hadoop 远程调试

1.设置服务器java vm的-agentlib:jdwp选项.
    [server]
    //windwos
    //set JAVA_OPTS=%JAVA_OPTS% -agentlib:jdwp=transport=dt_socket,address=8888,server=y,suspend=n
    
    //linux
    export HADOOP_CLIENT_OPTS=-agentlib:jdwp=transport=dt_socket,address=8888,server=y,suspend=y
    
    2.在server启动java程序
        hadoop jar HdfsDemo.jar com.it18zhang.hdfs.mr.compress.TestCompress

    3.server会暂挂在8888.
        Listening ...

    4.客户端通过远程调试连接到远程主机的8888.

        
    5.客户端就可以调试了。

在pom.xml中引入新的插件(maven-antrun-plugin),实现文件的复制.
-------------------------------------------------------------
	[pom.xml]
	<project>
		...
		<build>
			<plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-antrun-plugin</artifactId>
                <version>1.8</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>run</goal>
                        </goals>
                        <configuration>
                            <tasks>
                                <echo>---------开始复制jar包到共享目录下----------</echo>
                                <delete file="E:\shareCentos\hdfsExample-1.0-SNAPSHOT.jar"></delete>
                                <copy file="target\hdfsExample-1.0-SNAPSHOT.jar" toFile="E:\shareCentos\HdfsDemo.jar">
                                </copy>
                            </tasks>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
		</build>
		...
	</project>