samza-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Chinmay Soman <chinmay.cere...@gmail.com>
Subject Re: New to Samza/Yarn and having Kafka issues
Date Tue, 24 Mar 2015 00:32:12 GMT
You can use Jconsole / Jvisualvm and connect to the JMX port as documented
here:

http://samza.apache.org/learn/documentation/0.8/container/jmx.html



On Mon, Mar 23, 2015 at 5:23 PM, Ash W Matheson <ash.matheson@gmail.com>
wrote:

> Ahh, I was going to add it to the run-class.sh script.
>
> Yeah, it's already there by default:
>
>
> # Metrics
> metrics.reporters=snapshot,jmx
>
> metrics.reporter.snapshot.class=org.apache.samza.metrics.reporter.MetricsSnapshotReporterFactory
> metrics.reporter.snapshot.stream=kafka.metrics
>
> metrics.reporter.jmx.class=org.apache.samza.metrics.reporter.JmxReporterFactory
>
> So, where would I see those metrics?
>
> On Mon, Mar 23, 2015 at 5:15 PM, Ash W Matheson <ash.matheson@gmail.com>
> wrote:
>
> > read: I'm a C++ programmer looking at Java for the first time in > 10
> years
> >
> > On Mon, Mar 23, 2015 at 5:13 PM, Ash W Matheson <ash.matheson@gmail.com>
> > wrote:
> >
> >> I'm assuming I have Jmx defined ... where would that get set?
> >>
> >> On Mon, Mar 23, 2015 at 5:08 PM, Chinmay Soman <
> chinmay.cerebro@gmail.com
> >> > wrote:
> >>
> >>> Hey Ash,
> >>>
> >>> Can you see your job metrics (if you have the Jmx metrics defined) to
> see
> >>> if your job is actually doing anything ? My only guess at this point is
> >>> the
> >>> process method is not being called because somehow there's no incoming
> >>> data. I could be totally wrong of course.
> >>>
> >>> On Mon, Mar 23, 2015 at 4:28 PM, Ash W Matheson <
> ash.matheson@gmail.com>
> >>> wrote:
> >>>
> >>> > Just to be clear, here's what's changed from the default hello-samza
> >>> repo:
> >>> >
> >>> > wikipedia-parser.properties==========================
> >>> > task.inputs=kafka.myTopic
> >>> > systems.kafka.consumer.zookeeper.connect=
> >>> > ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:2181/
> >>> > systems.kafka.consumer.auto.offset.reset=smallest
> >>> >
> >>> > WikipediaParserStreamTask.java =====================
> >>> >   public void process(IncomingMessageEnvelope envelope,
> >>> MessageCollector
> >>> > collector, TaskCoordinator coordinator) {
> >>> >     Map<String, Object> jsonObject = (Map<String, Object>)
> >>> > envelope.getMessage();
> >>> >     WikipediaFeedEvent event = new WikipediaFeedEvent(jsonObject);
> >>> >
> >>> >     try {
> >>> >       System.out.println(event.getRawEvent());
> >>> >       // Map<String, Object> parsedJsonObject =
> >>> parse(event.getRawEvent());
> >>> >
> >>> >       // parsedJsonObject.put("channel", event.getChannel());
> >>> >       // parsedJsonObject.put("source", event.getSource());
> >>> >       // parsedJsonObject.put("time", event.getTime());
> >>> >
> >>> >       // collector.send(new OutgoingMessageEnvelope(new
> >>> > SystemStream("kafka", "wikipedia-edits"), parsedJsonObject));
> >>> >
> >>> > as well as the aforementioned changes to the log4j.xml file.
> >>> >
> >>> > The data pushed into the 'myTopic' topic is nothing more than a
> >>> sentence.
> >>> >
> >>> >
> >>> > On Mon, Mar 23, 2015 at 4:16 PM, Ash W Matheson <
> >>> ash.matheson@gmail.com>
> >>> > wrote:
> >>> >
> >>> > > yep, modified log4j.xml to look like this:
> >>> > >
> >>> > >   <root>
> >>> > >     <priority value="debug" />
> >>> > >     <appender-ref ref="RollingAppender"/>
