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https://issues.apache.org/jira/browse/HBASE-15240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15145477#comment-15145477
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Andrew Purtell commented on HBASE-15240:
----------------------------------------

And best effort / background fetch is intended, so even though we want 
preloading we are not overrunning IO bandwidth with that activity along with 
other reading and writing. I think some of this is discussed on the issue that 
introduced it, in the discussion there 

> Go Big BucketCache Fixes
> ------------------------
>
>                 Key: HBASE-15240
>                 URL: https://issues.apache.org/jira/browse/HBASE-15240
>             Project: HBase
>          Issue Type: Umbrella
>          Components: BucketCache
>            Reporter: stack
>            Assignee: stack
>         Attachments: Screen Shot 2016-02-10 at 6.27.26 AM.png
>
>
> Umbrella issue to which we will attach issues that prevent bucketcache going 
> big; there's a few.



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