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https://issues.apache.org/jira/browse/HDDS-15969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chung-En Lee reassigned HDDS-15969:
-----------------------------------
Assignee: Chung-En Lee
> Prioritize Ratis Streaming capable DataNodes during Pipeline creation with
> graceful fallback
> --------------------------------------------------------------------------------------------
>
> Key: HDDS-15969
> URL: https://issues.apache.org/jira/browse/HDDS-15969
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Chung-En Lee
> Assignee: Chung-En Lee
> Priority: Major
>
> During rolling upgrades or in heterogeneous clusters, random node selection
> makes forming a 100% Ratis Streaming pipeline rare (e.g., (1/2)^3 = 12.5%
> chance when 50% nodes support it), leading to frequent client fallbacks.
> To maximize streaming pipeline creation without sacrificing availability, we
> introduce a *two-phase node selection* strategy for {{{}THREE{}}}-factor
> pipelines:
> # *Strict Phase:* Exclude nodes lacking Ratis Streaming support (along with
> over-utilized nodes) and attempt allocation.
> # *Fallback Phase:* If allocation fails due to insufficient streaming nodes,
> fall back to standard allocation with relaxed capability checks.
> This prioritizes Ratis Streaming nodes when available while ensuring full
> cluster fallback resilience.
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