Also, message.toString() is not the right way to convert the message to
String. You need to take the payload from the message and then convert the
bytes to string. Take a look at
examples/src/main/java/kafka/examples/ExampleUtils.java
Jun
On Fri, May 11, 2012 at 9:30 AM, lessonz <lessonz.leg...@gmail.com> wrote:
> Upon commenting out the logging output (the first and the identical one in
> the finally clause), I'm still not getting anything from the server. I'm
> assuming the sample client code works for others. That's why I'm worried my
> problem might be more environmental, like a missing dependency. Has anyone
> else tested the sample code?
>
> On Fri, May 11, 2012 at 10:13 AM, Jun Rao <jun...@gmail.com> wrote:
>
> > Try not to do logger.severe("stream = " + stream). I am not sure if a
> > stream is printable.
> >
> > Jun
> >
> > On Fri, May 11, 2012 at 8:27 AM, lessonz <lessonz.leg...@gmail.com>
> wrote:
> >
> > > Okay, here's the newly amended code:
> > >
> > > import java.util.Calendar;
> > > import java.util.Collections;
> > > import java.util.List;
> > > import java.util.Map;
> > > import java.util.Properties;
> > > import java.util.logging.Logger;
> > >
> > > import kafka.consumer.Consumer;
> > > import kafka.consumer.ConsumerConfig;
> > > import kafka.consumer.KafkaMessageStream;
> > > import kafka.javaapi.consumer.ConsumerConnector;
> > > import kafka.message.Message;
> > > import kafka.serializer.DefaultDecoder;
> > >
> > > public class KafkaTestConsumer {
> > >
> > > /**
> > > * @param args
> > > */
> > > public static void main(final String[] args) {
> > > final Logger logger = Logger.getLogger("KafkaTestConsumer");
> > > try {
> > >
> > > // specify some consumer properties
> > > final Properties props = new Properties();
> > > props.put("zk.connect", "testServer:2181");
> > > props.put("zk.connectiontimeout.ms", "1000000");
> > > props.put("groupid", "test_group");
> > >
> > > // Create the connection to the cluster
> > > final ConsumerConfig consumerConfig = new
> > ConsumerConfig(props);
> > > final ConsumerConnector consumerConnector =
> > > Consumer.createJavaConsumerConnector(consumerConfig);
> > >
> > > // create 4 partitions of the stream for topic “testTopic”,
> to
> > > allow
> > > // 4
> > > // threads to consume
> > > final String topicName = "testTopic";
> > > final int numStreams = 1;
> > > List<KafkaMessageStream<Message>> streams = null;
> > > try {
> > > final Map<String, List<KafkaMessageStream<Message>>>
> > > topicMessageStreams = consumerConnector
> > >
> > > .createMessageStreams(Collections.singletonMap(topicName, numStreams),
> > new
> > > DefaultDecoder());
> > > streams = topicMessageStreams.get(topicName);
> > > } catch (final Exception e) {
> > > logger.severe(e.getMessage());
> > > }
> > >
> > > final KafkaMessageStream<Message> stream = streams.get(0);
> > >
> > > final Thread thread = new Thread(new Runnable() {
> > > @Override
> > > public void run() {
> > > try {
> > > while (true) {
> > >
> > > logger.severe(Calendar.getInstance().getTime().toString());
> > > if (stream == null) {
> > > logger.severe("stream is NULL.");
> > > } else {
> > > logger.severe("stream = " + stream);
> > > for (final Message message : stream) {
> > > logger.severe("!");
> > > logger.severe(message.toString());
> > > }
> > > }
> > > }
> > > } catch (final Throwable t) {
> > > logger.severe("In run " + t.getMessage());
> > > } finally {
> > > if (stream == null) {
> > > logger.severe("stream is NULL.");
> > > } else {
> > > logger.severe("stream = " + stream);
> > > }
> > > }
> > > }
> > > });
> > >
> > > thread.start();
> > > } catch (final Throwable t) {
> > > logger.severe("In main" + t.getMessage());
> > > }
> > > }
> > > }
> > >
> > > Behavior is identical to using the executor. I get the logged time, but
> > > nothing else. Using debugging stream is not null, but as soon as I try
> to
> > > reference it in the line "logger.severe("stream = " + stream);" it
> dies.
