[HBASE-28189] Fix the miss count in one of CombinedBlockCache getBlock implementations

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0, 3.0.0-alpha-4, 2.4.17, 2.5.6, 4.0.0-alpha-1
• Fix Version/s: 2.6.0, 2.4.18, 3.0.0-beta-1, 2.5.7
• Assignee: Wellington Chevreuil
• Reporter: Wellington Chevreuil
• Created: 06/Nov/23 21:28
• Updated: 26/Jun/24 12:13
• Resolved: 09/Nov/23 10:55

Description

In one of the CombinedBlockCache.getBlock(getBlock(cacheKey,cachingrepeat,updateCacheMetrics) we always compute a miss in L1 if the passed block is of type DATA. We should compute the miss in one of the caches only, not both.

Issue Links

• causes: HBASE-28364 Warn: Cache key had block type null, but was found in L1 cache
• links to: GitHub Pull Request #5506