flume连接kafka报错 Excessively large list allocation request detected: 1818583411 items! Connection clos

1.问题描述：

flume然后sinkTokafka，flume是1.6.0然后kafka是0.8.2.1。flume和kafka自测都没有问题，但是flumeTokafka就会：

2018-11-21 01:09:16,119 (lifecycleSupervisor-1-1) [INFO - kafka.utils.Logging$class.info(Logging.scala:68)] Property key.serializer.class is overridden to kafka.serializer.StringEncoder
2018-11-21 01:09:16,119 (lifecycleSupervisor-1-1) [INFO - kafka.utils.Logging$class.info(Logging.scala:68)] Property metadata.broker.list is overridden to hadoop:9092
2018-11-21 01:09:16,119 (lifecycleSupervisor-1-1) [INFO - kafka.utils.Logging$class.info(Logging.scala:68)] Property request.required.acks is overridden to 1
2018-11-21 01:09:16,119 (lifecycleSupervisor-1-1) [INFO - kafka.utils.Logging$class.info(Logging.scala:68)] Property serializer.class is overridden to kafka.serializer.DefaultEncoder
2018-11-21 01:09:16,188 (lifecycleSupervisor-1-1) [INFO - org.apache.flume.instrumentation.MonitoredCounterGroup.register(MonitoredCounterGroup.java:120)] Monitored counter group for type: SINK, name: kafka-sink: Successfully registered new MBean.
2018-11-21 01:09:16,188 (lifecycleSupervisor-1-1) [INFO - org.apache.flume.instrumentation.MonitoredCounterGroup.start(MonitoredCounterGroup.java:96)] Component type: SINK, name: kafka-sink started
2018-11-21 01:09:16,189 (lifecycleSupervisor-1-0) [INFO - org.apache.flume.instrumentation.MonitoredCounterGroup.register(MonitoredCounterGroup.java:120)] Monitored counter group for type: SOURCE, name: avro-source: Successfully registered new MBean.
2018-11-21 01:09:16,189 (lifecycleSupervisor-1-0) [INFO - org.apache.flume.instrumentation.MonitoredCounterGroup.start(MonitoredCounterGroup.java:96)] Component type: SOURCE, name: avro-source started
2018-11-21 01:09:16,189 (lifecycleSupervisor-1-0) [INFO - org.apache.flume.source.AvroSource.start(AvroSource.java:253)] Avro source avro-source started.
2018-11-21 01:09:37,874 (New I/O server boss #9) [INFO - org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.handleUpstream(NettyServer.java:171)] [id: 0x83134623, /172.16.0.147:55290 => /172.16.0.147:41414] OPEN
2018-11-21 01:09:37,875 (New I/O worker #1) [INFO - org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.handleUpstream(NettyServer.java:171)] [id: 0x83134623, /172.16.0.147:55290 => /172.16.0.147:41414] BOUND: /172.16.0.147:41414
2018-11-21 01:09:37,875 (New I/O worker #1) [INFO - org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.handleUpstream(NettyServer.java:171)] [id: 0x83134623, /172.16.0.147:55290 => /172.16.0.147:41414] CONNECTED: /172.16.0.147:55290
2018-11-21 01:09:44,010 (New I/O worker #1) [INFO - org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.handleUpstream(NettyServer.java:171)] [id: 0x83134623, /172.16.0.147:55290 :> /172.16.0.147:41414] DISCONNECTED
2018-11-21 01:09:44,010 (New I/O worker #1) [INFO - org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.handleUpstream(NettyServer.java:171)] [id: 0x83134623, /172.16.0.147:55290 :> /172.16.0.147:41414] UNBOUND
2018-11-21 01:09:44,010 (New I/O worker #1) [INFO - org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.handleUpstream(NettyServer.java:171)] [id: 0x83134623, /172.16.0.147:55290 :> /172.16.0.147:41414] CLOSED
2018-11-21 01:09:44,010 (New I/O worker #1) [INFO - org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.channelClosed(NettyServer.java:209)] Connection to /172.16.0.147:55290 disconnected.
2018-11-21 01:09:44,012 (New I/O worker #1) [WARN - org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.exceptionCaught(NettyServer.java:201)] Unexpected exception from downstream.
org.apache.avro.AvroRuntimeException: Excessively large list allocation request detected: 1818583411 items! Connection closed.
        at org.apache.avro.ipc.NettyTransportCodec$NettyFrameDecoder.decodePackHeader(NettyTransportCodec.java:167)
        at org.apache.avro.ipc.NettyTransportCodec$NettyFrameDecoder.decode(NettyTransportCodec.java:139)
        at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:425)
        at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
        at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
        at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
        at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
        at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:107)
        at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
        at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:88)
        at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

2.环境

（1）flume的配置

avro-memory-kafka.sources = avro-source
avro-memory-kafka.sinks = kafka-sink
avro-memory-kafka.channels = memory-channel

avro-memory-kafka.sources.avro-source.type = avro
avro-memory-kafka.sources.avro-source.bind = hadoop
avro-memory-kafka.sources.avro-source.port = 41414

avro-memory-kafka.sinks.kafka-sink.type = org.apache.flume.sink.kafka.KafkaSink
avro-memory-kafka.sinks.kafka-sink.brokerList = hadoop:9092
avro-memory-kafka.sinks.kafka-sink.topic = hello2
avro-memory-kafka.sinks.kafka-sink.batchSize = 5
avro-memory-kafka.sinks.kafka-sink.requiredAcks =1 

avro-memory-kafka.channels.memory-channel.type = memory

avro-memory-kafka.sources.avro-source.channels = memory-channel
avro-memory-kafka.sinks.kafka-sink.channel = memory-channel

（2）测试

telnet hadoop 41414
Trying 172.16.0.147...
Connected to hadoop.
Escape character is '^]'.
ffff
rrrr
Connection closed by foreign host.

3.原因

flume的avro sources和telnet的信息是不匹配的，这个是神坑爹的。

4.解决

flume的sources.type换成netcat即可！

收获就是需要仔细阅读文档。

最后

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