我需要一些幫助,使用Scala代碼將數據從輸出NiFi端口傳輸到Flink。連接到NiFi連接器
我卡在.addSource()
函數。它要求額外的參數([OUT]),但是當我提供它們時,我不斷收到錯誤。下面是Scala代碼和錯誤消息。
package flinkTest
import java.nio.charset.{Charset, StandardCharsets}
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment
import org.apache.flink.streaming.api.scala.DataStream
import org.apache.flink.streaming.connectors.nifi.NiFiSource
import org.apache.flink.streaming.api.functions.source.SourceFunction
import org.apache.flink.streaming.connectors.nifi.NiFiDataPacket
import org.apache.nifi.remote.client.{SiteToSiteClient, SiteToSiteClientConfig}
object NifiFlow {
def main(): Unit = {
// get the execution environment
val env: StreamExecutionEnvironment =
StreamExecutionEnvironment.getExecutionEnvironment
// get input data by connecting to NiFi
val clientConfig: SiteToSiteClientConfig = new SiteToSiteClient.Builder()
.url("http://localhost:8080/nifi")
.portName("Data to flink")
.requestBatchCount(2)
.buildConfig()
val nifiSource: SourceFunction[NiFiDataPacket] = new NiFiSource(clientConfig)
這裏的片
val streamSource: DataStream[NiFiDataPacket] =
env.addSource(nifiSource).setParallelism(2)
和一些更多的代碼
val dataStream = streamSource.map(dataPacket => new String(dataPacket.getContent, StandardCharsets.UTF_8))
dataStream.print()
env.execute()
}
}
1)使用[OUT]
Error:(28, 76) value nifiSource of type org.apache.flink.streaming.api.functions.source.SourceFunction[org.apache.flink.streaming.connectors.nifi.NiFiDataPacket] does not take type parameters.
val streamSource: DataStream[NiFiDataPacket] = env.addSource(nifiSource[NiFiDataPacket]).setParallelism(2)
2)在不[OUT]
Error:(28, 66) type mismatch;
found : org.apache.flink.streaming.api.functions.source.SourceFunction[org.apache.flink.streaming.connectors.nifi.NiFiDataPacket]
required: org.apache.flink.streaming.api.function.source.SourceFunction[?]
val streamSource: DataStream[NiFiDataPacket] = env.addSource(nifiSource).setParallelism(2)
示例採取了here並重寫爲Scala。
我會很感激任何建議。
UPD2
package flinkTest
import org.apache.nifi.remote.client.{SiteToSiteClient, SiteToSiteClientConfig}
import org.apache.flink.streaming.api.scala._
import org.apache.flink.streaming.connectors.nifi._
object NifiFlow {
def main(): Unit = {
// get the execution environment
val env: StreamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment
// get input data by connecting to NiFi
val clientConfig: SiteToSiteClientConfig = new SiteToSiteClient.Builder()
.url("http://localhost:8080/nifi")
.portName("Data to flink")
.requestBatchCount(2)
.buildConfig()
val nifiSource = new NiFiSource(clientConfig)
val streamSource: DataStream[String] = env
.addSource(nifiSource)
.map(x => x.getAttributes().toString)
env.execute()
}
}
ERROR
Connected to the target VM, address: '127.0.0.1:41218', transport: 'socket'
Exception in thread "main" org.apache.flink.api.common.functions.InvalidTypesException: Interfaces and abstract classes are not valid types: interface org.apache.flink.streaming.connectors.nifi.NiFiDataPacket
at org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:871)
at org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:863)
at org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:406)
at org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:197)
at org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:184)
at flinkTest.NifiFlow$.main(NiFiFlow.scala:23)
沒有幫助。它以某種方式不能轉換類型類。 錯誤:(37,38)類型不匹配; 找到:org.apache.flink.streaming.api.functions.source.SourceFunction [** org.apache.flink.streaming.connectors.nifi.NiFiDataPacket **] 必需:org.apache.flink.streaming.api。 function.source.SourceFunction [**?**] val streamSource = env.addSource(nifiSource) –
你可以附上一個完整的文件,修改後的代碼和完整的錯誤? – daggett
更新了最初的帖子。代碼太長,無法粘貼到評論中。 –