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