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https://issues.apache.org/jira/browse/HBASE-13991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14615813#comment-14615813
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Ben Lau commented on HBASE-13991:
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Hi guys, hope you had a happy 4th of July.
We would like to do something akin to Lars’ last idea. That is, we will have
code to support both the old layout and the new layout, but it will be on a per
HBase cluster basis. You will be able to migrate a cluster entirely to the
hierarchical layout or leave it on the old layout.
This approach has the following pros:
- If HBase users do not need/want the new layout, they will not have to do an
offline upgrade in order to use new HBase code. The alternative is to make an
online upgrade for the hierarchical layout, but this would require some very
messy changes to the codebase and also be tricky to test fully.
- HBase code will not have to ‘detect’ whether tables/paths/regions are
hierarchical or not. The master or region server can simply look at the root
table at startup and use that to determine if the cluster has migrated to the
hierarchical layout. This single source of truth would make code less ugly
since you don’t need to do in-context per-region/path checks in different parts
of the codebase.
What do you guys think about this approach?
> Hierarchical Layout for Humongous Tables
> ----------------------------------------
>
> Key: HBASE-13991
> URL: https://issues.apache.org/jira/browse/HBASE-13991
> Project: HBase
> Issue Type: Sub-task
> Reporter: Ben Lau
> Assignee: Ben Lau
> Attachments: HBASE-13991-master.patch, HumongousTableDoc.pdf
>
>
> Add support for humongous tables via a hierarchical layout for regions on
> filesystem.
> Credit for most of this code goes to Huaiyu Zhu.
> Latest version of the patch is available on the review board:
> https://reviews.apache.org/r/36029/
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