> > I
> > > don't get that output. So, it seems in both cases, my call to
> > > consumerConnector.createMessageStreams(...) is returning a Map of the
> > right
> > > size, but its contents appear to be corrupt.
> > >
> > > I have the source, but I really know nothing about Scala. In looking at
> > > kafka.javaapi.consumer.ZookeeperConsumerConnector#createMessageStreams,
> > it
> > > all seems pretty straightforward. I have to wonder again about whether
> > I'm
> > > somehow throwing a silent class definition not found exception. For
> > > dependencies I only have scala-library 2.8.0 and zkclient 0.1. Is that
> > > really all that's needed? Are they the right versions?
> > >
> > > Again, thanks for your help.
> > >
> > >
> > > On Thu, May 10, 2012 at 6:01 PM, Jun Rao <jun...@gmail.com> wrote:
> > >
> > > > Another thing that I would suggest is to not use Executors and start
> > your
> > > > own thread for consumption.
> > > >
> > > > Jun
> > > >
> > > > On Thu, May 10, 2012 at 12:14 PM, lessonz <lessonz.leg...@gmail.com>
> > > > wrote:
> > > >
> > > > > Yes, get /consumers/test_group/offsets/
> > > > > testTopic/0-0 shows values changing. Neither
> > > /consumers/[group_id]/ids/[
> > > > > consumer_id] nor /consumers/test_group/owners change any values.
> > > > Hopefully
> > > > > that tells us something? Again, thanks for all of your help.
> > > > >
> > > > >
> > > > > On Thu, May 10, 2012 at 10:28 AM, Jun Rao <jun...@gmail.com>
> wrote:
> > > > >
> > > > > > So you are saying that the value in
> > > > > > /consumers/test_group/offsets/testTopic/0-0
> > > > > > is moving? That typically means that the consumer is consuming.
> > What
> > > > > about
> > > > > > the values of /consumers/test_group//ids and
> > > > /consumers/test_group/owner?
> > > > > >
> > > > > > Jun
> > > > > >
> > > > > > On Thu, May 10, 2012 at 8:53 AM, lessonz <
> lessonz.leg...@gmail.com
> > >
> > > > > wrote:
> > > > > >
> > > > > > > Well, that makes more sense. Sorry about that.
> > > > > > >
> > > > > > > Okay, so here are the results (I subbed in the [client machine
> > > name]
> > > > > for
> > > > > > > the actual value):
> > > > > > >
> > > > > > > ls /consumers/test_group/ids
> > > > > > > [test_group_[client machine name]-1336664541413-4179e37b]
> > > > > > > get /consumers/test_group/ids/test_group_[client machine
> > > > > > > name]-1336664541413-4179e37b
> > > > > > > { "testTopic": 1 }
> > > > > > > cZxid = 0xd6
> > > > > > > ctime = Thu May 10 09:39:39 MDT 2012
> > > > > > > mZxid = 0xd6
> > > > > > > mtime = Thu May 10 09:39:39 MDT 2012
> > > > > > > pZxid = 0xd6
> > > > > > > cversion = 0
> > > > > > > dataVersion = 0
> > > > > > > aclVersion = 0
> > > > > > > ephemeralOwner = 0x137376733c00002
> > > > > > > dataLength = 18
> > > > > > > numChildren = 0
> > > > > > >
> > > > > > > and
> > > > > > >
> > > > > > > ls /consumers/test_group/offsets/testTopic
> > > > > > > [0-0]
> > > > > > > get /consumers/test_group/offsets/testTopic/0-0
> > > > > > > -1
> > > > > > > cZxid = 0x1d
> > > > > > > ctime = Wed May 09 13:29:24 MDT 2012
> > > > > > > mZxid = 0x106
> > > > > > > mtime = Thu May 10 09:47:18 MDT 2012
> > > > > > > pZxid = 0x1d
> > > > > > > cversion = 0
> > > > > > > dataVersion = 211
> > > > > > > aclVersion = 0
> > > > > > > ephemeralOwner = 0x0
> > > > > > > dataLength = 2
> > > > > > > numChildren = 0
> > > > > > >
> > > > > > > After sending some messages via the console producer, the only
> > > values
> > > > > > that
> > > > > > > appear to change are (same values omitted):
> > > > > > >
> > > > > > > get /consumers/test_group/offsets/testTopic/0-0
> > > > > > > mZxid = 0x11a
> > > > > > > mtime = Thu May 10 09:50:18 MDT 2012
> > > > > > > dataVersion = 229
> > > > > > >
> > > > > > > I'm not sure if that helps any, but I really appreciate your
> > > > > assistance.
