[Hawkular-dev] problem with jmx exporter reading an attribute we need for availability

[Lucas Ponce]

Ok, got it.

It's filtered inside wildfly-core.

https://github.com/wildfly/wildfly-core/blob/3.0.8.Final/jmx/src/main/java/org/jboss/as/jmx/model/ModelControllerMBeanHelper.java#L145

So, basically, you can query any MBean but the "java.as:
management-root=server".

I will continue if we can workaround it in a way that doesn't mean to query
all.

(Perhaps to add a corner case in our custom agent).

On Thu, Dec 14, 2017 at 3:04 PM, Lucas Ponce <lponce at redhat.com> wrote:

> I will investigate more on this.
>
> On Wed, Dec 13, 2017 at 10:49 PM, John Mazzitelli <mazz at redhat.com> wrote:
>
>> a temporary workaround: in the whitelist of the jmx exporter file, change:
>>
>> "jboss.as:management-root=server",
>>
>> to:
>>
>> "jboss.as:*",
>>
>> Once i do that, I see the jmx exporter emitting the server avail metric.
>> of course, that sucks because it now tells jmx exporter to get every
>> jboss.as MBean and that causes performance issues.
>>
>> ----- Original Message -----
>> > Ok, well, i hate to leave it like this but - this is so friggin' odd
>> that I
>> > can only say "it is not my fault" :)
>> >
>> > First - note someone changed jmx exporter code because they saw the same
>> > thing as we are - that's what this comment is about:
>> >
>> > https://github.com/prometheus/jmx_exporter/blob/master/colle
>> ctor/src/main/java/io/prometheus/jmx/JmxScraper.java#L110
>> >
>> > See: https://github.com/prometheus/jmx_exporter/issues/89
>> >
>> > But the fix is not 100%.
>> >
>> > If you grab these three files - you can see it yourself:
>> > https://github.com/jmazzitelli/test/tree/master/javaagent
>> > (get Makefile and the two .java files and then run "make
>> download-wildfly
>> > unzip-wildfly compile run")
>> >
>> > You see i use the same API as the jmx exporter here:
>> > https://github.com/jmazzitelli/test/blob/master/javaagent/
>> TestJavaAgent.java#L67
>> >
>> > and that is what you will see:
>> >
>> > 16:31:05,290 INFO  [stdout] (Test Java Agent Thread)
>> > =============================================================
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) FIND INFORMATION
>> ABOUT
>> > MBEAN: jboss.as:management-root=server
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread)
>> > =============================================================
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) isRegistered:
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) true
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) getMBeanInfo:
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread)   description: The
>> root
>> > node of the server-level management model.
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread)   #attributes: 19
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) getAttribute:
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread)
>> > serverState=reload-required
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) queryNames:
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) []
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) queryMBeans:
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) []
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) queryNames(null,
>> null):
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread) FOUND IT:
>> > jboss.as:management-root=server
>> > 16:31:05,291 INFO  [stdout] (Test Java Agent Thread)
>> > =============================================================
>> >
>> >
>> > You will see SOME JMX APIs can see the MBean, queryMBeans and queryNames
>> > canNOT (note the empty arrays []).
>> >
>> > But notice getMBeanInfo CAN see it - I can even get the attribute value
>> from
>> > that! (you can see it is in reload-required state)
>> >
>> > But again, queryMBeans returns nothing.
>> >
>> > Oddly, queryNames(null, null) DOES return it in the list (see the
>> "FOUND IT"
>> > line). It is only if I specifically ask for it does it fail in the query
>> > API.
>> >
>> > The end result - JMX Exporter (at least sometimes) is not able to get
>> "Server
>> > Availability" because it can't get this MBean.
>> >
>> > For some odd reason it can get it sometimes - but it seems when it
>> can't, it
>> > will never get it.
>> >
>> _______________________________________________
>> hawkular-dev mailing list
>> hawkular-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/hawkular-dev
>>
>
>
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