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https://issues.apache.org/jira/browse/HBASE-8315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Misty Stanley-Jones reassigned HBASE-8315:
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Assignee: Misty Stanley-Jones
> Documentation should have more information of LRU Stats
> -------------------------------------------------------
>
> Key: HBASE-8315
> URL: https://issues.apache.org/jira/browse/HBASE-8315
> Project: HBase
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 0.95.0
> Reporter: Daisuke Kobayashi
> Assignee: Misty Stanley-Jones
> Labels: documentation
>
> Unfortunately, there's no documentation to explain the meaning of each LRU
> Stats in the regionserver logs. So this is for creating a new paragraph
> regarding this. My current idea is below, but it's a little bit difficult to
> explain the difference between 'cachingAccesses' and 'accesses' from an
> administrator or a user views.
> Could you guys help to improve the content?
> {noformat}
> total: The current memory size of the cache in use.
> free: The total free memory currently available to store more cache entries.
> max: Maximum allowed memory size of the cache.
> blocks: Caches store blocks of data; this number is the current # of blocks
> stored, which use up the "total" memory space.
> accesses: The total number of times the cache was accessed, regardless of
> result.
> hits: The total number of times the cache was accessed and the result was a
> successful hit (presence of looked up element in cache is a hit).
> hitRatio: The current percentage for "hits / accesses".
> ====
> Unclear:
> cachingAccesses: cachingHits + The number of getBlock requests that were
> cache misses, but only from requests that were set to use the block cache.
> cachingHits: The number of getBlock requests that were cache hits, but only
> from requests that were set to use the block cache. This is because all reads
> =====
> cachingHitsRatio: The current percentage for "cachintHits / cachingAccesses"
> evictions: The total number of times an eviction has occurred (based on the
> use of the LRU algorithm)
> evicted: The total number of blocks that have been evicted (based on the use
> of the LRU algorithm)
> evictedPerRun: The total number of blocks that have been evicted overall /
> The number of times an eviction has occurred overall
> {noformat}
> And also, where should we add this paragraph in the documentation?
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