java - 带有openjdk的Hadoop:start-dfs.sh(SSH？)错误

Question

在this tutorial之后设置4个集群hadoop体系结构时遇到了问题。我有以下4台计算机(虚拟):

主节点

node1

node2

node3

我在主节点上设置了所有的conf文件，并使用scp将它们导出到其他文件。主节点可以通过ssh访问从节点。我在所有计算机上的.bashrc中设置了JAVA_HOME。但是，这就是我得到的:

hadoop@master-node:~$ start-dfs.sh
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.hadoop.security.authentication.util.KerberosUtil (file:/home/hadoop/hadoop/share/hadoop/common/lib/hadoop-auth-2.8.4.jar) to method sun.security.krb5.Config.getInstance()
WARNING: Please consider reporting this to the maintainers of org.apache.hadoop.security.authentication.util.KerberosUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Starting namenodes on [node-master]
node-master: ssh: connect to host node-master port 22: Connection timed out
node1: Error: JAVA_HOME is not set and could not be found.
node2: Error: JAVA_HOME is not set and could not be found.
node3: Error: JAVA_HOME is not set and could not be found.
Starting secondary namenodes [0.0.0.0]
hadoop@0.0.0.0's password: 
0.0.0.0: Error: JAVA_HOME is not set and could not be found.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.hadoop.security.authentication.util.KerberosUtil (file:/home/hadoop/hadoop/share/hadoop/common/lib/hadoop-auth-2.8.4.jar) to method sun.security.krb5.Config.getInstance()
WARNING: Please consider reporting this to the maintainers of org.apache.hadoop.security.authentication.util.KerberosUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

[3种可能性]尽管我不太确定这是造成混乱的原因，但使用openJDK 11似乎存在问题。错误提示ssh有问题，但我)我上传了我的conf文件，没有任何问题，而且我)我可以从主节点访问所有节点。这可能与设置JAVA_HOME路径的方式有关吗？这是我的.bashrc的结尾:

export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
export PATH=PATH:$PATH/bin

在此先感谢您的每条线索(我使用的Java很少，在这里我感到有些失落)

[edit]与OracleJDK8相同

hadoop@master-node:~$  readlink -f /usr/bin/java
/usr/lib/jvm/java-8-oracle/jre/bin/java
hadoop@master-node:~$ export JAVA_HOME=/usr/lib/jvm/java-8-oracle/jre
hadoop@master-node:~$ start-dfs.sh
Starting namenodes on [node-master]
node-master: ssh: connect to host node-master port 22: Connection timed out
node1: Error: JAVA_HOME is not set and could not be found.
node3: Error: JAVA_HOME is not set and could not be found.
node2: Error: JAVA_HOME is not set and could not be found.
Starting secondary namenodes [0.0.0.0]
hadoop@0.0.0.0's password: 

0.0.0.0:错误:未设置JAVA_HOME且找不到。

Answer 1

您可以导出路径吗，

export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
export PATH=$PATH:$JAVA_HOME/bin

然后，您必须执行以下命令，以确保您的PATH包含JAVA_HOME变量。
在.bashrc文件中附加JAVA和PATH变量后，执行以下命令，

source ~/.bashrc

然后检查 echo $PATH，
如果该值包含JAVA_HOME值，则它应该起作用。