a new pull request #13782:
URL: https://github.com/apache/beam/pull/13782
When headers are not supported, there are no reflection calls remaining as this knowledge is computed once in the ConsumerSpEL singleton.
When headers are supported but the decoder does not implement the method to examine headers, there are no reflection calls based upon a cache keyed by decoder in the ConsumerSpeEL singleton.
When headers are supported and possibly used by the coder, a reflection-based expression is still evaluated for each deserialization. I tried to enable expression compilation but was unable to get it working, I believe due to the generics as part of the Deserializer<T> object but I am not sure. That is a possible performance improvement for the future for uses that require headers.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 538340)
Remaining Estimate: 0h
Time Spent: 10m
> Kafka read performance regression due to added header support
> -------------------------------------------------------------
>
> Key: BEAM-11657
> URL: https://issues.apache.org/jira/browse/BEAM-11657
> Project: Beam
> Issue Type: Bug
> Components: io-java-kafka
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Support for headers in KafkaIO reads was recently added:
> https://issues.apache.org/jira/browse/BEAM-10865
> This introduced several reflection calls into the path of advancing KafkaUnboundedReader. While separately running benchmarks, I noticed this regression.
> Calls currently come from:
> ConsumerSpEL.hasHeaders -> can be cached similar to other booleans
> deserialize key and value methods -> could be avoided in cases where headers are not being examined (at a minimum can be avoided for known coders like ByteArrayDeserializer)
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