[jira] [Updated] (HBASE-29731) Add L1 and L2 cache hit/miss caching metrics

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-29731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated HBASE-29731:
-----------------------------------
    Labels: pull-request-available  (was: )

> Add L1 and L2 cache hit/miss caching metrics
> --------------------------------------------
>
>                 Key: HBASE-29731
>                 URL: https://issues.apache.org/jira/browse/HBASE-29731
>             Project: HBase
>          Issue Type: Improvement
>          Components: BlockCache
>            Reporter: Jaehui Lee
>            Assignee: Jaehui Lee
>            Priority: Minor
>              Labels: pull-request-available
>
> h2. Description
> Currently, HBase provides hit/miss caching metrics only at the overall BlockCache level. While the general hit ratio includes all read operations, we prefer using the hit caching ratio because it excludes non-cached reads (such as those from compactions) that would otherwise skew the overall hit ratio downward.
> When using only L1 cache, the existing BlockCache-level metrics are sufficient. However, when both L1 and L2 caches are enabled, CompoundBlockCache reports aggregated metrics (L1 + L2 combined), making it impossible to monitor the hit/miss caching ratio for each cache tier individually.
> h2. Proposed Solution
> Add separate hit/miss caching metrics for L1 and L2 caches to enable independent monitoring of each cache tier's performance.



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