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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9629) Support Windows Azure Storage - Blob as a file system in Hadoop
Date Thu, 11 Sep 2014 21:12:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130726#comment-14130726
] 

Hadoop QA commented on HADOOP-9629:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12649459/HADOOP-9629.trunk.5.patch
  against trunk revision c656d7d.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/4701//console

This message is automatically generated.

> Support Windows Azure Storage - Blob as a file system in Hadoop
> ---------------------------------------------------------------
>
>                 Key: HADOOP-9629
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9629
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: tools
>            Reporter: Mostafa Elhemali
>            Assignee: Chris Nauroth
>             Fix For: 3.0.0
>
>         Attachments: HADOOP-9629 - Azure Filesystem - Information for developers.docx,
HADOOP-9629 - Azure Filesystem - Information for developers.pdf, HADOOP-9629.2.patch, HADOOP-9629.3.patch,
HADOOP-9629.patch, HADOOP-9629.trunk.1.patch, HADOOP-9629.trunk.2.patch, HADOOP-9629.trunk.3.patch,
HADOOP-9629.trunk.4.patch, HADOOP-9629.trunk.5.patch
>
>
> h2. Description
> This JIRA incorporates adding a new file system implementation for accessing Windows
Azure Storage - Blob 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 wasb is used for accessing it over HTTP, and wasbs
for accessing over HTTPS. We use the URI scheme: {code}wasb[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
README.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: [~minwei], [~davidlao], [~lengningliu]
and [~stojanovic] as well as multiple people who have taken over this work since then (hope
I don't forget anyone): [~dexterb], Johannes Klein, [~ivanmi], Michael Rys, [~mostafae], [~brian_swan],
[~mikelid], [~xifang], and [~chuanliu].
> h2. Test
> Besides unit tests, we have used WASB as the default file system in our service product.
(HDFS is also used but not as default file system.) Various different customer and test workloads
have been run against clusters with such configurations for quite some time. The current version
reflects to the version of the code tested and used in our production environment.



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