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https://issues.apache.org/jira/browse/HBASE-9203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13860165#comment-13860165
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rajeshbabu commented on HBASE-9203:
-----------------------------------
[[email protected]] Thanks for review.
bq. In figure CreateTableWithSplits, there is an arrow from CreateTableHandler
to IndexMasterObserver labeled CreateIndexTableCameout. I don't find such
callback in the patch. What does the arrow represent ?
Just wanted to represent coming back to IndexMasterObserver from
CreateTableHandler. There are no such call backs in the code, the arrow should
start from CreateTableHandler(by mistake drawn from HMaster).
bq. Can you explain the second sentence in more detail ?
Since the rowkey for the index table put is like this
{code}
startkey of index region + index name + indexed column(s) value(s) + user table
rowkey
{code}
The last two bytes represents starting position of actual rowkey.
bq. IndexLoadIncrementalHFile is the utility that does the loading into index
table.
Yes it should be IndexLoadIncrementalHFile utility. Nice catch Ted.
bq. Is IndexTsvImporterMapper this new class ?
Yes its IndexTsvImporterMapper. It will be used to prepare puts for both user
table index table from raw data.
IndexCreationMapper will be used to prepare index table puts from user table
data. I will add javadoc.
bq. there is a dummy CF under .indexTable directory. What's its purpose ?
Actually it's column family in index table name. Didn't decide the name at that
time so given some name.
> 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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