> > > > > > >
> > > > > > > On Wed, May 9, 2012 at 3:08 PM, Jun Rao <jun...@gmail.com>
> > wrote:
> > > > > > >
> > > > > > > > Run bin/zookeeper-shell.sh. This will bring up an interactive
> > ZK
> > > > > shell.
> > > > > > > > Type ? to see the list of commands. You can do things like
> "ls
> > > > > > > > /consumers/[group_id]/ids" and get "
> > > > > > > > /consumers/[group_id]/ids/[consumer_id]". Do this while you
> > > > consumer
> > > > > > code
> > > > > > > > is running.
> > > > > > > >
> > > > > > > > Jun
> > > > > > > >
> > > > > > > > On Wed, May 9, 2012 at 12:53 PM, lessonz <
> > > lessonz.leg...@gmail.com
> > > > >
> > > > > > > wrote:
> > > > > > > >
> > > > > > > > > I must apologize for my ignorance. I'm not sure where I
> > should
> > > be
> > > > > > > looking
> > > > > > > > > for these values. The bin/zookeeper-shell.sh doesn't have
> > them
> > > (I
> > > > > > don't
> > > > > > > > > think it should). When I cleaned the log directory to start
> > > from
> > > > > > > > scratch, I
> > > > > > > > > get /tmp/zookeeper/version-2/log.1 and
> > > /tmp/zookeeper/version-2/.
> > > > > > First
> > > > > > > > > they both appear to be binary, should they be? Since
> they're
> > > > binary
> > > > > > and
> > > > > > > > I'm
> > > > > > > > > using PuTTY, grepping is of limited value (
> > > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> http://www.chiark.greenend.org.uk/~sgtatham/putty/faq.html#faq-puttyputty
> > > > > > > > > ).
> > > > > > > > > The values you mentioned before definitely appear in log.1,
> > but
> > > > > > because
> > > > > > > > of
> > > > > > > > > the binary, I'm not seeing any assignment operators and
> > trying
> > > to
> > > > > > make
> > > > > > > > > heads or tails of it is currently beyond me. Also
> > interesting,
> > > > > pretty
> > > > > > > > much
> > > > > > > > > immediately log.1 caps at 67108864 bytes and stays there.
> > It's
> > > > time
> > > > > > > stamp
> > > > > > > > > is being updated, so it's still getting touched.
> > > > > > > > >
> > > > > > > > > So, I'm probably looking in the wrong place. Where/How can
> I
> > > find
> > > > > > these
> > > > > > > > > values?
> > > > > > > > >
> > > > > > > > > On Wed, May 9, 2012 at 11:09 AM, Jun Rao <jun...@gmail.com
> >
> > > > wrote:
> > > > > > > > >
> > > > > > > > > > I would try the test with numStreams=1 and see what
> > happens.
> > > > > Also,
> > > > > > > you
> > > > > > > > > may
> > > > > > > > > > want to produce some new data after the test starts.
> > > > > > > > > >
> > > > > > > > > > If you still have problem, could you get the value of the
> > > > > following
> > > > > > > > paths
> > > > > > > > > > from ZK (bin/zookeeper-shell.sh) after you started your
> > > > consumer
> > > > > > > test?
