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https://issues.apache.org/jira/browse/HBASE-4089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030923#comment-14030923
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stack commented on HBASE-4089:
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bq. Does this JIRA address or relate to
https://issues.apache.org/jira/browse/HBASE-8315?
[~misty] It does with some minor mods commtted against HBASE-8315
> blockCache contents report
> --------------------------
>
> Key: HBASE-4089
> URL: https://issues.apache.org/jira/browse/HBASE-4089
> Project: HBase
> Issue Type: New Feature
> Reporter: Doug Meil
> Assignee: stack
> Fix For: 0.99.0
>
> Attachments: 4089.wip.txt, 4089.wip.v2.txt, 4089v3.txt, 4089v4.txt,
> 4089v6.txt, 4089v7.txt, 4089v7.txt, 4089v8.txt, bc_basic.png,
> bc_bucketcache.png, bc_buckets.png, bc_config.png, bc_l1.png,
> bc_l2_buckets.png, bc_showing_buckets_start.png, bc_slabs.png, bc_slabs.png,
> bc_stats.png, hbase_4089_blockcachereport.pdf,
> java_blockcache_checkpoint_2011_08_11.patch
>
>
> Summarized block-cache report for a RegionServer would be helpful. For
> example ...
> table1
> cf1 100 blocks, totalBytes=yyyyy, averageTimeInCache=XXXX hours
> cf2 200 blocks, totalBytes=zzzzz, averageTimeInCache=XXXX hours
> table2
> cf1 75 blocks, totalBytes=yyyyy, averageTimeInCache=XXXX hours
> cf2 150 blocks, totalBytes=zzzzz, averageTimeInCache=XXXX hours
> ... Etc.
> The current metrics list blockCacheSize and blockCacheFree, but there is no
> way to know what's in there. Any single block isn't really important, but
> the patterns of what CF/Table they came from, how big are they, and how long
> (on average) they've been in the cache, are important.
> No such interface exists in HRegionInterface. But I think it would be
> helpful from an operational perspective.
> Updated (7-29): Removing suggestion for UI. I would be happy just to get
> this report on a configured interval dumped to a log file.
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