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https://issues.apache.org/jira/browse/HBASE-14439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14746393#comment-14746393
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Matteo Bertozzi commented on HBASE-14439:
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I opened the hbase-14439 branch and committed Ben's patch.
https://github.com/apache/hbase/tree/hbase-14439
I plan to do some experiment there and then have some official proposal here.
but the idea is to have an API that talks about Table, WAL, Region, Family and
Store Files and not FileSystem paths.
basically finishing up the work started on HBASE-7806/HBASE-7807, and have an
API ready for HBASE-14090
> New/Improved Filesystem Abstractions
> ------------------------------------
>
> Key: HBASE-14439
> URL: https://issues.apache.org/jira/browse/HBASE-14439
> Project: HBase
> Issue Type: New Feature
> Reporter: Ben Lau
> Assignee: Matteo Bertozzi
> Attachments: abstraction.patch
>
>
> Ticket for work in progress on new FileSystem abstractions. Previously, we
> (Yahoo) submitted a ticket that would add support for humongous (1 million
> region+) tables via a hierarchical layout (HBASE-13991). However open source
> is moving in a similar but not identical direction in the future and so the
> patch will not be merged into open source.
> We will be working with Cloudera on a different patch now. It will
> create/add to 2 layers-- a path abstraction layer and a use-oriented
> abstraction layer. The path abstraction layer is epitomized by classes like
> FsUtils (and in the patch new classes like AFsLayout). The use oriented
> abstraction layer is epitomized by existing classes like
> MasterFileSystem/HRegionFileSystem (and possibly new classes later) that
> build on the path abstraction layer and focus on 'doing things' (eg creating
> regions) and less on the gritty details like the paths.
> This work on abstracting and isolating the paths from the use cases will help
> Yahoo not diverge too much from open source with its internal 'Humongous'
> table hierarchical layout, while also helping open source move further
> towards the eventual goal of redoing the FS layout in a similar (but
> different) hierarchical layout later that focuses on data directory
> uniformity (unlike the humongous patch) and storing hierarchy in the meta
> table instead which enables new optimizations (see HBASE-14090.)
> Attached to this ticket is some work we've done at Yahoo so far that will be
> put into an open source HBase branch for further collaboration. The patch is
> not meant to be complete yet and is a work in progress. (Please wait on
> patch comments/reviews.) It also includes some Yahoo-specific 'humongous'
> layout code that will be removed before submission in open source.
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