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https://issues.apache.org/jira/browse/HBASE-11229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-11229:
--------------------------
Release Note:
Renames metric "blockCountHitPercent" as "blockCacheCountHitPercent". Changes
this metrics type from int to double.
Small changes in this metric can have significant impact serving. While this
metric may show 99.xx percent, most of the cache hits are because we are
fetching index and bloom blocks. A significant percentage of data block
evictions may only register as a small change in this metric. Keep an eye on
evictions as well changes (even if small) in this metric.
Hadoop Flags: Incompatible change
> Change block cache percentage metrics to be doubles rather than ints
> --------------------------------------------------------------------
>
> Key: HBASE-11229
> URL: https://issues.apache.org/jira/browse/HBASE-11229
> Project: HBase
> Issue Type: Sub-task
> Components: metrics
> Reporter: stack
> Assignee: stack
> Fix For: 0.99.0
>
> Attachments: 11229.txt
>
>
> See parent issue. Small changes in the hit percentage can have large
> implications, even when movement is inside a single percent: i.e. going from
> 99.11 to 99.87 percent. As is, percents are ints. Make them doubles.
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