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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9629) Support Azure Blob Storage as a file system in Hadoop
Date Fri, 07 Jun 2013 19:32:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678340#comment-13678340

Hadoop QA commented on HADOOP-9629:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 26 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated 4 warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 4 new Findbugs (version
1.3.9) warnings.

        {color:red}-1 release audit{color}.  The applied patch generated 2 release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/2617//testReport/
Release audit warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/2617//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/2617//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-common.html
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/2617//console

This message is automatically generated.
> 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
>         Attachments: HADOOP-9629.patch
> 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
> 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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