[HBASE-15162] Add separate metrics for meta/data block hit ratio in cache

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Assignee: Unassigned
• Reporter: Yu Li
• Created: 25/Jan/16 09:18
• Updated: 01/Jul/22 20:30
• Resolved: 26/Jan/16 07:08

Description

Currently we already have a metrics in name of blockCacheExpressHitPercent to indicate the cache hit ratio. However, since meta block is small and often cached in memory with a high hit ratio, this "mixed" metrics could not show the real data block hit ratio which is more concerned.

We propose to add two new metrics to show meta and data block cache hit ratio separately, while reserving the old metrics for backward compatibility.

Issue Links

• depends upon: HBASE-15160 Put back HFile's HDFS op latency sampling code and add metrics for monitoring
• duplicates: HBASE-14983 Create metrics for per block type hit/miss ratios