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Posted to issues@hbase.apache.org by "guluo (Jira)" <ji...@apache.org> on 2025/12/10 11:15:00 UTC
[jira] [Updated] (HBASE-29767) Fix IOTimePerHit NaN issue in BucketCacheStats
[ https://issues.apache.org/jira/browse/HBASE-29767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
guluo updated HBASE-29767:
--------------------------
Description:
When L2 BlockCache is enabled and no scans have been performed, the logs may show the following output.
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
Additionally, when opening the RegionServer UI, the Time per Hit field may aslo display NaN.
was:
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
> 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
> Priority: Minor
>
> When L2 BlockCache is enabled and no scans have been performed, the logs may show the following output.
> 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
>
> Additionally, when opening the RegionServer UI, the Time per Hit field may aslo display NaN.
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