[jira] [Created] (HBASE-8980) Assistant Store ----------- An Index Store of HRegion

["chunhui shen (JIRA)" <ji...@apache.org>]

chunhui shen created HBASE-8980:
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             Summary: 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


*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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