[
https://issues.apache.org/jira/browse/HDDS-15969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
ASF GitHub Bot updated HDDS-15969:
----------------------------------
Labels: pull-request-available (was: )
> 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
> Labels: pull-request-available
>
> 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.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
