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https://issues.apache.org/jira/browse/HDDS-9668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Doroszlai resolved HDDS-9668.
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Fix Version/s: 1.4.0
Resolution: Implemented
> Zero-Copy in EC GRPC (write)
> ----------------------------
>
> Key: HDDS-9668
> URL: https://issues.apache.org/jira/browse/HDDS-9668
> Project: Apache Ozone
> Issue Type: Improvement
> Components: Ozone Datanode
> Reporter: Duong
> Assignee: Duong
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.4.0
>
> Attachments: datanode-on-write-ec-ncopies.html,
> datanode-on-write-ec-zerocopies.html, ec-dn-io-comparison.png,
> ec-ncopies.png, ec_jvm_metric_comparison.png
>
>
> Today EC with GRPC copies input data buffer several times:
> * when parsing protobuf objects from the input network stream, data is
> copied from the original netty direct buffer to heap.
> * when writing data to files, the heap buffer needs to be copied to direct
> buffers by NIO.
> The cost of buffer copies themself is inefficient, it comes with GC
> consequences of cleaning up the intermediate buffers. Those together slow EC
> I/O down.
> !ec-ncopies.png|width=807,height=292!
> We can use the ZeroCopyMarshaller from RATIS-1932 to avoid all those issues.
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