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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9203) Secondary index support through coprocessors
Date Thu, 02 Jan 2014 05:05:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13860016#comment-13860016

Ted Yu commented on HBASE-9203:

bq. First 2 bytes is the length of the start key of the index region and last 2 bytes is the
offset to the actual table’s rowkey within the index rowkey.
Can you explain the second sentence in more detail ?

In section 5:
bq. LoadIncrementalHFiles utility can be used for this.
IndexLoadIncrementalHFile is the utility that does the loading into index table.

For section 6. Bulk load data to indexed table:
bq. Create a new mapper class which
Is IndexTsvImporterMapper this new class ? There is another mapper, IndexCreationMapper, in
the patch. Neither of them has class javadoc.
In the figure for section 6, there is a dummy CF under .indexTable directory. What's its purpose

> Secondary index support through coprocessors
> --------------------------------------------
>                 Key: HBASE-9203
>                 URL: https://issues.apache.org/jira/browse/HBASE-9203
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: rajeshbabu
>            Assignee: rajeshbabu
>         Attachments: SecondaryIndex Design.pdf, SecondaryIndex Design_Updated.pdf
> We have been working on implementing secondary index in HBase and open sourced  on hbase
0.94.8 version.
> The project is available on github.
> https://github.com/Huawei-Hadoop/hindex
> This Jira is to support secondary index on trunk(0.98).
> Following features will be supported.
> -          multiple indexes on table,
> -          multi column index,
> -          index based on part of a column value,
> -          equals and range condition scans using index, and
> -          bulk loading data to indexed table (Indexing done with bulk load)
> Most of the kernel changes needed for secondary index is available in trunk. Very minimal
changes needed for it.

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