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https://issues.apache.org/jira/browse/HDDS-12578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Andika updated HDDS-12578:
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Issue Type: New Feature (was: Wish)
> Ozone on CRAQ
> -------------
>
> Key: HDDS-12578
> URL: https://issues.apache.org/jira/browse/HDDS-12578
> Project: Apache Ozone
> Issue Type: New Feature
> Reporter: Ivan Andika
> Assignee: Ivan Andika
> Priority: Major
>
> This is just a long-term wish to explore Chain Replication or CRAQ on Ozone.
> Currently Ozone supports Raft based write pipeline and EC. From the Data
> replication spectrum
> ([https://transactional.blog/blog/2024-data-replication-design-spectrum]),
> these two pipelines cover the Leader-based (Raft based write pipeline) and
> Quorum-based (EC) replication algorithm types. CRAQ falls under
> Reconfiguration-based replication algorithms.
> We can consider supporting CRAQ pipelines on Ozone. As mentioned in
> discussion
> [https://github.com/apache/ozone/discussions/6870#discussioncomment-9907706],
> chained replication might be needed for rolling upgrade support. Although
> CRAQ promised higher bandwidth, higher read performance, and strong
> consistency, there are some drawbacks such as higher write latency (since all
> writes need to propagate to the tail), higher downtime during node failure
> (waiting for the control plane to reconfigure the chains), etc.
> The wish comes from the recent DeepSeek 3FS distributed file system that uses
> CRAQ as its main write pipeline
> (https://github.com/deepseek-ai/3FS/blob/main/docs/design_notes.md). Other
> system such as Meta's Delta
> (https://engineering.fb.com/2022/05/04/data-infrastructure/delta/) also uses
> CRAQ.
>
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