Mostafa Elhemali created HADOOP-9629:
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Summary: Support Azure Blob Storage as a file system in Hadoop
Key: HADOOP-9629
URL: https://issues.apache.org/jira/browse/HADOOP-9629
Project: Hadoop Common
Issue Type: Improvement
Reporter: Mostafa Elhemali
Assignee: Mostafa Elhemali
h2. Description
This JIRA incorporates adding a new file system implementation for accessing
Windows Azure Blob storage from within Hadoop, such as using blobs as input to
MR jobs or configuring MR jobs to put their output directly into blob storage.
h2. High level design
At a high level, the code here extends the FileSystem class to provide an
implementation for accessing blob storage; the scheme asv is used for accessing
it over HTTP, and asvs for accessing over HTTPS. We use the URI scheme:
{code}asv[s]://<container>@<account>/path/to/file{code} to address individual
blobs. We use the standard Azure Java SDK (com.microsoft.windowsazure) to do
most of the work. In order to map a hierarchical file system over the flat
name-value pair nature of blob storage, we create a specially tagged blob named
path/to/dir whenever we create a directory called path/to/dir, then files under
that are stored as normal blobs path/to/dir/file. We have many metrics
implemented for it using the Metrics2 interface. Tests are implemented mostly
using a mock implementation for the Azure SDK functionality, with an option to
test against a real blob storage if configured (instructions provided inside in
RunningLiveAsvTests.txt).
h2. Credits and history
This has been ongoing work for a while, and the early version of this work can
be seen in HADOOP-8079. This JIRA is a significant revision of that and we'll
post the patch here for Hadoop trunk first, then post a patch for branch-1 as
well for backporting the functionality if accepted. Credit for this work goes
to the early team: Min Wei, David Lao, Lengning Liu and Alexander Stojanovic as
well as multiple people who have taken over this work since then (hope I don't
forget anyone): Dexter Bradshaw, Johannes Klein, Ivan Mitic, Michael Rys and
Mostafa Elhemali.
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