maven在Idea建立工程,运行出现Server IPC version 9 cannot communicate with client version 4错误
2018-02-12 11:07
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问题的根源在于,工程当中maven dependencies里面的包,有个hadoop-core的包,版本太低,这样,程序里面所有引用到org.apache.hadoop的地方,都是低版本的,你用的是maven3的话,默认是hadoop-core-1.2.1.jar,这个就是那个“ipc client version4”, 而一般情况下你的电脑里运行的hadoop都是2.x,显然版本不对,于是我就想办法修改这个,但是maven装上之后就不能随便改里面的包,折腾半天之后,发现只能通过工程的pom.xml文件来改,在这个里面改了之后,maven dependencies里面的包它自然会下载更改。
但问题是,maven independencies里面的包,并不是所有的hadoop版本都包含,例如hadoop-core最高的版本就是1.2.1, 这可要吓死宝宝了,难道说,要运行maven就只能用低版本的hadoop吗?显然不可能,一定是有其他的原因,突然看到一个帖子,绕过hadoop-core,设置了别的属性,比如hadoop-hdfs等属性,这些属性的最高版本已经到了2.5.1了这样一来,就不会报错了,大功告成,我的pom.xml文件是这么设置的:
原先我是没有设置hadoop-common、hadoop-hdfs、hadoop-client这三个,而是写了个:
但问题是,maven independencies里面的包,并不是所有的hadoop版本都包含,例如hadoop-core最高的版本就是1.2.1, 这可要吓死宝宝了,难道说,要运行maven就只能用低版本的hadoop吗?显然不可能,一定是有其他的原因,突然看到一个帖子,绕过hadoop-core,设置了别的属性,比如hadoop-hdfs等属性,这些属性的最高版本已经到了2.5.1了这样一来,就不会报错了,大功告成,我的pom.xml文件是这么设置的:
<dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>2.8.3</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-hdfs</artifactId> <version>2.8.3</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>2.8.3</version> </dependency>
原先我是没有设置hadoop-common、hadoop-hdfs、hadoop-client这三个,而是写了个:
<groupId>org.apache.hadoop</groupId> <artifactId>hadoop-core</artifactId> <version>1.2.1</version> </dependency>
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