There's also another bug I just found in my code. But I'll try that as
well (and post when I have an updated diff)
On Mon, Mar 23, 2015 at 9:24 PM, Chinmay Soman <chinmay.cere...@gmail.com>
wrote:
> Since you're producing String data to 'myTopic', can you try setting the
> string serialization in your config ?
>
>
> serializers.registry.string.class=org.apache.samza.serializers.StringSerdeFactory
>
> systems.kafka.streams.myTopic.samza.msg.serde=string
>
>
> On Mon, Mar 23, 2015 at 9:17 PM, Ash W Matheson <ash.mathe...@gmail.com>
> wrote:
>
> > more info - new exception message:
> >
> > Exception in thread "main"
> > org.apache.samza.system.SystemConsumersException: Cannot deserialize an
> > incoming message.
> >
> > Updated the diff in pastebin with the changes.
> >
> > On Mon, Mar 23, 2015 at 8:41 PM, Ash W Matheson <ash.mathe...@gmail.com>
> > wrote:
> >
> > > Gah! Yeah, those were gone several revisions ago but didn't get nuked
> in
> > > the last iteration.
> > >
> > > OK, let me do a quick test to see if that was my problem all along.
> > >
> > > On Mon, Mar 23, 2015 at 8:38 PM, Navina Ramesh <
> > > nram...@linkedin.com.invalid> wrote:
> > >
> > >> Hey Ash,
> > >> I was referring to the lines before the try block.
> > >>
> > >> Map<String, Object> jsonObject = (Map<String, Object>)
> > >> envelope.getMessage();
> > >> WikipediaFeedEvent event = new WikipediaFeedEvent(jsonObject);
> > >>
> > >> try {
> > >> System.out.println("[DWH] should see this");
> > >> System.out.println(event.getRawEvent());
> > >> …
> > >>
> > >>
> > >> Did you remove those lines as well?
> > >>
> > >> Navina
> > >>
> > >> On 3/23/15, 8:31 PM, "Ash W Matheson" <ash.mathe...@gmail.com> wrote:
> > >>
> > >> >Just looking at the diff I posted and it's:
> > >> >
> > >> >
> > >> > 1. try {
> > >> > 2. - Map<String, Object> parsedJsonObject =
> > >> >parse(event.getRawEvent(
> > >> > ));
> > >> > 3. + System.out.println("[DWH] should see this");
> > >> > 4. + System.out.println(event.getRawEvent());
> > >> > 5. + // Map<String, Object> parsedJsonObject = parse(
> > >> > event.getRawEvent());
> > >> >
> > >> >
> > >> >I've removed the Map and added two System.out.println calls. So no,
> > >> there
> > >> >shouldn't be any reference to
> > >> >Map<String, Object> parsedJsonObject = parse(event.getRawEvent());
> > >> >in the source java file.
> > >> >
> > >> >
> > >> >On Mon, Mar 23, 2015 at 7:42 PM, Ash W Matheson <
> > ash.mathe...@gmail.com>
> > >> >wrote:
> > >> >
> > >> >> I'm in transit right now but if memory serves me everything should
> be
> > >> >> commented out of that method except for the System.out.println
> call.
> > >> >>I'll
> > >> >> be home shortly and can confirm.
> > >> >> On Mar 23, 2015 7:28 PM, "Navina Ramesh"
> > <nram...@linkedin.com.invalid
> > >> >
> > >> >> wrote:
> > >> >>
> > >> >>> Hi Ash,
> > >> >>> I just ran wikipedia-parser with your patch. Looks like you have
> set
> > >> >>>the
> > >> >>> message serde correctly in the configs. However, the original code
> > >> >>>still
> > >> >>> converts it into a Map for consumption in the WikipediaFeedEvent.
> > >> >>> I am seeing the following (expected):
> > >> >>>
> > >> >>> 2015-03-23 19:17:49 SamzaContainerExceptionHandler [ERROR]
> Uncaught
> > >> >>> exception in thread (name=main). Exiting process now.
> > >> >>> java.lang.ClassCastException: java.lang.String cannot be cast to
> > >> >>> java.util.Map
> > >> >>> at
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>samza.examples.wikipedia.task.WikipediaParserStreamTask.process(Wikipedi
> > >> >>>aPa
> > >> >>> rserStreamTask.java:38)
> > >> >>> at
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>org.apache.samza.container.TaskInstance$$anonfun$process$1.apply$mcV$sp(
> > >> >>>Tas
> > >> >>> kInstance.scala:133)
> > >> >>>
> > >> >>> Did you make the changes to fix this error? Your patch doesn¹t
> seem
> > to
> > >> >>> have that.
