[jira] [Updated] (HADOOP-12761) incremental maven build is not really incremental

["Sangjin Lee (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-12761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sangjin Lee updated HADOOP-12761:
---------------------------------
    Attachment: HADOOP-12761.01.patch

Posted patch v.1.

> incremental maven build is not really incremental
> -------------------------------------------------
>
>                 Key: HADOOP-12761
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12761
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 2.7.2
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>            Priority: Minor
>         Attachments: HADOOP-12761.01.patch
>
>
> For any version that uses v.3.1 of the maven-compiler-plugin, the incremental maven build is basically broken. For most of the modules, an incremental build ({{mvn install -DskipTests}} on an already built directory for example) rebuilds the whole module again:
> {noformat}
> [INFO] ------------------------------------------------------------------------
> [INFO] Building Apache Hadoop Common 3.0.0-SNAPSHOT
> [INFO] ------------------------------------------------------------------------
> [INFO] 
> [INFO] --- maven-antrun-plugin:1.7:run (create-testdirs) @ hadoop-common ---
> [INFO] Executing tasks
> main:
> [INFO] Executed tasks
> [INFO] 
> [INFO] --- hadoop-maven-plugins:3.0.0-SNAPSHOT:protoc (compile-protoc) @ hadoop-common ---
> [INFO] No changes detected in protoc files, skipping generation.
> [INFO] 
> [INFO] --- hadoop-maven-plugins:3.0.0-SNAPSHOT:version-info (version-info) @ hadoop-common ---
> [WARNING] [svn, info] failed with error code 1
> [INFO] SCM: GIT
> [INFO] Computed MD5: c8e92ce138fcd723204649e4d7c6ddd
> [INFO] 
> [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ hadoop-common ---
> [INFO] Using 'UTF-8' encoding to copy filtered resources.
> [INFO] Copying 7 resources
> [INFO] Copying 1 resource
> [INFO] 
> [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ hadoop-common ---
> [INFO] Changes detected - recompiling the module!
> [INFO] Compiling 871 source files to /Users/foo/hadoop/hadoop-common-project/hadoop-common/target/classes
> {noformat}
> It turns out that the incremental build feature of the maven compiler plugin is basically broken at v3.1 (see http://stackoverflow.com/questions/17944108/maven-compiler-plugin-always-detecting-a-set-of-sources-as-stale and MCOMPILER-209). Ironically, this can be fixed by turning off the "incremental build" configuration of the plugin.



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