[英]Commit to kafka consumer after response from MongoSink - alpakka mongo connector
I am using alpakka connector to consume packets from Kafka and insert them into Mongo db. 我正在使用alpakka连接器来使用来自Kafka的数据包并将它们插入到Mongo数据库中。 I was trying to commit the offset after getting response from Mongo db but couldn't find anything regarding the same.
我在收到Mongo db的响应之后试图提交偏移但是找不到任何相同的内容。 How can I make sure that offset will be committed only after the packet successfully inserted to the Mongodb?
如何确保只有在数据包成功插入Mongodb后才会提交偏移量?
I am using Consumer.CommittableSource as a source and MongoSink as a sink and running the stream using RunnableGraph. 我使用Consumer.CommittableSource作为源,使用MongoSink作为接收器并使用RunnableGraph运行流。 Please refer the code for more clarification.
请参阅代码以获得更多说明。
Source: 资源:
public Source<ConsumerMessage.CommittableMessage<String, String>, Consumer.Control> source() {
return Consumer.committableSource(consumerSettings, subscription);
}
Flow: 流:
public Flow<ConsumerMessage.CommittableMessage, String, NotUsed> transformation() {
return Flow.of(ConsumerMessage.CommittableMessage.class).map(i -> i.record().value().toString());
}
Sink: 下沉:
public Sink<String, CompletionStage<Done>> sink() {
return MongoSink.insertOne(mongoCollection);
}
Graph: 图形:
RunnableGraph graph = RunnableGraph.fromGraph(GraphDSL.create(sink(), (builder, s) -> {
builder.from(builder.add(source()).out()).via(builder.add(transformation())).to(s);
return ClosedShape.getInstance();
}));
graph.run(ActorMaterializer.create(actorSystem));
EDIT : 编辑 :
Using PassThroughFlow, insertion to Mongo is working and it is not giving any exception or error but still not able to commit the packet. 使用PassThroughFlow,插入Mongo正在工作,它没有给出任何异常或错误,但仍然无法提交数据包。 transformationCommit() function has never been called.
从未调用过transformationCommit()函数。
Updated Flow : 更新流程:
public Flow<String, String, NotUsed> transformationMongo() {
LOGGER.info("Insert into Mongo");
return MongoFlow.insertOne(connection.getDbConnection());
}
public Flow<ConsumerMessage.CommittableMessage, ConsumerMessage.CommittableOffset, NotUsed> transformationCommit() {
return Flow.of(ConsumerMessage.CommittableMessage.class).map(i -> i.committableOffset());
}
Sink: 下沉:
public Sink<ConsumerMessage.CommittableOffset, CompletionStage<Done>> sinkCommit() {
CommitterSettings committerSettings = CommitterSettings.create(actorSystem);
return Committer.sink(committerSettings);
}
PassThroughFlow: PassThroughFlow:
public class PassThroughFlow {
public Graph<FlowShape<ConsumerMessage.CommittableMessage, ConsumerMessage.CommittableMessage>, NotUsed> apply(Flow<ConsumerMessage.CommittableMessage, String, NotUsed> flow) {
return Flow.fromGraph(GraphDSL.create(builder -> {
UniformFanOutShape broadcast = builder.add(Broadcast.create(2));
FanInShape2 zip = builder.add(ZipWith.create((left, right) -> Keep.right()));
builder.from(broadcast.out(0)).via(builder.add(flow)).toInlet(zip.in0());
builder.from(broadcast.out(1)).toInlet(zip.in1());
return FlowShape.apply(broadcast.in(), zip.out());
}));
}
}
Graph: 图形:
RunnableGraph graph = RunnableGraph.fromGraph(GraphDSL.create(sinkCommit(), (builder, s) -> {
builder.from(builder.add(source()).out()).via(builder.add(passThroughFlow.apply(transformation().via(transformationMongo())))).via(builder.add(transformationCommit())).to(sales);
return ClosedShape.getInstance();
}));
graph.run(ActorMaterializer.create(actorSystem));
//Insertion to mongo is working but still the packet not committed. transformationCommit() function has never been called.
而不是MongoSink
,使用MongoFlow
,它允许您继续流,然后您将能够提交偏移。
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