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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7368) Mechanism for providing version info of hadoop jars
Date Wed, 08 Jun 2011 21:23:58 GMT
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.
public interface VersionProvider {
  String getJar(); 
  String getPackage();
  String getVersion();
  String getRevision();
  String getBranch();
  String getDate();
  String getUrl();
  String getSourceChecksum();

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