Ben Lau created HBASE-14439:
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Summary: New Filesystem Abstraction Layer
Key: HBASE-14439
URL: https://issues.apache.org/jira/browse/HBASE-14439
Project: HBase
Issue Type: New Feature
Reporter: Ben Lau
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.
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 and storing
hierarchy in the meta table instead (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.)
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