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https://issues.apache.org/jira/browse/HBASE-17738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16006253#comment-16006253
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Anoop Sam John commented on HBASE-17738:
----------------------------------------

So we can do similar checking against max direct memory setting?  We do set 
this from our start scripts any way.  When unsafe is not available we should 
have a way to do the things.  We will copy the relevant code parts from OHC or 
use their library? Copy is ok may be.  License seems fine.

> BucketCache startup is slow
> ---------------------------
>
>                 Key: HBASE-17738
>                 URL: https://issues.apache.org/jira/browse/HBASE-17738
>             Project: HBase
>          Issue Type: Sub-task
>          Components: BucketCache
>    Affects Versions: 2.0.0
>            Reporter: stack
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17738_2.patch, HBASE-17738_2.patch, 
> HBASE-17738_3.patch, HBASE-17738.patch
>
>
> If you set bucketcache size at 64G say and then start hbase, it takes a long 
> time. Can we do the allocations in parallel and not inline with the server 
> startup?
> Related, prefetching on a bucketcache is slow. Speed it up.



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