> > > > > > > > > >
> > > > > > > > > > /consumers/[group_id]/ids/[consumer_id]
> > > > > > > > > >
> > > > > > > > > >
> > > /consumers/[group_id]/offsets/[topic]/[broker_id-partition_id]
> > > > > > > > > >
> > > > > > > > > > Jun
> > > > > > > > > >
> > > > > > > > > > On Wed, May 9, 2012 at 8:49 AM, lessonz <
> > > > > lessonz.leg...@gmail.com>
> > > > > > > > > wrote:
> > > > > > > > > >
> > > > > > > > > > > Okay, here is the amended code:
> > > > > > > > > > >
> > > > > > > > > > > import java.util.Calendar;
> > > > > > > > > > > import java.util.Collections;
> > > > > > > > > > > import java.util.List;
> > > > > > > > > > > import java.util.Map;
> > > > > > > > > > > import java.util.Properties;
> > > > > > > > > > > import java.util.concurrent.ExecutorService;
> > > > > > > > > > > import java.util.concurrent.Executors;
> > > > > > > > > > > import java.util.logging.Logger;
> > > > > > > > > > >
> > > > > > > > > > > import kafka.consumer.Consumer;
> > > > > > > > > > > import kafka.consumer.ConsumerConfig;
> > > > > > > > > > > import kafka.consumer.KafkaMessageStream;
> > > > > > > > > > > import kafka.javaapi.consumer.ConsumerConnector;
> > > > > > > > > > > import kafka.message.Message;
> > > > > > > > > > > import kafka.serializer.DefaultDecoder;
> > > > > > > > > > >
> > > > > > > > > > > public class KafkaTestConsumer {
> > > > > > > > > > >
> > > > > > > > > > > /**
> > > > > > > > > > > * @param args
> > > > > > > > > > > */
> > > > > > > > > > > public static void main(final String[] args) {
> > > > > > > > > > > try {
> > > > > > > > > > > final Logger logger =
> > > > > > > > > Logger.getLogger("KafkaTestConsumer");
> > > > > > > > > > >
> > > > > > > > > > > // specify some consumer properties
> > > > > > > > > > > final Properties props = new Properties();
> > > > > > > > > > > props.put("zk.connect", "testserver:2181");
> > > > > > > > > > > props.put("zk.connectiontimeout.ms",
> > > "1000000");
> > > > > > > > > > > props.put("groupid", "test_group");
> > > > > > > > > > >
> > > > > > > > > > > // Create the connection to the cluster
> > > > > > > > > > > final ConsumerConfig consumerConfig = new
> > > > > > > > > > ConsumerConfig(props);
> > > > > > > > > > > final ConsumerConnector consumerConnector =
> > > > > > > > > > > Consumer.createJavaConsumerConnector(consumerConfig);
> > > > > > > > > > >
> > > > > > > > > > > // create 4 partitions of the stream for
> topic
> > > > > > > > “testTopic”,
> > > > > > > > > to
> > > > > > > > > > > allow
> > > > > > > > > > > // 4
> > > > > > > > > > > // threads to consume
> > > > > > > > > > > final String topicName = "testTopic";
> > > > > > > > > > > final int numStreams = 4;
> > > > > > > > > > > List<KafkaMessageStream<Message>> streams =
> > > null;
> > > > > > > > > > > try {
> > > > > > > > > > > final Map<String,
> > > > > > List<KafkaMessageStream<Message>>>
> > > > > > > > > > > topicMessageStreams = consumerConnector
> > > > > > > > > > >
> > > > > > > > > > >
> .createMessageStreams(Collections.singletonMap(topicName,
> > > > > > > > numStreams),
> > > > > > > > > > new
> > > > > > > > > > > DefaultDecoder());
