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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7404) Bucket Cache:A solution about CMS,Heap Fragment and Big Cache on HBASE
Date Fri, 21 Dec 2012 02:33:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13537633#comment-13537633
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chunhui shen commented on HBASE-7404:
-------------------------------------

[~andrew.purtell@gmail.com]
bq.Second to last slide is results of "heap" engine tests, correct?
Yes, it use "heap" engine.
We have studied and test SlabCache first, but I think the result is bad, because:
1.SlabCache use SingleSizeCache, its use ratio of memory is low because kinds of block size,
especially using DataBlockEncoding 
2.SlabCache is uesd in DoubleBlockCache, block is cached both in SlabCache and LruBlockCache,
put the block to LruBlockCache again if hit in SlabCache , it causes CMS and heap fragment
don't get any better
3.Direct heap performance is not good as heap, and maybe cause OOM, so we doesn't do a test
on "offheap" engine 
                
> Bucket Cache:A solution about CMS,Heap Fragment and Big Cache on HBASE
> ----------------------------------------------------------------------
>
>                 Key: HBASE-7404
>                 URL: https://issues.apache.org/jira/browse/HBASE-7404
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.94.3
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>             Fix For: 0.96.0, 0.94.5
>
>         Attachments: BucketCache.pdf, hbase-7404-0.94v1.patch, hbase-7404-trunkv1.patch
>
>
> First, thanks @neil from Fusion-IO share the source code.
> What's Bucket Cache? 
> It could greatly decrease CMS and heap fragment by GC
> It support a large cache space for High Read Performance by using high speed disk like
Fusion-io
> 1.An implementation of block cache like LruBlockCache
> 2.Self manage blocks' storage position through Bucket Allocator
> 3.The cached blocks could be stored in the memory or file system
> 4.Bucket Cache could be used as a mainly block cache(see CombinedBlockCache), combined
with LruBlockCache to decrease CMS and fragment by GC.
> 5.BucketCache also could be used as a secondary cache(e.g. using Fusionio to store block)
to enlarge cache space
> See more in the attachment and in the patch

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