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https://issues.apache.org/jira/browse/HADOOP-8535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402470#comment-13402470
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Jonathan Eagles commented on HADOOP-8535:
-----------------------------------------
http://jira.codehaus.org/browse/PLXCOMP-202 is the JIRA that added the
JavacCompiler classloader cache.
The build command I executed was
mvn clean install -Pdist -Dtar -DskipTests -Dmaven.javadoc.skip
which was performed with an empty .m2 cache (nexus enabled) and a clean git
repo at the top level.
Without Path
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5:06.711s
[INFO] Finished at: Wed Jun 27 13:36:54 CDT 2012
[INFO] Final Memory: 334M/455M
[INFO] ------------------------------------------------------------------------
With Patch
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2:15.486s
[INFO] Finished at: Wed Jun 27 13:29:18 CDT 2012
[INFO] Final Memory: 70M/272M
[INFO] ------------------------------------------------------------------------
> Cut hadoop build times in half (upgrade maven-compiler-plugin to 2.5.1)
> -----------------------------------------------------------------------
>
> Key: HADOOP-8535
> URL: https://issues.apache.org/jira/browse/HADOOP-8535
> Project: Hadoop Common
> Issue Type: Improvement
> Components: build
> Affects Versions: 0.23.3, 2.0.1-alpha
> Reporter: Jonathan Eagles
> Assignee: Jonathan Eagles
> Attachments: HADOOP-8535.patch
>
>
> starting with 2.4.0 maven-compiler-plugin started caching the class loader
> for the javac compiler. This patch upgrades the compiler to 2.5.1. On my box,
> build times are reduced from 5 minutes to 2 minutes.
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