Which Flink version are you using (so that line numbers can be matched with
source code) ?
On Mon, Aug 28, 2017 at 9:16 AM, Sridhar Chellappa <flinken...@gmail.com>
wrote:
> DataStream<MyKafkaMessage> MyKafkaMessageDataStream = env.addSource(
> getStreamSource(env, parameterTool);
> );
>
>
>
> public RichParallelSourceFunction<MyKafkaMessage>
> getStreamSource(StreamExecutionEnvironment
> env, ParameterTool parameterTool) {
>
> // MyKAfkaMessage is a ProtoBuf message
>
> env.getConfig().registerTypeWithKryoSerializer(MyKafkaMessage.class,
> ProtobufSerializer.class);
>
> KafkaDataSource<MyKafkaMessage> flinkCepConsumer =
> new KafkaDataSource<MyKafkaMessage>(parameterTool,
> new MyKafkaMessageSerDeSchema());
>
> return flinkCepConsumer;
> }
>
>
> public class KafkaDataSource<T> extends FlinkKafkaConsumer010<T> {
>
> public KafkaDataSource(ParameterTool parameterTool,
> DeserializationSchema<T> deserializer) {
> super(
> Arrays.asList(parameterTool.getRequired("topic").split(","
> )),
> deserializer,
> parameterTool.getProperties()
> );
>
> }
>
> }
>
> public class MyKafkaMessageSerDeSchema implements
> DeserializationSchema<MyKafkaMessage>,
> SerializationSchema<MyKafkaMessage> {
>
> @Override
> public MyKafkaMessage deserialize(byte[] message) throws IOException {
> MyKafkaMessage MyKafkaMessage = null;
> try {
> MyKafkaMessage = MyKafkaMessage.parseFrom(message);
> } catch (InvalidProtocolBufferException e) {
> e.printStackTrace();
> } finally {
> return MyKafkaMessage;
> }
> }
>
> @Override
> public boolean isEndOfStream(MyKafkaMessage nextElement) {
> return false;
> }
>
> @Override
> public TypeInformation<MyKafkaMessage> getProducedType() {
> return null;
> }
>
> @Override
> public byte[] serialize(MyKafkaMessage element) {
> return new byte[0];
> }
> }
>
> On Mon, Aug 28, 2017 at 8:26 PM, Ted Yu <yuzhih...@gmail.com> wrote:
>
>> Which version of Flink / Kafka are you using ?
>>
>> Can you show the snippet of code where you create the DataStream ?
>>
>> Cheers
>>
>> On Mon, Aug 28, 2017 at 7:38 AM, Sridhar Chellappa <flinken...@gmail.com>
>> wrote:
>>
>>> Folks,
>>>
>>> I have a KafkaConsumer that I am trying to read messages from. When I
>>> try to create a DataStream from the KafkConsumer (env.addSource()) I get
>>> the following exception :
>>>
>>> Any idea on how can this happen?
>>>
>>> java.lang.NullPointerException
>>> at
>>> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:526)
>>> at
>>> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:503)
>>> at
>>> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:483)
>>> at
>>> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:891)
>>> at
>>> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:869)
>>> at
>>> org.apache.flink.streaming.api.operators.StreamSourceContexts$NonTimestampContext.collect(StreamSourceContexts.java:103)
>>> at
>>> org.apache.flink.streaming.api.operators.StreamSourceContexts$NonTimestampContext.collectWithTimestamp(StreamSourceContexts.java:110)
>>> at
>>> org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher.emitRecordWithTimestamp(AbstractFetcher.java:264)
>>> at
>>> org.apache.flink.streaming.connectors.kafka.internal.Kafka010Fetcher.emitRecord(Kafka010Fetcher.java:86)
>>> at
>>> org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.runFetchLoop(Kafka09Fetcher.java:149)
>>> at
>>> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:449)
>>> at
>>> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:87)
>>> at
>>> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:55)
>>> at
>>> org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:95)
>>> at
>>> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:262)
>>> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
>>> at java.lang.Thread.run(Thread.java:748)
>>>
>>>
>>
>