> > > > > > > > > > > streams =
> > > topicMessageStreams.get(topicName);
> > > > > > > > > > > } catch (final Exception e) {
> > > > > > > > > > > logger.severe(e.getMessage());
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > > > // create list of 4 threads to consume from
> > each
> > > > of
> > > > > > the
> > > > > > > > > > > partitions
> > > > > > > > > > > final ExecutorService executor =
> > > > > > > > > > > Executors.newFixedThreadPool(numStreams);
> > > > > > > > > > >
> > > > > > > > > > > // consume the messages in the threads
> > > > > > > > > > > for (final KafkaMessageStream<Message>
> stream
> > :
> > > > > > > streams) {
> > > > > > > > > > > executor.submit(new Runnable() {
> > > > > > > > > > > @Override
> > > > > > > > > > > public void run() {
> > > > > > > > > > > try {
> > > > > > > > > > > while (true) {
> > > > > > > > > > >
> > > > > > > > > > >
> > logger.severe(Calendar.getInstance().getTime().toString());
> > > > > > > > > > > if (stream == null) {
> > > > > > > > > > >
> logger.severe("stream
> > is
> > > > > > > NULL.");
> > > > > > > > > > > } else {
> > > > > > > > > > >
> logger.severe("stream
> > =
> > > "
> > > > +
> > > > > > > > stream);
> > > > > > > > > > > for (final Message
> > > > message
> > > > > :
> > > > > > > > > stream)
> > > > > > > > > > {
> > > > > > > > > > >
> > logger.severe("!");
> > > > > > > > > > >
> > > > > > > > > logger.severe(message.toString());
> > > > > > > > > > > }
> > > > > > > > > > > }
> > > > > > > > > > > }
> > > > > > > > > > > } catch (final Throwable t) {
> > > > > > > > > > > logger.severe("In run " +
> > > > > > > t.getMessage());
> > > > > > > > > > > } finally {
> > > > > > > > > > > if (stream == null) {
> > > > > > > > > > > logger.severe("stream is
> > > > > NULL.");
> > > > > > > > > > > } else {
> > > > > > > > > > > logger.severe("stream =
> "
> > +
> > > > > > stream);
> > > > > > > > > > > }
> > > > > > > > > > > }
> > > > > > > > > > > }
> > > > > > > > > > > });
> > > > > > > > > > > }
> > > > > > > > > > > } catch (final Throwable t) {
> > > > > > > > > > > System.err.println("In main" +
> > t.getMessage());
> > > > > > > > > > > }
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > > > Interesting things happen. I get the time printed out
> > only
> > > > once
> > > > > > for
> > > > > > > > > each
> > > > > > > > > > > stream. If I use eclipse's debugging and a breakpoint
> on
> > > the
> > > > > line
> > > > > > > "if
> > > > > > > > > > > (stream == null) {" in the "while (true) {" loop, the
> > > > variable
> > > > > > > stream
> > > > > > > > > > says
> > > > > > > > > > > "<error(s)_during_the_evaluation>" for value. If I step
> > > over
> > > > > this
> > > > > > > > line,
> > > > > > > > > > I'm
> > > > > > > > > > > taken into the else clause, but the logger is never
> > > executed,
> > > > > and
> > > > > > > > seems
> > > > > > > > > > to
> > > > > > > > > > > die when referencing the stream value. So, I got to
> > > thinking
> > > > > > maybe
> > > > > > > > the
> > > > > > > > > > > problem is a missing dependency somewhere or maybe a
> > > > conflict.
