Hadoop：JPS 找不到已安装的 Java
我的配置是
hduser@worker1:/usr/local/hadoop/conf$ jps
The program 'jps' can be found in the following packages:
* openjdk-6-jdk
* openjdk-7-jdk
Ask your administrator to install one of them
我已经安装了java，
hduser@worker1:/usr/local/hadoop/conf$ java -version
java version "1.6.0_23"
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre10-0ubuntu5)
OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)
hduser@worker1:/usr/local/hadoop/conf$ echo $JAVA_HOME
/usr/lib/jvm/java-1.6.0-openjdk
并且也在conf/hadoop-env.sh中进行了设置
hduser@worker1:/usr/local/hadoop/conf$ cat hadoop-env.sh | grep JAVA_HOME
# The only required environment variable is JAVA_HOME. All others are
# set JAVA_HOME in this file, so that it is correctly defined on
export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk
如何使JPS工作？
my configurations are
hduser@worker1:/usr/local/hadoop/conf$ jps
The program 'jps' can be found in the following packages:
* openjdk-6-jdk
* openjdk-7-jdk
Ask your administrator to install one of them
I have java installed though
hduser@worker1:/usr/local/hadoop/conf$ java -version
java version "1.6.0_23"
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre10-0ubuntu5)
OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)
hduser@worker1:/usr/local/hadoop/conf$ echo $JAVA_HOME
/usr/lib/jvm/java-1.6.0-openjdk
and also set up in conf/hadoop-env.sh
hduser@worker1:/usr/local/hadoop/conf$ cat hadoop-env.sh | grep JAVA_HOME
# The only required environment variable is JAVA_HOME. All others are
# set JAVA_HOME in this file, so that it is correctly defined on
export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk
How can I make JPS work?
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评论（12）
Saurabh Saxena 的上述答案不再正确。
要获得jps，您还需要安装开发工具java-1.6.0-openjdk-devel。
在 CentOS 6 上，该文件是：
java-1.6.0-openjdk-devel.x86_64
所以：
就可以了（除了 jdk 和开发工具之外，还可以获取演示和 javadocs，但您将获得命令行工具的完整补充）。
对于 Ubuntu：
对于所有这些示例，您可以尝试 JDK7（只需替换 1.7），并且截至 2012 年 12 月，Hadoop 在没有 Oracle 库的情况下相当稳定。请参阅：http://openjdk.java.net/install/
Saurabh Saxena's answer above is no longer correct.
To get jps, you want to also install the development tools java-1.6.0-openjdk-devel.
On CentOS 6 the file is:
java-1.6.0-openjdk-devel.x86_64
So:
will do the trick (also picks up demo and javadocs besides the jdk and dev tools, but you will get the full complement of command line tools).
For Ubuntu:
For all these examples, you can try JDK7 (just substitute 1.7), and as of December 2012, Hadoop is pretty stable without the Oracle libraries. See: http://openjdk.java.net/install/
这或许也是一个原因。很简单：看看 $javac 是否有效。注意：$java 可能有效，请检查 javac。如果 $javac 不起作用，那么 $jps 也将不起作用。
所以你可能想做类似的事情
并重试。 javac 和 jps 都可以。
祝你好运。
This might also be a reason. Its simple: See if $javac works. Note: $java might work, check javac. If $javac is not working then $jps will not work either.
So you might want to do something like
and try again. both javac and jps.
good luck.
我已经找到了缺少 JPS 命令的解决方案。我在 ubuntu 机器上以伪分布式模式安装 Hadoop 1.x。我使用Java-7-openJDK来提供Java命令和工具。由于某种原因，版本 6 有一个 java-1.6.0-openjdk-devel，但版本 7 没有，特别是 debian 和 ubuntu 发行版。我不确定 Fedora 和 Redhat 是否也是如此。所以当时最好的答案是使用 linux 命令
ps -aux | grep java
我讨厌这样做，因为 Hadoop 守护进程启动时有太多选项，以至于每个结果都填满了一个屏幕。除了看到 java 正在运行之外，不可能看到 hadoop 守护进程正在运行。因此，我想出了一行 shell 脚本形式的简短灵魂
这是我的开放 JDK 的 JPS 脚本
！#/bin/bash
ps -aux | java | grep | awk '{print $12}'
END
我将这两行保存在名为 jps 的文件中，并将其存储在具有执行权限的 hadoop/bin 目录中
**这是脚本的结果
hduser@localhsot# ./jps
-Dproc-namenode
-Dproc-datanode
-Dproc-JobTracker
-Dproc-TaskTracker**
I have found the solution for the missing JPS command. I was installing Hadoop 1.x on ubuntu machine in a pseudo distributed mode. I used Java-7-openJDK to provide for the Java commands and tools. For some reason there was a java-1.6.0-openjdk-devel for version 6 but none for version 7 specifically debian and ubuntu distributions. I am not sure if the same is true for Fedora and Redhat. So the best answer as that time was using the linux command
ps -aux | grep java
I hated doing that because Hadoop daemons start with so many options that each result fills up more than a screen. Apart from seeing that java is running it is impossible to see what hadoop daemons are running. Hence i came up with a short soultion in the form of one line shell script
This is my JPS scirpt for open JDK
!#/bin/bash
ps -aux | grep java | awk '{print $12}'
END
I saved these two lines in a file named jps and stored it in the hadoop/bin directory with execute permissions
**Here is the result of the script
hduser@localhsot# ./jps
-Dproc-namenode
-Dproc-datanode
-Dproc-JobTracker
-Dproc-TaskTracker**
open-jdk里好像没有jps。
对于hadoop来说，安装sun-jvm会是更好的选择。
It seems like open-jdk does not have jps in it.
For hadoop, installing sun-jvm would be a better choice.
试试这个....
try this....
我想为那些面临同样问题的人更新主题。
JDK8 也没有“jps”命令，但 JDK7 有。
I would like to update topic for those who would face the same problem.
JDK8 also does not have the "jps" command but JDK7 does have it.
使用 sudo apt-get install openjdk-7-jdk 而不是 openjdk-7-jre。 。
Use sudo apt-get install openjdk-7-jdk and not openjdk-7-jre. .
对于 ubuntu 中的 java 8，请使用以下命令。
sudo apt install openjdk-8-jdk-headless
For java 8 in ubuntu use the following command.
sudo apt install openjdk-8-jdk-headless
对于 Hadoop，Oracle JDK 6 首选，我我不确定是否有人在没有任何补丁的情况下成功地将 OpenJDK 与 Hadoop 结合使用。仅供参考，有一些关于 也支持 JDK 7。目前，有太多对 Oracle JDK 的依赖。希望依赖性很快消失。
For Hadoop, Oracle JDK 6 preferred, I am not sure if someone has used OpenJDK with Hadoop successfully without any patches. FYI, there had been some talks about support for JDK 7 also. For now, there is too much dependency on Oracle JDK. Hope the dependency goes away soon.
我
当时就找到了
I found it
then
打开 syneptics 包管理器并安装
openjdk-7-jdk和openjdk-6-jdk包。之后 jps 就可以工作了Open syneptics package manager and install
openjdk-7-jdkandopenjdk-6-jdkpackage. AFter that jps will work安装
sudo apt-get install openjdk-8-jdk-headless而不是jreInstall
sudo apt-get install openjdk-8-jdk-headlessnot jre