Linux 如何检查 Hadoop 守护进程是否正在运行？
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How to check if Hadoop daemons are running?
提问by Bohdan
What are simple commands to check if Hadoop daemons are running?
检查 Hadoop 守护进程是否正在运行的简单命令是什么？
For example if I'm trying to figure out why HDFS is not setup correctly I'll want to know a way to check if namemonode/datanode/jobtracker/tasktracker are running on this machine.
例如，如果我想弄清楚为什么 HDFS 没有正确设置，我会想知道一种方法来检查 namemonode/datanode/jobtracker/tasktracker 是否正在这台机器上运行。
Is there any way to check it fast without looking into logs or using ps(on Linux)?
有没有办法在不查看日志或使用 ps（在 Linux 上）的情况下快速检查它？
采纳答案by Bohdan
I did not find great solution to it, so I used
我没有找到很好的解决方案，所以我使用了
ps -ef | grep hadoop | grep -P 'namenode|datanode|tasktracker|jobtracker'
just to see if stuff is running
只是为了看看东西是否正在运行
and
和
./hadoop dfsadmin -report
but last was not helpful until server was running.
但最后在服务器运行之前没有帮助。
回答by Mark Vickery
In the shell type 'jps' (you might need a jdk to run jps). It lists all the running java processes and will list out the hadoop daemons that are running.
在 shell 中输入“jps”（你可能需要一个 jdk 来运行 jps）。它列出了所有正在运行的 java 进程，并将列出正在运行的 hadoop 守护进程。
回答by Tariq
apart from jps, another good idea is to use the web interfaces for NameNode and JobTracker provided by Hadoop. It not only shows you the processes but provides you a lot of other useful info like your cluster summary, ongoing jobs etc atc. to go to the NN UI point your web browser to "YOUR_NAMENODE_HOST:9000" and for JT UI "YOUR_JOBTRACKER_HOST:9001".
除了 jps，另一个好主意是使用 Hadoop 提供的 NameNode 和 JobTracker 的 Web 界面。它不仅会向您展示进程，还会为您提供许多其他有用的信息，例如集群摘要、正在进行的作业等。要转到 NN UI，请将您的 Web 浏览器指向“YOUR_NAMENODE_HOST:9000”和 JT UI“YOUR_JOBTRACKER_HOST:9001”。
回答by Pranay Goyal
If you see hadoop process is not running on ps -ef|grep hadoop, run sbin/start-dfs.sh. Monitor with hdfs dfsadmin -report:
如果您看到 hadoop 进程没有运行ps -ef|grep hadoop，请运行sbin/start-dfs.sh。监控hdfs dfsadmin -report：
[mapr@node1 bin]$ hadoop dfsadmin -report
Configured Capacity: 105689374720 (98.43 GB)
Present Capacity: 96537456640 (89.91 GB)
DFS Remaining: 96448180224 (89.82 GB)
DFS Used: 89276416 (85.14 MB)
DFS Used%: 0.09%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0
-------------------------------------------------
Datanodes available: 2 (2 total, 0 dead)
Name: 192.168.1.16:50010
Decommission Status : Normal
Configured Capacity: 52844687360 (49.22 GB)
DFS Used: 44638208 (42.57 MB)
Non DFS Used: 4986138624 (4.64 GB)
DFS Remaining: 47813910528(44.53 GB)
DFS Used%: 0.08%
DFS Remaining%: 90.48%
Last contact: Tue Aug 20 13:23:32 EDT 2013
Name: 192.168.1.17:50010
Decommission Status : Normal
Configured Capacity: 52844687360 (49.22 GB)
DFS Used: 44638208 (42.57 MB)
Non DFS Used: 4165779456 (3.88 GB)
DFS Remaining: 48634269696(45.29 GB)
DFS Used%: 0.08%
DFS Remaining%: 92.03%
Last contact: Tue Aug 20 13:23:34 EDT 2013
回答by CuriousMind
Try jpscommand. It specifies the java processes which are up and running.
试试jps命令。它指定了正在运行的 java 进程。
回答by Flowra
you can use Jps command as vipin said like this command :
您可以像 vipin 所说的那样使用 Jps 命令，如下命令：
/usr/lib/java/jdk1.8.0_25/bin/jps
of course you will change the path of java with the one you have "the path you installed java in"
Jpsis A nifty tool for checking whether the expected Hadoop processes are running (part of Sun's Java since v1.5.0).
the result will be something like that :
当然，您将使用“您安装 java 的路径”更改 java 的路径。
Jps是一个用于检查预期 Hadoop 进程是否正在运行的漂亮工具（自 v1.5.0 以来是 Sun 的 Java 的一部分）。
结果将是这样的：
2287 TaskTracker
2149 JobTracker
1938 DataNode
2085 SecondaryNameNode
2349 Jps
1788 NameNode
I get the answer from this tutorial: http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/
我从本教程中得到答案：http: //www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/
回答by Prashant Chutke
Try running this:
尝试运行这个：
for service in /etc/init.d/hadoop-hdfs-*; do $service status; done;
回答by Santosh Singh
To check whether Hadoop Nodes are running or not:
要检查 Hadoop 节点是否正在运行：
sudo -u hdfs hdfs dfsadmin -report
Configured Capacity: 28799380685 (26.82 GB)
Present Capacity: 25104842752 (23.38 GB)
DFS Remaining: 25012056064 (23.29 GB)
DFS Used: 92786688 (88.49 MB)
DFS Used%: 0.37%
Under replicated blocks: 436
Blocks with corrupt replicas: 0
Missing blocks: 0Datanodes available: 1 (1 total, 0 dead)
Live datanodes:
Name: 127.0.0.1:50010 (localhost.localdomain)
Hostname: localhost.localdomain
Rack: /default
Decommission Status : Normal
Configured Capacity: 28799380685 (26.82 GB)
DFS Used: 92786688 (88.49 MB)
Non DFS Used: 3694537933 (3.44 GB)
DFS Remaining: 25012056064 (23.29 GB)
DFS Used%: 0.32%
DFS Remaining%: 86.85%
Last contact: Thu Mar 01 22:01:38 IST 2018
配置容量：28799380685 (26.82 GB)
当前容量：25104842752 (23.38 GB)
DFS 剩余：25012056064 (23.29 GB) 已用
DFS：92786688（88.49 MB03ds 已使用的 88.49 MB03 ds 复制块 丢失
% 已 损坏的块数）块：0可用数据节点：1（共 1 个，0 个死亡）
实时数据节点：
名称：127.0.0.1 :50010 (localhost.localdomain)
主机名：localhost.localdomain
机架：/default
退役状态：正常
配置容量：28799380685 (26.82 GB)
DFS 使用：92786688 (88.49 MB)
非 DFS (88.49 MB)非 DFS 3.44 GB)
DFS 剩余：25012056064 (23.29 GB)
DFS 已用%：0.32%
DFS 剩余%：86.85%
最后一次联系：2018 年 IST 2018 年 1 月 1 日星期四 22:01:38
回答by Sahil Agnihotri
To check deamons are running?
检查守护进程是否正在运行？
You can check with jps command
您可以使用 jps 命令检查
use use below commands also
也使用下面的命令
ps -ef | grep -w namenode
ps -ef | grep -w datanode
ps -ef | grep -w datanode
ps -ef | grep -w tasktracker
-w :- will help to fetch the exact string
-w :- 将有助于获取确切的字符串
If you have Superuser privilege then you can also use below one for the same:
如果您有超级用户权限，那么您也可以使用以下权限：
./hadoop dfsadmin -report
Hope this will help !!!
希望这会有所帮助！！！
