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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17738) BucketCache startup is slow
Date Mon, 22 May 2017 07:37:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16019231#comment-16019231
] 

Anoop Sam John commented on HBASE-17738:
----------------------------------------

We need one of the possible 2 solutions only right?  Either make multi threaded DBB creation
using java nio APIs or go via Unsafe way (There do we need multi thread)?  
I think u raised concern over the 2nd way regarding size check.  So 1st way might be enough
provided it can greatly reduced the time required to start up BC with larger size like 100s
of GB

> 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_4.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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