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From prateek arora <prateek.arora...@gmail.com>
Subject Re: Getting java.lang.Exception when try to fetch data from Kafka
Date Tue, 26 Apr 2016 16:34:27 GMT
Hi Robert ,

Hi

I have java program to send data into kafka topic. below is code for this :

private Producer<String, byte[]> producer = null

Serializer<String> keySerializer = new StringSerializer();
Serializer<byte[]> valueSerializer = new ByteArraySerializer();
producer = new KafkaProducer<String, byte[]>(props, keySerializer,
valueSerializer);

ProducerRecord<String, byte[]> imageRecord;
imageRecord = new ProducerRecord<String, byte[]>(streamInfo.topic,
                        Integer.toString(messageKey), imageData);

producer.send(imageRecord);


then trying to fetch data in Apache flink .

Regards
Prateek

On Mon, Apr 25, 2016 at 2:42 AM, Robert Metzger <rmetzger@apache.org> wrote:

> Hi Prateek,
>
> were the messages written to the Kafka topic by Flink, using the
> TypeInformationKeyValueSerializationSchema ? If not, maybe the Flink
> deserializers expect a different data format of the messages in the topic.
>
> How are the messages written into the topic?
>
>
> On Fri, Apr 22, 2016 at 10:21 PM, prateekarora <prateek.arora2k6@gmail.com
> > wrote:
>
>>
>> Hi
>>
>> I am sending data using kafkaProducer API
>>
>>                        imageRecord = new ProducerRecord<String,
>> byte[]>(topic,messageKey, imageData);
>>                         producer.send(imageRecord);
>>
>>
>> And in flink program  try to fect data using FlinkKafkaConsumer08 . below
>> are the sample code .
>>
>>     def main(args: Array[String]) {
>>           val env = StreamExecutionEnvironment.getExecutionEnvironment
>>           val properties = new Properties()
>>           properties.setProperty("bootstrap.servers", "<IPADDRESS>:9092")
>>           properties.setProperty("zookeeper.connect", "<IPADDRESS>:2181")
>>           properties.setProperty("group.id", "test")
>>
>>           val readSchema = new
>>
>> TypeInformationKeyValueSerializationSchema[String,Array[Byte]](classOf[String],classOf[Array[Byte]],
>>
>> env.getConfig).asInstanceOf[KeyedDeserializationSchema[(String,Array[Byte])]]
>>
>>           val stream : DataStream[(String,Array[Byte])]  =
>> env.addSource(new
>> FlinkKafkaConsumer08[(String,Array[Byte])]("a-0",readSchema, properties))
>>
>>           stream.print
>>           env.execute("Flink Kafka Example")
>>   }
>>
>>
>> but getting  below error :
>>
>> 16/04/22 13:43:39 INFO ExecutionGraph: Source: Custom Source -> Sink:
>> Unnamed (1/4) (d7a151560f6eabdc587a23dc0975cb84) switched from RUNNING to
>> FAILED
>> 16/04/22 13:43:39 INFO ExecutionGraph: Source: Custom Source -> Sink:
>> Unnamed (2/4) (d43754a27e402ed5b02a73d1c9aa3125) switched from RUNNING to
>> CANCELING
>>
>> java.lang.Exception
>>     at
>>
>> org.apache.flink.streaming.connectors.kafka.internals.LegacyFetcher.run(LegacyFetcher.java:222)
>>     at
>>
>> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08.run(FlinkKafkaConsumer08.java:316)
>>     at
>>
>> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:78)
>>     at
>>
>> org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56)
>>     at
>>
>> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:225)
>>     at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
>>     at java.lang.Thread.run(Thread.java:745)
>> Caused by: java.io.EOFException
>>     at
>>
>> org.apache.flink.runtime.util.DataInputDeserializer.readUnsignedByte(DataInputDeserializer.java:298)
>>     at org.apache.flink.types.StringValue.readString(StringValue.java:771)
>>     at
>>
>> org.apache.flink.api.common.typeutils.base.StringSerializer.deserialize(StringSerializer.java:69)
>>     at
>>
>> org.apache.flink.api.common.typeutils.base.StringSerializer.deserialize(StringSerializer.java:28)
>>     at
>>
>> org.apache.flink.streaming.util.serialization.TypeInformationKeyValueSerializationSchema.deserialize(TypeInformationKeyValueSerializationSchema.java:105)
>>     at
>>
>> org.apache.flink.streaming.util.serialization.TypeInformationKeyValueSerializationSchema.deserialize(TypeInformationKeyValueSerializationSchema.java:39)
>>     at
>>
>> org.apache.flink.streaming.connectors.kafka.internals.LegacyFetcher$SimpleConsumerThread.run(LegacyFetcher.java:657)
>>
>>
>> Regards
>> Prateek
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Getting-java-lang-Exception-when-try-to-fetch-data-from-Kafka-tp6365.html
>> Sent from the Apache Flink User Mailing List archive. mailing list
>> archive at Nabble.com.
>>
>
>

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