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https://issues.apache.org/jira/browse/FLINK-22994?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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lynn1.zhang updated FLINK-22994:
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Attachment: test.sql
> Improve the performance of invoking nesting udf
> -----------------------------------------------
>
> Key: FLINK-22994
> URL: https://issues.apache.org/jira/browse/FLINK-22994
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Runtime
> Affects Versions: 1.12.4
> Environment: h5.
> Reporter: lynn1.zhang
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2021-06-15-15-18-12-619.png,
> image-2021-06-15-15-19-01-103.png, image-2021-06-15-15-27-26-739.png,
> image-2021-06-15-15-28-28-137.png, image-2021-06-15-15-29-09-773.png,
> image-2021-06-15-15-30-14-775.png, image-2021-06-15-15-42-08-065.png,
> new_projection_code, old_projection_code, test.sql
>
>
> h1. BackGround
> Flink maintain the udf result as BinaryData, like BinaryStringData. When
> invoking nesting udf like select useless(int_ip_2_string(ip)), the result of
> int_ip_2_string(ip) will be serialization and deserialization.
> Below is the Generated Code
> !image-2021-06-15-15-18-12-619.png! This issue will improve it as below
> !image-2021-06-15-15-19-01-103.png!
> h1. Performance Compare
> Condition: Source = Kafka, Schema = PB with snappy; Flink Slot = 1;
> taskmanager.memory.process.size=4g; Linux Core = Intel(R) Xeon(R) Gold 5218
> CPU @ 2.30GHz
> UDF Introduction:
> * ipip: input: int ip, output: map ip_info, map size = 14.
> * ip_2_country: input map ip_info, output: string country.
> * ip_2_region: input map ip_info, output: string region.
> * ip_2_isp_domain: input map ip_info, output: string isp.
> * ip_2_timezone: input map ip_info, output: string timezone.
> h5. The throughput without udf invoke: 764.50 k/s
> !image-2021-06-15-15-27-26-739.png!
> h5. The throughput with udf invoke: 183.24 k/s
> !image-2021-06-15-15-42-08-065.png!
> h5. The throughput with udf nesting invoke: 41.42 k/s
> !image-2021-06-15-15-29-09-773.png!
> h5. The throughput with udf nesting invoke after this issue: 174.41 k/s
> !image-2021-06-15-15-30-14-775.png!
>
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