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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:
-------------------------------
Description:
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 (due to wait 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.
was:
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 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 (due to wait 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.
> Ozone on CRAQ
> -------------
>
> Key: HDDS-12578
> URL: https://issues.apache.org/jira/browse/HDDS-12578
> Project: Apache Ozone
> Issue Type: Wish
> 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
> (due to wait 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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