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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8597) FsShell's Text command should be able to read avro data files
Date Mon, 10 Sep 2012 22:08:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452506#comment-13452506
] 

Hadoop QA commented on HADOOP-8597:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12544535/HADOOP-8597.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 1 new or modified test files.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/1429//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/1429//console

This message is automatically generated.
                
> FsShell's Text command should be able to read avro data files
> -------------------------------------------------------------
>
>                 Key: HADOOP-8597
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8597
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs
>    Affects Versions: 2.0.0-alpha
>            Reporter: Harsh J
>            Assignee: Ivan Vladimirov Ivanov
>              Labels: newbie
>         Attachments: HADOOP-8597-2.patch, HADOOP-8597.patch, HADOOP-8597.patch, HADOOP-8597.patch
>
>
> Similar to SequenceFiles are Apache Avro's DataFiles. Since these are getting popular
as a data format, perhaps it would be useful if {{fs -text}} were to add some support for
reading it, like it reads SequenceFiles. Should be easy since Avro is already a dependency
and provides the required classes.
> Of discussion is the output we ought to emit. Avro DataFiles aren't simple as text, nor
have they the singular Key-Value pair structure of SequenceFiles. They usually contain a set
of fields defined as a record, and the usual text emit, as available from avro-tools via http://avro.apache.org/docs/current/api/java/org/apache/avro/tool/DataFileReadTool.html,
is in proper JSON format.
> I think we should use the JSON format as the output, rather than a delimited form, for
there are many complex structures in Avro and JSON is the easiest and least-work-to-do way
to display it (Avro supports json dumping by itself).

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