data type is object when metric instrument using Gauge?

[mike <ma...@gmail.com>]

Dear All

   We are trying to monitor Cassandra using JMX. The monitoring tool we 
are using works fine for meters, However, if the metrcis are collected 
using gauge, the data type is object, then, our tool treat it as a 
string instead of a double. for example

org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Capacity

The Type of Attribute (Value) is java.lang.Object

is it possible to implement the datatype of gauge as numeric types 
instead of object, or other way around for example using metric 
reporter...etc?

Thanks a lot for any suggestion!

Best Regard!
       Mike

Re: data type is object when metric instrument using Gauge?

[Ken Hancock <ke...@schange.com>]

If you look at VisualVM metadata, it'll show that what's return is
java.lang.Object which is different than Meters or Counters.

Looking at the source for metrics-core, it seems that this is a "feature"
of Gauges because unlike Meters or Counters, Gauges can be of various types
-- long, double, etc.  Cassandra source sets them up as longs, however the
JMXReporter class in metrics-core always exposes them as Objects.




On Mon, Aug 4, 2014 at 7:32 PM, Patricia Gorla <pa...@thelastpickle.com>
wrote:

> Mike,
>
> What metrics reporter are you using? How are you attempting to access the
> metric?
>
>
>
> On Sat, Aug 2, 2014 at 7:30 AM, mike <ma...@gmail.com> wrote:
>
>> Dear All
>>
>>   We are trying to monitor Cassandra using JMX. The monitoring tool we
>> are using works fine for meters, However, if the metrcis are collected
>> using gauge, the data type is object, then, our tool treat it as a string
>> instead of a double. for example
>>
>> org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Capacity
>>
>> The Type of Attribute (Value) is java.lang.Object
>>
>> is it possible to implement the datatype of gauge as numeric types
>> instead of object, or other way around for example using metric
>> reporter...etc?
>>
>> Thanks a lot for any suggestion!
>>
>> Best Regard!
>>       Mike
>>
>>
>>
>>
>
>
> --
> Patricia Gorla
> @patriciagorla
>
> Consultant
> Apache Cassandra Consulting
> http://www.thelastpickle.com <http://thelastpickle.com>
>



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Re: data type is object when metric instrument using Gauge?

[Patricia Gorla <pa...@thelastpickle.com>]

Mike,

What metrics reporter are you using? How are you attempting to access the
metric?



On Sat, Aug 2, 2014 at 7:30 AM, mike <ma...@gmail.com> wrote:

> Dear All
>
>   We are trying to monitor Cassandra using JMX. The monitoring tool we are
> using works fine for meters, However, if the metrcis are collected using
> gauge, the data type is object, then, our tool treat it as a string instead
> of a double. for example
>
> org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Capacity
>
> The Type of Attribute (Value) is java.lang.Object
>
> is it possible to implement the datatype of gauge as numeric types instead
> of object, or other way around for example using metric reporter...etc?
>
> Thanks a lot for any suggestion!
>
> Best Regard!
>       Mike
>
>
>
>


-- 
Patricia Gorla
@patriciagorla

Consultant
Apache Cassandra Consulting
http://www.thelastpickle.com <http://thelastpickle.com>