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Posted to issues@hbase.apache.org by "Doug Meil (JIRA)" <ji...@apache.org> on 2011/08/07 00:37:27 UTC
[jira] [Assigned] (HBASE-4089) blockCache contents report
[ https://issues.apache.org/jira/browse/HBASE-4089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Doug Meil reassigned HBASE-4089:
--------------------------------
Assignee: Doug Meil
> 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: Doug Meil
> Attachments: hbase_4089_blockcachereport.pdf
>
>
> 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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