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https://issues.apache.org/jira/browse/HBASE-30020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Rodionov resolved HBASE-30020.
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Fix Version/s: 4.0.0-alpha-1
Resolution: Implemented
> introduce CachePlacementAdmissionPolicy API and wire it into topology with
> default behavior equivalent to current HBase behavior
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-30020
> URL: https://issues.apache.org/jira/browse/HBASE-30020
> Project: HBase
> Issue Type: New Feature
> Components: BlockCache, Performance
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0-alpha-1
>
>
> h2. Description
> Introduce a policy layer responsible for cache admission and placement
> decisions as part of the pluggable block cache architecture.
> The policy layer encapsulates logic for:
> * admission control (whether a block should be cached)
> * tier placement (L1 vs L2)
> * promotion decisions on cache hits
> * representation decisions (e.g., compressed vs uncompressed)
> h3. Scope
> * Introduce *CachePlacementPolicy* abstraction
> * Define supporting decision objects:
> ** *AdmissionDecision*
> ** *CacheTopologyView*
> * Integrate policy into cache insertion ({{put(...)}}) path
> * Ensure policy is invoked via *CacheTopology* / *CacheAccessService*
> integration points
> h3. Notes
> * Initial implementation must preserve current HBase behavior
> * No behavior change intended
> * Existing cache implementations (*LruBlockCache*, *BucketCache*,
> *CombinedBlockCache*) remain unchanged
> * This change makes cache decisions explicit instead of being implicit in
> call sites or topology logic
> * Lays groundwork for future optimization and experimentation with admission
> and placement strategies
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