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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: Connections info
Date Fri, 05 Oct 2018 13:24:17 GMT
Hello Abdul,

I was caught by a different topic while answering, sending the message
over, even though it's similar to Romain's solution.

There is the metric mentioned above, or to have more details such as the
app node IP, you can use:

$ sudo netstat -tupawn | grep 9042 | grep ESTABLISHED

tcp        0      0 ::ffff:<C*node_ip>:*9042*   :::*
LISTEN      -

tcp        0      0 ::ffff:<C*node_ip>:*9042*
::ffff:<app_node_ip>:51486  ESTABLISHED
-

tcp        0      0 ::ffff:<C*node_ip>:*9042*
::ffff:<app_node_ip>:37624  ESTABLISHED
-
[...]

tcp        0      0 ::ffff:<C*node_ip>:*9042*
::ffff:<app_node_ip>:49108  ESTABLISHED
-

or to count them:

$ sudo netstat -tupawn | grep 9042 | grep ESTABLISHED | wc -l

113

I'm not sure about the '-tupawn' options, it gives me the format I need and
I never wondered much about it I must say. Maybe some of the options are
useless.

Sending this command through ssh would allow you to gather the information
in one place. You can also run similar commands on the clients (Apps) toI
hope that helps.

C*heers
-----------------------
Alain Rodriguez - @arodream - alain@thelastpickle.com
France / Spain

The Last Pickle - Apache Cassandra Consulting
http://www.thelastpickle.com

Le ven. 5 oct. 2018 à 06:28, Max C. <mc_cassandra@core43.com> a écrit :

> Looks like the number of connections is available in JMX as:
>
> org.apache.cassandra.metrics:type=Client,name=connectedNativeClients
>
> http://cassandra.apache.org/doc/4.0/operating/metrics.html
>
> "Number of clients connected to this nodes native protocol server”
>
> As for where they’re coming from — I’m not sure how to get that from JMX.
> Maybe you’ll have to use “lsof” or something to get that.
>
> - Max
>
> On Oct 4, 2018, at 8:57 pm, Abdul Patel <abd786.ap@gmail.com> wrote:
>
> Hi All,
>
> Can we get number of users connected to each node in cassandra?
> Also can we get from whixh app node they are connecting from?
>
>
>

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