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https://issues.apache.org/jira/browse/HBASE-18532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16118847#comment-16118847
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Biju Nair commented on HBASE-18532:
-----------------------------------
The L1 and L2 cache stats are populated using
[o.a.h.hbase.io.hfile.BlockCacheUtil.CachedBlocksByFile|https://github.com/apache/hbase/blob/rel/1.1.2/hbase-server/src/main/jamon/org/apache/hadoop/hbase/tmpl/regionserver/BlockCacheTmpl.jamon#L300]
which in turn has a limit on the number of blocks which is set to
[100000|https://github.com/apache/hbase/blob/rel/1.1.2/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.java#L191].
This seems to be causing the mismatch.
Also is there a reason we are listing the 100K BC Bucket details on the UI.
Does it help in any way?
> Improve cache related stats rendered on RS UI
> ---------------------------------------------
>
> Key: HBASE-18532
> URL: https://issues.apache.org/jira/browse/HBASE-18532
> Project: HBase
> Issue Type: Improvement
> Components: regionserver, UI
> Affects Versions: 1.1.2
> Reporter: Biju Nair
> Attachments: COMBINED-STATS.PNG, L1-STATS.PNG, L2-STATS.PNG
>
>
> The stats currently rendered for L1 and L2 cache are incorrect. Refer to the
> attached screenshots of stats from a cluster showing the combined cache
> stats, L1 stats and L2 stats. For e.g. the combined stats shows 38 GB used
> for cache while if we sum size of L1 and L2 cache the value is way less. One
> way we can improve this is to use the same stats used to populate the
> combined stats to render the values of L1 & L2 cache. Also for usability we
> can remove the table with details with BucketCache buckets from the L2 cache
> stats since this is going to be long for any installation using L2 cache.
> This will help in understanding the cache usage better. Thoughts? If there
> are no concerns will submit a patch.
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