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From Guozhang Wang <wangg...@gmail.com>
Subject Re: How to parse some of JMX Bean's names.
Date Wed, 04 Jun 2014 20:20:30 GMT
I think we will make this change in the new consumer, which may be released
in 0.9.

Guozhang


On Wed, Jun 4, 2014 at 12:13 PM, Vladimir Tretyakov <
vladimir.tretyakov@sematext.com> wrote:

> Hi, thx Guozhang Wang, looking forward.
>
> When do you think this changes will available? 0.8.2? Jul 2014
> https://cwiki.apache.org/confluence/display/KAFKA/Future+release+plan ? Or
> later?
>
> Best regards, Vladimir.
>
>
> On Wed, Jun 4, 2014 at 8:01 PM, Guozhang Wang <wangguoz@gmail.com> wrote:
>
> > Hello Vladimir, comments in-lined.
> >
> >
> > On Wed, Jun 4, 2014 at 6:08 AM, Vladimir Tretyakov <
> > vladimir.tretyakov@sematext.com> wrote:
> >
> > > Hi again, few more questions from me:
> > >
> > > *1.*
> > >
> > > What I see in JMX:
> > >
> > >
> > >
> >
> kafka.consumer:type="ZookeeperConsumerConnector",name="af_servers-af_servers-spm_new_cluster_topic-af_servers_wawanawna-Dell-1401353748289-fcaaea29-0-FetchQueueSize"
> > >
> > > From code:
> > >
> > > newGauge(
> > >         config.clientId + "-" + config.groupId + "-" +
> topicThreadId._1 +
> > > "-" + topicThreadId._2 + "-FetchQueueSize",
> > >         new Gauge[Int] {
> > >           def value = q.size
> > >         }
> > >       )
> > >
> > > I've tried to parse part as I've understood they.
> > >
> > > config.clientId       >> af_servers
> > > topicThreadId._1 >> af_servers-spm_new_cluster_topic
> > > topicThreadId._2 >> af_servers_wawanawna-Dell-1401353748289-fcaaea29-0
> > >
> > > Yes I can suppose that this topicThreadId._1 will always looks like
> > > GROUP_ID+TOPIC and topicThreadId._2 will contain CONSUMER HOST, but
> will
> > it
> > > always true?
> >
> >
> >
> > With the new consumer coming soon, the metrics naming schemes would very
> > likely to be refined. So I cannot say this will always be true.
> >
> >
> >
> > >
> > > *2.*
> > >
> > > From code I see that sometimes Kafka uses "_" as separator, not only
> "-":
> > >
> > > val consumerIdString = {
> > >     var consumerUuid : String = null
> > >     config.consumerId match {
> > >       case Some(consumerId) // for testing only
> > >       => consumerUuid = consumerId
> > >       case None // generate unique consumerId automatically
> > >       => val uuid = UUID.randomUUID()
> > >       consumerUuid = "%s-%d-%s".format(
> > >         InetAddress.getLocalHost.getHostName, System.currentTimeMillis,
> > >         uuid.getMostSignificantBits().toHexString.substring(0,8))
> > >     }
> > >     config.groupId + "_" + consumerUuid
> > >   }
> > >
> > > That means if user will use "_" as part of his host/topic/groupId name
> it
> > > maybe be a problem to parse string like:
> > >
> > >
> > >
> >
> kafka.consumer:type="ZookeeperConsumerConnector",name="af_servers-af_servers-spm_new_cluster_topic-af_servers_wawanawna-Dell-1401353748289-fcaaea29-0-FetchQueueSize"
> > >
> > > Look at part: "spm_new_cluster_topic-af_servers_wawanawna-Dell", what
> is
> > > host name here "servers_wawanawna-Dell" or "wawanawna-Dell" ?
> > >
> > > So from one side if we want to be able parse name without any problems
> we
> > > have to avoid using "-" and "_" in host/topic/groupId/clientId, but at
> > the
> > > same time I see (from
> > > http://grokbase.com/t/kafka/users/133xfsnpdh/cant-use-in-client-name):
> > >
> > > *"Client id is used for registering jmx beans for monitoring. Because
> of
> > > the*
> > > *restrictions in bean names, we limit the client id to be only
> > > alpha-numeric*
> > > *plus "-" and "_"."*
> > >
> > > Does that mean user can use only camelCase in his
> > > host/topic/groupId/clientId for distinguish one part of name from
> > another?
> > >
> > > Is this a problem? Or I didn't understand something?
> > >
> >
> > Yeah I agree this is a problem, and we should fix it in the new consumer.
> >
> >
> > >
> > > Best regards from Sematext.
> > >
> > >
> > >
> > >
> > >
