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https://issues.apache.org/jira/browse/HDDS-15871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devesh Kumar Singh resolved HDDS-15871.
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Resolution: Duplicate
> Make BackgroundPipelineCreator tier-aware
> -----------------------------------------
>
> Key: HDDS-15871
> URL: https://issues.apache.org/jira/browse/HDDS-15871
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Devesh Kumar Singh
> Assignee: Devesh Kumar Singh
> Priority: Major
>
> BackgroundPipelineCreator pre-creates a small pool of OPEN pipelines to keep
> write latency low. Today it always creates DISK-tier pipelines (because
> PipelineFactory.create(replicationConfig) hardcodes
> StorageTier.getDefaultTier()). On a heterogeneous cluster, the first write to
> a HOT bucket therefore always has to wait for a fresh SSD pipeline to be
> created and reach OPEN.
> Extend the creator to iterate over the set of tiers actually supported by the
> cluster (discovered from DN storage reports) and pre-create one small pool
> per tier. A tier with no supporting DNs is skipped cleanly rather than
> failing.
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