kafka consumer example

CONSUMERFETCHERMANAGER5. Generate timed tasks, according to the configuration of auto.commit.interval.ms to submit the displacement, the default is 1 minutes to submit the displacement to the zookeeper is to periodically save the consumed message displacement to zookeeper, the specific logic is very simple, This article does not dwell on here. We only care about the fourth step in the previous step-creating Consumerfetchermanager. So, what does Consumerfetchermanager do with it? As the name imp

, value=v) producer.flush ()exceptKafkaerror as E:Print(e)classKafka_consumer ():" ""Consumption module: Consumption of topic messages through different GroupID" " def __init__(self, kafkahost, Kafkaport, Kafkatopic, GroupID): Self.kafkahost=kafkahost Self.kafkaport=Kafkaport self.kafkatopic=kafkatopic self.groupid=GroupID Self.key=Key Self.consumer= Kafkaconsumer (self.kafkatopic, group_id =Self.groupid, Bootstrap_servers='{Kafka_host}:{kafka_port}'. Format (kafka_host=Self.kafkahost, Kafka_

Import threadingFrom Kafka import KafkaconsumerThreads = []Class MyThread (threading. Thread):def __init__ (self, ThreadName, keyName):Threading. Thread.__init__ (self)Self.threadname=threadnameSelf.keyname=keynamedef run (self):Receiveinfo (Self.threadname, Self.keyname)def receiveinfo (ThreadName, KeyName):Consumer = kafkaconsumer (' Test ', bootstrap_servers= ' 192.168.1.10:9092 ')For MSG in consumer:If

In the use of Kafka high-level consumer, the use of multi-threaded consumption data times wrong, simple analysis of the reason for download , Consumeriterator will not be blocked when the message and set the internal state to failed, which throws an exception when other threads access it.Java code 650) this.width=650; "class=" star "src=" Http://woodding2008.iteye.com/images/icon_star.png "alt=" Favorites

Error phenomenon:Java client programming as the consumer of Kafka, connecting Kafka's broker error650) this.width=650; "Src=" https://s4.51cto.com/wyfs02/M00/91/6A/wKiom1j12BGgUkKgAACUSA5Q0tU565.png-wh_500x0-wm_ 3-wmp_4-s_64493172.png "title=" Qq20170418170758.png "alt=" Wkiom1j12bggukkgaacusa5q0tu565.png-wh_50 "/>Error reason analysis:When the server configuration or network environment is poor, there will

)); Stringdecoder Keydecoder = new Stringdecoder (new Verifiableproperties ());Stringdecoder Valuedecoder = new Stringdecoder (new Verifiableproperties ()); MapConsumer.createmessagestreams (Topiccountmap,keydecoder,valuedecoder);kafkastreamConsumeriterator int messagecount = 0;while (It.hasnext ()) {System.out.println (It.next (). message ());messagecount++;if (Messagecount = = 100) {SYSTEM.OUT.PRINTLN ("Consumer end of the total consumption of" + Me

The producers are as follows: public class KafkaProduce1 {public static void Main (string[] args) throws ioexception{ String topic= "test"; Properties prop = new properties (); Prop.load (KafkaProduce1.class.getClassLoader (). getResourceAsStream ("producer.properties")); producer The producer.properies configuration is as follows: # List of brokers used for bootstrapping knowledge about the rest of the cluster # FORMAT:HOST1:PORT1,HOST2:PORT2. . metad

Producer}public static void Main (string[] args) {New Kafkaproducer ("Test"). Start ();}}ConsumerImport Java.util.HashMap;Import java.util.List;Import Java.util.Map;Import java.util.Properties;Import Kafka.consumer.Consumer;Import Kafka.consumer.ConsumerConfig;Import Kafka.consumer.ConsumerIterator;Import Kafka.consumer.KafkaStream;Import Kafka.javaapi.consumer.ConsumerConnector;public class Kafkacomsumer extends Thread {Private String topic;Public Kafkacomsumer (String topic) {this.topic = top

Producer}public static void Main (string[] args) {New Kafkaproducer ("Test"). Start ();}}ConsumerImport Java.util.HashMap;Import java.util.List;Import Java.util.Map;Import java.util.Properties;Import Kafka.consumer.Consumer;Import Kafka.consumer.ConsumerConfig;Import Kafka.consumer.ConsumerIterator;Import Kafka.consumer.KafkaStream;Import Kafka.javaapi.consumer.ConsumerConnector;public class Kafkacomsumer extends Thread {Private String topic;Public Kafkacomsumer (String topic) {this.topic = top

Error process:650) this.width=650; "Src=" https://s1.51cto.com/wyfs02/M00/91/60/wKiom1j1sYHyYBNNAADoGsBpPEc665.png-wh_500x0-wm_ 3-wmp_4-s_1657427620.png "title=" Qq20170418142553.png "alt=" Wkiom1j1syhyybnnaadogsbppec665.png-wh_50 "/>Cause: Host name mapped IP error, resulting in no communication between nodesWorkaround: Configure IP and hostname mappings on each machineVi/etc/hosts650) this.width=650; "Src=" https://s2.51cto.com/wyfs02/M01/91/5F/wKioL1j1skjRcJXNAAAZuUAeA9Q879.png-wh_500x0-wm_ 3

01:37:39,386 (pool-4-thread-1) [INFO- Org.apache.flume.client.avro.ReliableSpoolingFileEventReader.readEvents(reliablespoolingfileeventreader.java:258)] Last read took us just up to a file boundary. Rolling to the next file, if there is one.2017-10-23 01:37:39,386 (pool-4-thread-1) [INFO- Org.apache.flume.client.avro.ReliableSpoolingFileEventReader.rollCurrentFile(reliablespoolingfileeventreader.java:348)] Preparing to move File/flume/web_spooldir/2014-03-09.log to/flume/web_spooldir/2014-03-09