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https://issues.apache.org/jira/browse/HBASE-6312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405657#comment-13405657
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Jason Dai commented on HBASE-6312:
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Yes, this is also mentioned in the HBase BoF presentation by Jean-Daniel Cryans 
at http://www.slideshare.net/jdcryans/performance-bof12
                
> Make BlockCache eviction thresholds configurable
> ------------------------------------------------
>
>                 Key: HBASE-6312
>                 URL: https://issues.apache.org/jira/browse/HBASE-6312
>             Project: HBase
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 0.94.0
>            Reporter: Jie Huang
>            Priority: Minor
>         Attachments: hbase-6312.patch
>
>
> Some of our customers found that tuning the BlockCache eviction thresholds 
> made test results different in their test environment. However, those 
> thresholds are not configurable in the current implementation. The only way 
> to change those values is to re-compile the HBase source code. We wonder if 
> it is possible to make them configurable.

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