解决:Server IPC version 9 cannot communicate with client version 4
使用idea的maven项目运行mapreduce程序Server IPC version 9 cannot communicate with client version 4
原因:
Java初始化hdfs client时出现的,原因是maven依赖的版本和hdfs的版本不一致
maven仓库中的hadoop-core最高只有1.2.1版本, 不能加这个配置, 使用hadoop-common + hadoop-hdfs + hadoop-client的2.7.1版本即可
我的pom文件:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>hadoop01</groupId> <artifactId>hadoop01</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <!--<dependency>--> <!--<groupId>org.apache.hadoop</groupId>--> <!--<artifactId>hadoop-core</artifactId>--> <!--<version>1.2.1</version>--> <!--</dependency>--> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>2.7.1</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-hdfs</artifactId> <version>2.7.1</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>2.7.1</version> </dependency> </dependencies> <build> <plugins> <plugin> <artifactId>maven-dependency-plugin</artifactId> <configuration> <excludeTransitive>false</excludeTransitive> <stripVersion>true</stripVersion> <outputDirectory>./lib</outputDirectory> </configuration> </plugin> </plugins> </build> </project>
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