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

["Jaehui Lee (Jira)" <ji...@apache.org>]

Jaehui Lee created HBASE-29731:
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             Summary: 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


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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