hadoop的classpath设置在哪里 [英] Where is the classpath set for hadoop

问题描述

hadoop的classpath在哪里设置？
当我运行下面的命令时，它给了我类路径。 classpath设置在哪里？

  bin / hadoop classpath 
  

我使用hadoop 2.6.0

解决方案

shaikh设置在 hadoop-config.sh 中，但是您可以在 hadoop-env.sh 中添加更多jar。

以下是 hadoop-env.sh 中的相关代码，它添加了容量调度程序和aws jar's 。

  export HADOOP_CONF_DIR = $ {HADOOP_CONF_DIR： - / etc / hadoop} 
 
＃Extra Java CLASSPATH元素。自动插入容量调度程序。 
 for $ HADOOP_HOME / contrib / capacity-scheduler / *。jar;如果[$ HADOOP_CLASSPATH]执行
;然后
 export HADOOP_CLASSPATH = $ HADOOP_CLASSPATH：$ f 
 else 
 export HADOOP_CLASSPATH = $ f 
 fi 
完成
 
＃...一些其他行省略
 
＃添加Aws jar 
 export HADOOP_CLASSPATH = $ HADOOP_CLASSPATH：share / hadoop / tools / lib / * 
  

Where is the classpath for hadoop set? When I run the below command it gives me the classpath. Where is the classpath set?

  bin/hadoop classpath

I'm using hadoop 2.6.0

解决方案

As said by almas shaikh it's set in hadoop-config.sh, but you could add more jars to it in hadoop-env.sh

Here is a relevant code from hadoop-env.sh which adds additional jars like capacity-scheduler and aws jar's.

export HADOOP_CONF_DIR=${HADOOP_CONF_DIR:-"/etc/hadoop"}

# Extra Java CLASSPATH elements.  Automatically insert capacity-scheduler.
for f in $HADOOP_HOME/contrib/capacity-scheduler/*.jar; do
  if [ "$HADOOP_CLASSPATH" ]; then
    export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$f
  else
    export HADOOP_CLASSPATH=$f
  fi
done

# ... some other lines omitted

# Add Aws jar
export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:share/hadoop/tools/lib/*

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