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