> > >> >>> Line 38 Map<String, Object> jsonObject = (Map<String, Object>)
> > >> >>> envelope.getMessage();
> > >> >>>
> > >> >>>
> > >> >>>
> > >> >>> Lmk so I can investigate further.
> > >> >>>
> > >> >>> Cheers!
> > >> >>> Navina
> > >> >>>
> > >> >>> On 3/23/15, 6:43 PM, "Ash W Matheson" <ash.mathe...@gmail.com>
> > wrote:
> > >> >>>
> > >> >>> >If anyone's interested, I've posted a diff of the project here:
> > >> >>> >http://pastebin.com/6ZW6Y1Vu
> > >> >>> >and the python publisher here: http://pastebin.com/2NvTFDFx
> > >> >>> >
> > >> >>> >if you want to take a stab at it.
> > >> >>> >
> > >> >>> >On Mon, Mar 23, 2015 at 6:04 PM, Ash W Matheson
> > >> >>><ash.mathe...@gmail.com>
> > >> >>> >wrote:
> > >> >>> >
> > >> >>> >> Ok, so very simple test, all running on a local machine, not
> > across
> > >> >>> >> networks and all in the hello-samza repo this time around.
> > >> >>> >>
> > >> >>> >> I've got the datapusher.py file set up to push data into
> > localhost.
> > >> >>>One
> > >> >>> >> event per second.
> > >> >>> >> And a modified hello-samza where I've modified the
> > >> >>> >> WikipediaParserStreamTask.java class to simply read what's
> there.
> > >> >>> >>
> > >> >>> >> Running them both now and I'm seeing in the stderr files
> > >> >>> >>
> > (deploy/yarn/logs/userlogs/application_XXXXX/container_YYYY/stderr)
> > >> >>>the
> > >> >>> >> following:
> > >> >>> >>
> > >> >>> >> Exception in thread "main"
> > >> >>> >> org.apache.samza.system.SystemConsumersException: Cannot
> > >> >>>deserialize an
> > >> >>> >> incoming message.
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.system.SystemConsumers.update(SystemConsumers.scala:2
> > >> >>>>>93)
> > >> >>> >> at org.apache.samza.system.SystemConsumers.org
> > >> >>> >>
> > >>
> >>>$apache$samza$system$SystemConsumers$$poll(SystemConsumers.scala:260)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.system.SystemConsumers$$anonfun$refresh$2.apply(Syste
> > >> >>>>>mCo
> > >> >>> >>nsumers.scala:276)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.system.SystemConsumers$$anonfun$refresh$2.apply(Syste
> > >> >>>>>mCo
> > >> >>> >>nsumers.scala:276)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.
> > >> >>>>>sca
> > >> >>> >>la:244)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.
> > >> >>>>>sca
> > >> >>> >>la:244)
> > >> >>> >> at
> > scala.collection.Iterator$class.foreach(Iterator.scala:727)
> > >> >>> >> at
> > >> >>>scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
> > >> >>> >> at
> > >> >>> scala.collection.MapLike$DefaultKeySet.foreach(MapLike.scala:174)
> > >> >>> >> at
> > >> >>> >>
> > >>
> >>>scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>scala.collection.AbstractSet.scala$collection$SetLike$$super$map(Set.s
> > >> >>>>>cal
> > >> >>> >>a:47)
> > >> >>> >> at scala.collection.SetLike$class.map(SetLike.scala:93)
> > >> >>> >> at scala.collection.AbstractSet.map(Set.scala:47)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.system.SystemConsumers.refresh(SystemConsumers.scala:
> > >> >>>>>276
> > >> >>> >>)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.system.SystemConsumers.choose(SystemConsumers.scala:2
> > >> >>>>>13)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.container.RunLoop$$anonfun$process$2$$anonfun$2.apply
> > >> >>>>>(Ru
> > >> >>> >>nLoop.scala:81)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.container.RunLoop$$anonfun$process$2$$anonfun$2.apply
> > >> >>>>>(Ru
> > >> >>> >>nLoop.scala:81)
> > >> >>> >> at
> > >> >>> >>
> > >>
> >
> >>>org.apache.samza.util.TimerUtils$class.updateTimer(TimerUtils.scala:37)
> > >> >>> >> at
> > >> >>>org.apache.samza.container.RunLoop.updateTimer(RunLoop.scala:36)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.container.RunLoop$$anonfun$process$2.apply(RunLoop.sc
> > >> >>>>>ala
> > >> >>> >>:80)
> > >> >>> >> at
> > >> >>> >>
> > >>
> >
> >>>org.apache.samza.util.TimerUtils$class.updateTimer(TimerUtils.scala:37)
> > >> >>> >> at
