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https://issues.apache.org/jira/browse/HBASE-29767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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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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