Thanks for the response . can you please suggest some link or example to write own DeserializationSchema ?
Regards Prateek On Tue, Apr 26, 2016 at 11:06 AM, rmetzger0 [via Apache Flink User Mailing List archive.] <ml-node+s2336050n6464...@n4.nabble.com> wrote: > Hi Prateek, > > sorry for the late response. Can you try implementing your own > DeserializationSchema, where you deserialize the String key manually (just > call the "new String(byte[]) constructor). > > The TypeInformationKeyValueSerializationSchema[String, byte] is > generating deserializers with Flink's internal serializer stack (these > assume that the data has been serialized by Flink as well). I think Flink's > StringSerializer does some fancy optimizations and is not compatible with > the standard String() format. > > > > On Tue, Apr 26, 2016 at 6:34 PM, prateek arora <[hidden email] > <http:///user/SendEmail.jtp?type=node&node=6464&i=0>> wrote: > >> 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 <[hidden email] >> <http:///user/SendEmail.jtp?type=node&node=6464&i=1>> 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 <[hidden email] >>> <http:///user/SendEmail.jtp?type=node&node=6464&i=2>> 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. >>>> >>> >>> >> > > > ------------------------------ > If you reply to this email, your message will be added to the discussion > below: > > 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