Mechanism for providing version info of hadoop jars
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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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