> > > > > > So,
> > > > > > > > here
> > > > > > > > > > are
> > > > > > > > > > > the dependencies I have in that project's pom (the
> > project
> > > > has
> > > > > > > other
> > > > > > > > > > > pieces):
> > > > > > > > > > >
> > > > > > > > > > > <dependencies>
> > > > > > > > > > > <!-- Import the JMS API, we use provided scope
> as
> > > the
> > > > > API
> > > > > > is
> > > > > > > > > > > included in
> > > > > > > > > > > JBoss AS 7 -->
> > > > > > > > > > > <dependency>
> > > > > > > > > > > <groupId>org.jboss.spec.javax.jms</groupId>
> > > > > > > > > > >
> > <artifactId>jboss-jms-api_1.1_spec</artifactId>
> > > > > > > > > > > <scope>provided</scope>
> > > > > > > > > > > </dependency>
> > > > > > > > > > > <!-- Import the JCA API, we use provided scope
> as
> > > the
> > > > > API
> > > > > > is
> > > > > > > > > > > included in
> > > > > > > > > > > JBoss AS 7 -->
> > > > > > > > > > > <dependency>
> > > > > > > > > > >
> > <groupId>org.jboss.spec.javax.resource</groupId>
> > > > > > > > > > >
> > > > > <artifactId>jboss-connector-api_1.6_spec</artifactId>
> > > > > > > > > > > <scope>provided</scope>
> > > > > > > > > > > </dependency>
> > > > > > > > > > > <dependency>
> > > > > > > > > > >
> <groupId>org.apache.incubator.kafka</groupId>
> > > > > > > > > > > <artifactId>kafka</artifactId>
> > > > > > > > > > > <version>0.7.0-incubating</version>
> > > > > > > > > > > </dependency>
> > > > > > > > > > > </dependencies>
> > > > > > > > > > >
> > > > > > > > > > > And here is the pom I'm using for kafka:
> > > > > > > > > > >
> > > > > > > > > > > <?xml version="1.0" encoding="UTF-8"?>
> > > > > > > > > > > <project xsi:schemaLocation="
> > > > http://maven.apache.org/POM/4.0.0
> > > > > > > > > > > http://maven.apache.org/xsd/maven-4.0.0.xsd"; xmlns="
> > > > > > > > > > > http://maven.apache.org/POM/4.0.0"; xmlns:xsi="
> > > > > > > > > > > http://www.w3.org/2001/XMLSchema-instance";>
> > > > > > > > > > > <modelVersion>4.0.0</modelVersion>
> > > > > > > > > > > <groupId>org.apache.incubator.kafka</groupId>
> > > > > > > > > > > <artifactId>kafka</artifactId>
> > > > > > > > > > > <packaging>pom</packaging>
> > > > > > > > > > > <version>0.7.0-incubating</version>
> > > > > > > > > > > <name>Apache Kafka</name>
> > > > > > > > > > > <description>Apache Kafka is a distributed
> > > > publish-subscribe
> > > > > > > > > messaging
> > > > > > > > > > > system</description>
> > > > > > > > > > > <url>http://incubator.apache.org/kafka</url>
> > > > > > > > > > > <inceptionYear>2012</inceptionYear>
> > > > > > > > > > > <licenses>
> > > > > > > > > > > <license>
> > > > > > > > > > > <name>The Apache Software License, Version
> > > > > 2.0</name>
> > > > > > > > > > > <url>
> > > > http://www.apache.org/licenses/LICENSE-2.0.txt
> > > > > > > </url>
> > > > > > > > > > > </license>
> > > > > > > > > > > </licenses>
> > > > > > > > > > > <dependencies>
> > > > > > > > > > > <dependency>
> > > > > > > > > > > <groupId>org.scala-lang</groupId>
> > > > > > > > > > > <artifactId>scala-library</artifactId>
> > > > > > > > > > > <version>2.8.0</version>
> > > > > > > > > > > </dependency>
> > > > > > > > > > > <dependency>
> > > > > > > > > > > <groupId>com.github.sgroschupf</groupId>
> > > > > > > > > > > <artifactId>zkclient</artifactId>
> > > > > > > > > > > <version>0.1</version>
> > > > > > > > > > > </dependency>
> > > > > > > > > > > </dependencies>
> > > > > > > > > > > <scm>
> > > > > > > > > > > <connection>scm:svn:
> > > > > > > > > > > http://svn.apache.org/repos/asf/incubator/kafka/trunk
> > > > > > </connection>
> > > > > > > > > > > <developerConnection>scm:svn:
> > > > > > > > > > > http://svn.apache.org/repos/asf/incubator/kafka/trunk
> > > > > > > > > > > </developerConnection>
> > > > > > > > > > > <url>
> > > > > > http://svn.apache.org/repos/asf/incubator/kafka/trunk
> > > > > > > > > </url>
> > > > > > > > > > > </scm>
> > > > > > > > > > > </project>
> > > > > > > > > > >
> > > > > > > > > > > Again, any input would be greatly appreciated. Thanks.
