java - org.apache.maven.plugin.MojoExecutionException : protoc failure

Question

我在使用maven从源代码编译hadoop时遇到了一些问题。这是错误，任何人都可以帮助我吗？谢谢。

[ERROR] Failed to execute goal org.apache.hadoop:hadoop-maven-plugins:3.0.0-SNAPSHOT:protoc (compile-protoc) on project hadoop-c
 [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.hadoop:hadoop-maven-plugins:3.0.0-SNAP
plugin.MojoExecutionException: protoc failure
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: org.apache.maven.plugin.MojoExecutionException: protoc failure
        at org.apache.hadoop.maven.plugin.protoc.ProtocMojo.execute(ProtocMojo.java:81)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 19 more
**Caused by: org.apache.maven.plugin.MojoExecutionException: protoc failure**
        at org.apache.hadoop.maven.plugin.protoc.ProtocMojo.execute(ProtocMojo.java:78)
        ... 21 more
[ERROR]
[ERROR]

Answer 1

说明位于 http://wiki.apache.org/hadoop/HowToContribute解释构建 hadoop 的一些不太明显的方面——包括这一方面。 这里的主要问题是 hadoop 的 YARN 框架需要 Protocol Buffer ，而您很可能没有安装它们。

看来问题可能出在您没有正确解释错误，所以——

如何隔离构建错误

任何失败的 mojo 都应该与一个类相关联。

在这种情况下，失败的原因就在这里:

https://svn.apache.org/repos/asf/hadoop/common/trunk/hadoop-maven-plugins/src/main/java/org/apache/hadoop/maven/plugin/protoc/ProtocMojo.java

查看代码，很明显这个 Mojo 需要“protoc”程序才能运行。

http://code.google.com/p/protobuf/

解决方案

要构建 hadoop，您需要 Protocol Buffer 。这可以通过运行以下命令从 googlecode(取自 http://numbers.brighterplanet.com/2012/04/14/how-to-install-mosh-on-amazon-ec2/ )获取代码，从源代码安装在 *NIX 机器上。

wget http://protobuf.googlecode.com/files/protobuf-2.4.1.tar.gz
tar xzf protobuf-2.4.1.tar.gz
cd protobuf-2.4.1
./configure
make
sudo make install
sudo ldconfig