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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-8980) Assistant Store ----------- An Index Store of HRegion
Date Thu, 18 Jul 2013 08:06:48 GMT

     [ https://issues.apache.org/jira/browse/HBASE-8980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

chunhui shen updated HBASE-8980:
--------------------------------

    Attachment: 8980-94.patch
    
> Assistant Store ----------- An Index Store of HRegion
> -----------------------------------------------------
>
>                 Key: HBASE-8980
>                 URL: https://issues.apache.org/jira/browse/HBASE-8980
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: 8980-94.patch
>
>
> *Background*
> a.Generally, we would hope several organizations for the same data. e.g. Secondary Index
sortes the data from the non-primary key.
> b.Now, when we scanning the data on HBase with condition, like ValueFilter, its  efficiency
seems low
> c.We could create an Assistant Store to store the data with another organization for
the data of HRegion
> *Assistant Store*
> a.It's a store of HRegion, like HStore, could be created by user through adding ColumnFamliy
> b.Data in Assistant Store is the copy of data in HRegion, but using another organization
,One Exception is that its row could be not in the range of HRegion.
> For example, 
> The region(Range:'row001'~'row999') includes the following KVs in the Store cf:
> row001/cf:q1/val001
> row002/cf:q1/val002
> row003/cf:q1/val003
> we could create an Assistant Store(named as) for the region which includes the following
KVs:
> val001/cf:q1/row001
> val002/cf:q1/row002
> val003/cf:q1/row003
> c.We could use local region transaction to ensure the Atomicity and Consistency
> *Implementation Dependency*
> a.Split the StoreFile as value.(Now,we just split the file as row)
> b.Support multi-row transaction in region (Alreadt implemented)
> Providing an initial patch on 0.94 version. 
> What do you think about such a Store.

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