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From Brooke Jensen <bro...@instaclustr.com>
Subject Re: Expensive to run nodetool status often?
Date Wed, 25 Jan 2017 18:10:33 GMT
Have a look in org.apache.cassandra.net:type=FailureDetector


*Brooke Jensen*
VP Technical Operations & Customer Services
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On 26 January 2017 at 04:20, Xiaolei Li <xiaolei@sumologic.com> wrote:

> Thanks for the advice!
>
> I do export a lot via JMX already. But I couldn't find the equivalent of
> the Status column (Up/Down + Normal/Leaving/Joining/Moving) from the
> status output. Does anyone know if those are available via JMX?
>
> Thank you.
>
> Best,
> x.
>
> On Wed, Jan 25, 2017 at 8:15 AM, Jonathan Haddad <jon@jonhaddad.com>
> wrote:
>
>> You're about to walk down an unfortunate path.  I strongly recommend
>> getting the information you need for monitoring using JMX.  That's actually
>> how nodetool gets all it's information.  Instead of parsing output, if you
>>  use JMX, you'll have access to a *ton* of useful (and some not so useful)
>> information.
>>
>> If you aren't familiar, run Cassandra locally and type "jconsole" in your
>> terminal.  That'll bring up a decent GUI that you can use to browse all the
>> available metrics.
>>
>> You can export metrics a bunch of ways.  Jolokia, mx4j, jmx_exporter (for
>> prometheus), and I know there's a collectd plugin but I haven't used it,
>> might be worth checking out or maybe someone else can weigh in.
>>
>> Jon
>>
>> On Wed, Jan 25, 2017 at 7:48 AM Xiaolei Li <xiaolei@sumologic.com> wrote:
>>
>>> I'm planning to run "nodetool status -r" on every node every minute,
>>> storing the output in a file, and aggregating it somewhere else for
>>> monitoring.
>>>
>>> Is that a good idea?  How expensive is it to be running status every
>>> minute.
>>>
>>> Best,
>>> x.
>>>
>>
>

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