> > >> >>>org.apache.samza.container.RunLoop.updateTimer(RunLoop.scala:36)
> > >> >>> >> at
> > org.apache.samza.container.RunLoop.process(RunLoop.scala:79)
> > >> >>> >> at org.apache.samza.container.RunLoop.run(RunLoop.scala:65)
> > >> >>> >> at
> > >> >>> >>
> > >>
> >
> >>>org.apache.samza.container.SamzaContainer.run(SamzaContainer.scala:556)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.container.SamzaContainer$.safeMain(SamzaContainer.sca
> > >> >>>>>la:
> > >> >>> >>108)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >>
> > >>
> >
> >>>org.apache.samza.container.SamzaContainer$.main(SamzaContainer.scala:87)
> > >> >>> >> at
> > >> >>>
> > >>org.apache.samza.container.SamzaContainer.main(SamzaContainer.scala)
> > >> >>> >> Caused by: org.codehaus.jackson.JsonParseException: Unexpected
> > >> >>> character
> > >> >>> >> ('M' (code 77)): expected a valid value (number, String, array,
> > >> >>>object,
> > >> >>> >> 'true', 'false' or 'null')
> > >> >>> >> at [Source: [B@5454d285; line: 1, column: 2]
> > >> >>> >> at
> > >> >>> >>
> > >>
> >>>org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1291)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParse
> > >> >>>>>rMi
> > >> >>> >>nimalBase.java:385)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.codehaus.jackson.impl.JsonParserMinimalBase._reportUnexpectedChar(
> > >> >>>>>Jso
> > >> >>> >>nParserMinimalBase.java:306)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.codehaus.jackson.impl.Utf8StreamParser._handleUnexpectedValue(Utf8
> > >> >>>>>Str
> > >> >>> >>eamParser.java:1581)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.codehaus.jackson.impl.Utf8StreamParser._nextTokenNotInObject(Utf8S
> > >> >>>>>tre
> > >> >>> >>amParser.java:436)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.codehaus.jackson.impl.Utf8StreamParser.nextToken(Utf8StreamParser.
> > >> >>>>>jav
> > >> >>> >>a:322)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.jav
> > >> >>>>>a:2
> > >> >>> >>432)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.ja
> > >> >>>>>va:
> > >> >>> >>2389)
> > >> >>> >> at
> > >> >>> >>
> > >>
> >
> >>>org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1667)
> > >> >>> >> at
> > >> >>>
> > >>org.apache.samza.serializers.JsonSerde.fromBytes(JsonSerde.scala:33)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.serializers.SerdeManager.fromBytes(SerdeManager.scala
> > >> >>>>>:11
> > >> >>> >>5)
> > >> >>> >> at
> > >> >>> >>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>org.apache.samza.system.SystemConsumers.update(SystemConsumers.scala:2
> > >> >>>>>90)
> > >> >>> >>
> > >> >>> >>
> > >> >>> >> I changed the systems.kafka.samza.msg.serde=json to 'string' a
> > >> while
> > >> >>> >>back,
> > >> >>> >> but that caused a separate exception. However that was many,
> > MANY
> > >> >>> >>attempts
> > >> >>> >> ago.
> > >> >>> >>
> > >> >>> >> On Mon, Mar 23, 2015 at 5:23 PM, Ash W Matheson <
> > >> >>> ash.mathe...@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.Met
> > >> >>>>>>ric
> > >> >>> >>>sSnapshotReporterFactory
> > >> >>> >>> metrics.reporter.snapshot.stream=kafka.metrics
> > >> >>> >>>
> > >> >>> >>>
> > >> >>>
> > >> >>>
> > >>
> > >>
> >
> >>>>>>metrics.reporter.jmx.class=org.apache.samza.metrics.reporter.JmxRepor
> > >> >>>>>>ter
> > >> >>> >>>Factory
> > >> >>> >>>
> > >> >>> >>> So, where would I see those metrics?
> > >> >>> >>>
> > >> >>> >>> On Mon, Mar 23, 2015 at 5:15 PM, Ash W Matheson
> > >> >>> >>><ash.mathe...@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.mathe...@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.cere...@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.mathe...@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.mathe...@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 <
> > >> >>> >>>>>> > > nsomasunda...@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 it¹s 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.mathe...@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
>
