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Posted to issues@hbase.apache.org by "guluo (Jira)" <ji...@apache.org> on 2025/12/10 11:06:00 UTC

[jira] [Created] (HBASE-29767) Fix IOTimePerHit NaN issue in BucketCacheStats

guluo created HBASE-29767:
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             Summary: Fix IOTimePerHit NaN issue in BucketCacheStats
                 Key: HBASE-29767
                 URL: https://issues.apache.org/jira/browse/HBASE-29767
             Project: HBase
          Issue Type: Improvement
          Components: BlockCache
            Reporter: guluo


When we enable L2 Block cache, if we did not perform any scan, we may get the following logs.

INFO  [BucketCacheStatsExecutor] bucket.BucketCache: failedBlockAdditions=0, totalSize=98.19 MB, freeSize=98.18 MB, usedSize=15 KB, cacheSize=3.83 KB, accesses=12, hits=6, IOhitsPerSecond=0, {color:#FF0000}IOTimePerHit=NaN{color}, hitRatio=50.00%, cachingAccesses=12, cachingHits=6, cachingHitsRatio=50.00%, evictions=0, evicted=0, evictedPerRun=0.0, allocationFailCount=0

 

And we open UI of RegionServer, and would found the Time per Hit  also dispalys NaN



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