> >>> > >     <appender-ref ref="jmx" />
> >>> > >   </root>
> >>> > >
> >>> > > Not sure what you mean by #2.
> >>> > >
> >>> > > However, I'm running now, not seeing any exceptions, but still
not
> >>> seeing
> >>> > > any output from System.out.println(...)
> >>> > >
> >>> > > On Mon, Mar 23, 2015 at 11:29 AM, Naveen Somasundaram <
> >>> > > nsomasundaram@linkedin.com.invalid> wrote:
> >>> > >
> >>> > >> Hey Ash,
> >>> > >>                1. Did you happen to modify your log4j.xml
?
> >>> > >>                2. Can you print the class path that was printed
> >>> when the
> >>> > >> job started ? I am wondering if log4j was not loaded or not
> present
> >>> in
> >>> > the
> >>> > >> path where it’s looking for. If you have been using hello
samza,
> it
> >>> > should
> >>> > >> have pulled it from Maven.
> >>> > >>
> >>> > >> Thanks,
> >>> > >> Naveen
> >>> > >>
> >>> > >> On Mar 22, 2015, at 10:35 AM, Ash W Matheson <
> >>> ash.matheson@gmail.com>
> >>> > >> wrote:
> >>> > >>
> >>> > >> > Hey all,
> >>> > >> >
> >>> > >> > Evaluating Samza currently and am running into some odd
issues.
> >>> > >> >
> >>> > >> > I'm currently working off the 'hello-samza' repo and
trying to
> >>> parse a
> >>> > >> > simple kafka topic that I've produced through an extenal
java
> app
> >>> > >> (nothing
> >>> > >> > other than a series of sentences) and it's failing pretty
hard
> >>> for me.
> >>> > >> The
> >>> > >> > base 'hello-samza' set of apps works fine, but as soon
as I
> >>> change the
> >>> > >> > configuration to look at a different Kafka/zookeeper
I get the
> >>> > >> following in
> >>> > >> > the userlogs:
> >>> > >> >
> >>> > >> > 2015-03-22 17:07:09 KafkaSystemAdmin [WARN] Unable to
fetch last
> >>> > offsets
> >>> > >> > for streams [myTopic] due to kafka.common.KafkaException:
> fetching
> >>> > topic
> >>> > >> > metadata for topics [Set(myTopic)] from broker
> >>> > >> > [ArrayBuffer(id:0,host:redacted,port:9092)] failed. Retrying.
> >>> > >> >
> >>> > >> >
> >>> > >> > The modifications are pretty straightforward.  In the
> >>> > >> > Wikipedia-parser.properties, I've changed the following:
> >>> > >> > task.inputs=kafka.myTopic
> >>> > >> > systems.kafka.consumer.zookeeper.connect=redacted:2181/
> >>> > >> > systems.kafka.consumer.auto.offset.reset=smallest
> >>> > >> > systems.kafka.producer.metadata.broker.list=redacted:9092
> >>> > >> >
> >>> > >> > and in the actual java file WikipediaParserStreamTask.java
> >>> > >> >  public void process(IncomingMessageEnvelope envelope,
> >>> > MessageCollector
> >>> > >> > collector, TaskCoordinator coordinator) {
> >>> > >> >    Map<String, Object> jsonObject = (Map<String,
Object>)
> >>> > >> > envelope.getMessage();
> >>> > >> >    WikipediaFeedEvent event = new
> WikipediaFeedEvent(jsonObject);
> >>> > >> >
> >>> > >> >    try {
> >>> > >> >        System.out.println(event.getRawEvent());
> >>> > >> >
> >>> > >> > And then following the compile/extract/run process outlined
in
> the
> >>> > >> > hello-samza website.
> >>> > >> >
> >>> > >> > Any thoughts?  I've looked online for any 'super simple'
> examples
> >>> of
> >>> > >> > ingesting kafka in samza with very little success.
> >>> > >>
> >>> > >>
> >>> > >
> >>> >
> >>>
> >>>
> >>>
> >>> --
> >>> Thanks and regards
> >>>
> >>> Chinmay Soman
> >>>
> >>
> >>
> >
>



-- 
Thanks and regards

Chinmay Soman

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message