> > > > > > > > > > >
> > > > > > > > > > > On Tue, May 8, 2012 at 6:34 PM, Jun Rao <
> > jun...@gmail.com>
> > > > > > wrote:
> > > > > > > > > > >
> > > > > > > > > > > > Could you put consumer run() code in try/catch and
> log
> > > all
> > > > > > > > > throwables?
> > > > > > > > > > > > Executors can eat exceptions.
> > > > > > > > > > > >
> > > > > > > > > > > > Thanks,
> > > > > > > > > > > >
> > > > > > > > > > > > Jun
> > > > > > > > > > > >
> > > > > > > > > > > > On Tue, May 8, 2012 at 4:08 PM, lessonz <
> > > > > > > lessonz.leg...@gmail.com>
> > > > > > > > > > > wrote:
> > > > > > > > > > > >
> > > > > > > > > > > > > After trying and failing to get a more complicated
> > > > consumer
> > > > > > > > > working,
> > > > > > > > > > I
> > > > > > > > > > > > > decided to start at square one and use the example
> > > code.
> > > > > > Below
> > > > > > > is
> > > > > > > > > my
> > > > > > > > > > > > barely
> > > > > > > > > > > > > modified implementation:
> > > > > > > > > > > > >
> > > > > > > > > > > > > import java.util.Collections;
> > > > > > > > > > > > > import java.util.List;
> > > > > > > > > > > > > import java.util.Map;
> > > > > > > > > > > > > import java.util.Properties;
> > > > > > > > > > > > > import java.util.concurrent.ExecutorService;
> > > > > > > > > > > > > import java.util.concurrent.Executors;
> > > > > > > > > > > > > import java.util.logging.Logger;
> > > > > > > > > > > > >
> > > > > > > > > > > > > import kafka.consumer.Consumer;
> > > > > > > > > > > > > import kafka.consumer.ConsumerConfig;
> > > > > > > > > > > > > import kafka.consumer.KafkaMessageStream;
> > > > > > > > > > > > > import kafka.javaapi.consumer.ConsumerConnector;
> > > > > > > > > > > > > import kafka.message.Message;
> > > > > > > > > > > > > import kafka.serializer.DefaultDecoder;
> > > > > > > > > > > > >
> > > > > > > > > > > > > public class KafkaTestConsumer {
> > > > > > > > > > > > >
> > > > > > > > > > > > > /**
> > > > > > > > > > > > > * @param args
> > > > > > > > > > > > > */
> > > > > > > > > > > > > public static void main(final String[] args) {
> > > > > > > > > > > > > final Logger logger =
> > > > > > > > Logger.getLogger("KafkaTestConsumer");
> > > > > > > > > > > > >
> > > > > > > > > > > > > // specify some consumer properties
> > > > > > > > > > > > > final Properties props = new Properties();
> > > > > > > > > > > > > props.put("zk.connect", "testserver:2181");
> > > > > > > > > > > > > props.put("zk.connectiontimeout.ms",
> > > "1000000");
> > > > > > > > > > > > > props.put("groupid", "test_group");
> > > > > > > > > > > > >
> > > > > > > > > > > > > // Create the connection to the cluster
> > > > > > > > > > > > > final ConsumerConfig consumerConfig = new
> > > > > > > > > > ConsumerConfig(props);
> > > > > > > > > > > > > final ConsumerConnector consumerConnector =
> > > > > > > > > > > > >
> Consumer.createJavaConsumerConnector(consumerConfig);
> > > > > > > > > > > > >
> > > > > > > > > > > > > // create 4 partitions of the stream for
> topic
> > > > > > > > “testTopic”,
> > > > > > > > > to
> > > > > > > > > > > > > allow 4
> > > > > > > > > > > > > // threads to consume
> > > > > > > > > > > > > final String topicName = "testTopic";
> > > > > > > > > > > > > final int numStreams = 4;
