解决：Server IPC version 9 cannot communicate with client version 4

时间：2021-04-04 21:42:53

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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