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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7368) Mechanism for providing version info of hadoop jars
Date Fri, 10 Jun 2011 17:17:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13047301#comment-13047301
] 

Alejandro Abdelnur commented on HADOOP-7368:
--------------------------------------------

IMO, the current mechanism brings obscurity/complexity to the build process.

And if you open a JAR, replace a file, and reJAR, then you know you are doing something funny.
(And you could do that with the annotation class as well)



> Mechanism for providing version info of hadoop jars
> ---------------------------------------------------
>
>                 Key: HADOOP-7368
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7368
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: build
>    Affects Versions: 0.23.0
>            Reporter: Luke Lu
>            Assignee: Luke Lu
>             Fix For: 0.23.0
>
>
> In 0.20.x, only one jar (hadoop-core-*.jar) really matters. The o.a.h.util.VersionInfo
combined with saveVersion.sh script (generating a package level annotation) served us well.
For 0.23+, due to the project split and modularization of mapreduce (currently in MR-279),
a lot more essential hadoop jars are created. The potential of mixing up the jars is significantly
increased as well. We need a simple way to list the version info (version, branch, source
checksum etc.) for all the jars involved. This is essential for QE and tracking down various
issues.
> I propose that we use a VersionProvider interface (similar to the current VersionInfo
util class) and ServiceLoader to enumerate the version providers in the jars.
> {code}
> public interface VersionProvider {
>   String getJar(); 
>   String getPackage();
>   String getVersion();
>   String getRevision();
>   String getBranch();
>   String getDate();
>   String getUrl();
>   String getSourceChecksum();
> }
> {code}

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