> > > > > > > > > > > > > List<KafkaMessageStream<Message>> streams =
> > > null;
> > > > > > > > > > > > > try {
> > > > > > > > > > > > > final Map<String,
> > > > > > List<KafkaMessageStream<Message>>>
> > > > > > > > > > > > > topicMessageStreams = consumerConnector
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > .createMessageStreams(Collections.singletonMap(topicName,
> > > > > > > > > > numStreams),
> > > > > > > > > > > > new
> > > > > > > > > > > > > DefaultDecoder());
> > > > > > > > > > > > > streams =
> > > topicMessageStreams.get(topicName);
> > > > > > > > > > > > > } catch (final Exception e) {
> > > > > > > > > > > > > logger.severe(e.getMessage());
> > > > > > > > > > > > > }
> > > > > > > > > > > > >
> > > > > > > > > > > > > // create list of 4 threads to consume from
> > each
> > > > of
> > > > > > the
> > > > > > > > > > > partitions
> > > > > > > > > > > > > final ExecutorService executor =
> > > > > > > > > > > > > Executors.newFixedThreadPool(numStreams);
> > > > > > > > > > > > >
> > > > > > > > > > > > > // consume the messages in the threads
> > > > > > > > > > > > > for (final KafkaMessageStream<Message>
> stream
> > :
> > > > > > > streams) {
> > > > > > > > > > > > > executor.submit(new Runnable() {
> > > > > > > > > > > > > @Override
> > > > > > > > > > > > > public void run() {
> > > > > > > > > > > > > for (final Message message :
> > > stream) {
> > > > > > > > > > > > > logger.severe("!");
> > > > > > > > > > > > >
> > > logger.severe(message.toString());
> > > > > > > > > > > > > }
> > > > > > > > > > > > > }
> > > > > > > > > > > > > });
> > > > > > > > > > > > > }
> > > > > > > > > > > > > }
> > > > > > > > > > > > >
> > > > > > > > > > > > > }
> > > > > > > > > > > > >
> > > > > > > > > > > > > It runs, I get no errors, and nothing happens. I
> > don't
> > > > get
> > > > > > any
> > > > > > > > > > > messages.
> > > > > > > > > > > > I
> > > > > > > > > > > > > don't THINK it's an issue with my Kafka install for
> > two
> > > > > > > reasons:
> > > > > > > > 1.
> > > > > > > > > > > > > Zookeeper logs my client connection. 2. (Granted
> it's
> > > all
> > > > > on
> > > > > > > > > > localhost
> > > > > > > > > > > > but)
> > > > > > > > > > > > > When I used the console consumer and producer on
> the
> > > > > > instance,
> > > > > > > > they
> > > > > > > > > > > seem
> > > > > > > > > > > > to
> > > > > > > > > > > > > work just fine.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Methodology is to start Zookeeper, start Kafka,
> start
> > > > above
> > > > > > > > > > > application,
> > > > > > > > > > > > > and then connect a console produce to generate
> > > messages.
> > > > > I'm
> > > > > > > > really
> > > > > > > > > > at
> > > > > > > > > > > a
> > > > > > > > > > > > > loss as to what's happening. Interestingly, if I
> put
> > in
> > > > > > > > > breakpoints,
> > > > > > > > > > I
> > > > > > > > > > > > seem
> > > > > > > > > > > > > to lose a handle as I eventually lose the ability
> to
> > > step
> > > > > > over,
> > > > > > > > > step
> > > > > > > > > > > > into,
> > > > > > > > > > > > > and so on.
> > > > > > > > > > > > >
> > > > > > > > > > > > > I'd really appreciate any input.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Cheers.
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
