Andy Li wrote:
I believe this class is the one you are looking for.
org.apache.hadoop.dfs.namenode.metrics.NameNodeStatistics
I just went through the API list from the website 0.16.0 and found this one.
A blunt guess is that if you can invoke these method and get a response,
then you can probably assume the namenode is alive. But you will need to
do some code hacking to figure out how to use it and study it a little bit
to understand
what is going on underneath to confirm. Just a reference.
Not this can work even if NN is dead.
See the next email which explains how to connect to NN and gets it status.
-Andy
On Tue, Mar 25, 2008 at 11:16 PM, Ipraveen <[EMAIL PROTECTED]> wrote:
yes you are right Andy , i want to know is there is any hadoop library api
which can trace name node or datnode
?
Andy Li-3 wrote:
That's relying on Java Virtual Machine process status tool, similar to
'ps
aux|grep java' on a Linux?
I think the question is whether there is any API from Hadoop library
which
can monitor the namenode
through a Java API without relying 3rd party utility tool. Am I right?
-Andy
On Tue, Mar 25, 2008 at 6:26 AM, Zhu Huijun <[EMAIL PROTECTED]>
wrote:
Type the command "jps" in your command window. If your name node is
running,
there will be an output item of "Namenode". Or check the web page at
http://localhost:50070 if you did not change the default server host
and
port of the web.
2008/3/25, Ipraveen <[EMAIL PROTECTED]>:
hi
how would i know whether a name node is runnning or not?
by using hadoop API for java.
regards
praveen jain
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