> > >
> > > On Tue, Jun 3, 2014 at 3:24 AM, Otis Gospodnetic <
> > > otis.gospodnetic@gmail.com
> > > > wrote:
> > >
> > > > Hi Guozhang,
> > > >
> > > > On Mon, Jun 2, 2014 at 7:18 PM, Guozhang Wang <wangguoz@gmail.com>
> > > wrote:
> > > >
> > > > > That is indeed a problem, for now, we recommend group name and
> topic
> > > > names
> > > > > to use "_" when there is a need for "-", but this should be fixed
> > > > > systematically.
> > > > >
> > > >
> > > > Right!
> > > >
> > > > For you use case, could you change your topic/group name using "_"?
> > > >
> > > >
> > > > Our own Kafka doesn't use topics with "-" characters, so we don't
> have
> > a
> > > > problem.
> > > >
> > > > The problem, in our case, is that we have a general (Kafka)
> monitoring
> > > tool
> > > > that other people use to monitor Kafka - see
> http://sematext.com/spm/
> > .
> > > >  So
> > > > we can't really tell people "hey, our tool will work but only if you
> > > don't
> > > > have a dash in your topic names and hosts and ... because if you use
> > > dashes
> > > > we won't know how to parse your Kafka's MBean names" :)
> > > >
> > > >
> > > > > Also, do you mind to file a JIRA ticket to keep track of this
> issue?
> > > >
> > > >
> > > > Here it is: https://issues.apache.org/jira/browse/KAFKA-1481
> > > >
> > > > Otis
> > > > --
> > > > Performance Monitoring * Log Analytics * Search Analytics
> > > > Solr & Elasticsearch Support * http://sematext.com/
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > >
> > > > > On Mon, Jun 2, 2014 at 5:18 AM, Vladimir Tretyakov <
> > > > > vladimir.tretyakov@sematext.com> wrote:
> > > > >
> > > > > > Hello everyone,
> > > > > >
> > > > > > We are adding Kafka 0.8.x monitoring support to SPM
> > > > > > <http://sematext.com/spm/> here at Sematext. Unfortunately,
we
> > > quickly
> > > > > hit
> > > > > > an issue caused by the new bean naming convention that embeds
> > things
> > > > like
> > > > > > topic and host names in the beans along with metrics, separated
> by
> > > > > dashes,
> > > > > > making it hard to parse these beans.
> > > > > >
> > > > > > To put it simply: it is hard/impossible to automatically figure
> out
> > > > which
> > > > > > part of the bean name is e.g. consumer group, which is the topic,
> > > which
> > > > > is
> > > > > > the host name, and which is the name of the metric.
> > > > > >
> > > > > > Let me show you what I mean:
> > > > > >
> > > > > > kafka.consumer:type="ConsumerTopicMetrics",
> > > > > >
> > > > > >                        name="af_servers-spm_topic-BytesPerSec"
> > > > > >
> > > > > > Here we actually CAN extract:
> > > > > >
> > > > > >  * consumer group ('af_servers')
> > > > > >
> > > > > >  * topic ('spm_topic')
> > > > > >
> > > > > >  * metric (‘BytesPerSec’)
> > > > > >
> > > > > > BUT what if the consumer group id and/or topic name contain
'-'?
> > > > > >
> > > > > > Then how would we extract consumer group and topic?
> > > > > >
> > > > > > Here is a concrete example of this problem:
> > > > > >
> > > > > > kafka.consumer:type="ConsumerTopicMetrics",
> > > > > >
> > > > > >                       name="af-servers-spm-topic-BytesPerSec"
> > > > > >
> > > > > > How can we know what is group id or topic name here?
> > > > > >
> > > > > > This looks like a problem to me, but maybe I’m missing something?
> > > > > >
> > > > > > Is it possible to have all these values (group id, topic name)
as
> > > > > separate
> > > > > > attributes inside JMX bean?
> > > > > >
> > > > > > Or maybe the problem could be solved if a different delimiter
was
> > > used,
> > > > > > such as the pipe (“I”)?
> > > > > >
> > > > > > It is really needed things and will be nice to have it to build
> > good
> > > > tool
> > > > > > for monitoring.
> > > > > >
> > > > > > Thx and best regards from Sematext.
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > -- Guozhang
> > > > >
> > > >
> > >
> >
> >
> >
> > --
> > -- Guozhang
> >
>



-- 
-- Guozhang

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