blocks|key|134774|text|在shell中键入'jps‘(您可能需要jdk才能运行jps)。它列出了所有正在运行的java进程，并列出了正在运行的hadoop守护进程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|134775|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

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.

blocks|key|134810|text|除了jps之外，另一个好主意是使用Hadoop为NameNode和JobTracker提供的web接口。它不仅显示了进程，还为您提供了许多其他有用的信息，如集群摘要、正在进行的作业等atc。要转到NN+UI，请将web浏览器指向"YOUR_NAMENODE_HOST:9000“，对于JT+UI，则指向"YOUR_JOBTRACKER_HOST:9001”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|134811|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

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".

blocks|key|134865|text|我没有找到很好的解决方案，所以我使用了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|134866|ps+-ef+%7C+grep+hadoop+%7C+grep+-P++'namenode%7Cdatanode%7Ctasktracker%7Cjobtracker'|code-block|syntax|javascript|134867|只是想看看是否有东西在运行|134868|和|134869|./hadoop+dfsadmin+-report|134870|但在服务器运行之前，last没有任何帮助。|134871|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I did not find great solution to it, so I used

<pre><code>ps -ef | grep hadoop | grep -P 'namenode|datanode|tasktracker|jobtracker'
</code></pre>

just to see if stuff is running

and 

<pre><code>./hadoop dfsadmin -report
</code></pre>

but last was not helpful until server was running.

blocks|key|352731|text|如果您看到hadoop进程未在ps+-ef%7Cgrep+hadoop上运行，请运行sbin/start-dfs.sh。使用hdfs+dfsadmin+-report进行监控|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|352732|[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%25:+0.09%25
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%25:+0.08%25
DFS+Remaining%25:+90.48%25
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%25:+0.08%25
DFS+Remaining%25:+92.03%25
Last+contact:+Tue+Aug+20+13:23:34+EDT+2013|code-block|syntax|javascript|352733|entityMap^0|F|I|14|H|1O|L|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

If you see hadoop process is not running on <code>ps -ef|grep hadoop</code>, run <code>sbin/start-dfs.sh</code>. Monitor with <code>hdfs dfsadmin -report</code>:

<pre><code>[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
</code></pre>

blocks|key|134929|text|尝试使用jps命令。它指定正在启动和运行的java进程。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|134930|entityMap^0|4|3|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Try <code>jps</code> command. It specifies the java processes which are up and running.

blocks|key|352749|text|尝试运行以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|352750|for+service+in+/etc/init.d/hadoop-hdfs-*;+do+$service+status;+done;|code-block|syntax|javascript|352751|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try running this:

<pre><code>for service in /etc/init.d/hadoop-hdfs-*; do $service status; done;
</code></pre>

blocks|key|352764|text|检查守护进程是否正在运行？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|352765|您可以使用jps命令进行检查|352766|也可以使用下面的命令|352767|ps+-ef+%7C+grep+-w+namenode|code-block|syntax|javascript|352768|ps+-ef+%7C+grep+-w+datanode|offset|length|style|CODE|352769|ps+-ef+%7C+grep+-w+tasktracker+|352770|-w+:-将帮助获取准确的字符串|352771|如果你有超级用户权限，那么你也可以使用下面的权限：|352772|./hadoop+dfsadmin+-report|352773|希望这能有所帮助！|352774|entityMap^0|0|0|0|0|0|P|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|16|8|@$M|17|N|18|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|H|7|19|8|@]|9|@]|A|$I|J]]|$1|S|3|T|5|6|7|1A|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1B|8|@]|9|@]|A|$]]|$1|W|3|X|5|H|7|1C|8|@]|9|@]|A|$I|J]]|$1|Y|3|Z|5|6|7|1D|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|11|$]]

To check deamons are running? 

You can check with jps command

use use below commands also

<pre><code>ps -ef | grep -w namenode
</code></pre>

<code>ps -ef | grep -w datanode</code>

<pre><code>ps -ef | grep -w tasktracker 
</code></pre>

-w :- will help to fetch the exact string

If you have Superuser privilege then you can also use below one for the same:

<pre><code>./hadoop dfsadmin -report
</code></pre>

Hope this will help !!!

What are simple commands to check if Hadoop daemons are running?

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.

Is there any way to check it fast without looking into logs or using ps(on Linux)?

How to check if Hadoop daemons are running?

服务器

Hadoop 

Linux

HDFS

检查Hadoop守护进程是否正在运行的简单命令是什么？例如，如果我试图找出HDFS没有正确设置的原因，我想知道一种方法来检查namemonode/datanode/jobtracker/tasktracker是否在这台机器上运行。有没有什么方法可以在不查看日志或使用ps(在Linux上)的情况下快速检查它？

问如何检查Hadoop守护进程是否正在运行？
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