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https://issues.apache.org/jira/browse/HDDS-5752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17646274#comment-17646274
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Michael Smith commented on HDDS-5752:
-------------------------------------
What were the applicable conditions? The usual scenario is TLS, where
https://github.com/ocadaruma/jktls is a good example of setting up kTLS with
sendfile.
> Add FileRegion API for Ozone Streaming
> --------------------------------------
>
> Key: HDDS-5752
> URL: https://issues.apache.org/jira/browse/HDDS-5752
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Kaijie Chen
> Assignee: Kaijie Chen
> Priority: Major
> Labels: pull-request-available
>
> Ratis streaming supports {{writeAsync(File, position, count)}} API, which is
> backed by Netty {{FileRegion}} and {{FileChannel.transferTo}}.
> Let's introduce a new interface {{FileRegionStreamOutput}} to implement zero
> copy in {{OzoneDataStreamOutput}}, {{KeyDataStreamOutput}},
> {{BlockDataStreamOutputEntry}} and {{BlockDataStreamOutput}}.
> Our tests shows Streaming(FileRegion) API have better performance over Async
> API.
> And it's a good performance reference for the Streaming(ByteBuffer) API.
> https://issues.apache.org/jira/browse/HDDS-5685?focusedCommentId=17416557&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17416557
> Test A (single 10GB key)
> ||API||Min||Max||Avg||
> |Async|64s|72s|68s|
> |Streaming (MappedByteBuffer)|55s|68s|62s|
> |Streaming (FileRegion)|55s|64s|61s|
> Test B (24x 1GB keys from 1 client)
> ||API||Min||Max||Avg||
> |Async|48s|54s|51s|
> |Streaming (MappedByteBuffer)|32s|>630s|33s|
> |Streaming (FileRegion)|36s|39s|38s|
>
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