我在按照本教程设置4集群hadoop体系结构时遇到了一个问题。我有以下4台机器（虚拟化）：
主节点
节点1
节点2
节点3
我在主节点上设置了所有conf文件，并用scp将它们导出到其他文件中。主节点可以通过ssh访问从节点。我在所有机器上都将javau home设置为.bashrc。然而，我得到的是：

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]使用openjdk 11似乎有一个问题，尽管我不太确定这是造成这种混乱的原因。这些错误表明ssh有问题，但是i）我上传了conf文件，没有任何问题，ii）我可以从主节点访问所有节点。这可能与设置javau主路径的方式有关吗？我的文章到此结束。bashrc:

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

提前感谢您的每一条线索（我不太会使用java，我觉得这里有点迷茫）
[编辑]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\ U home并且找不到。