双层flume搭建过程中遇到的坑

INFO - Creating /user/hive/warehouse/ods.db/origin_user_behavior/19-04-19/events.1555671386480.tmp
ERROR - Avro source r2: Unable to process event batch. Exception follows.
org.apache.flume.ChannelFullException: Space for commit to queue couldn't be acquired. Sinks are likely not keeping up with sources, or the buffer size is too tight
    at org.apache.flume.channel.MemoryChannel$MemoryTransaction.doCommit(MemoryChannel.java:127)
    at org.apache.flume.channel.BasicTransactionSemantics.commit(BasicTransactionSemantics.java:151)
    at org.apache.flume.channel.ChannelProcessor.processEventBatch(ChannelProcessor.java:194)
    at org.apache.flume.source.AvroSource.appendBatch(AvroSource.java:393)
    at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.avro.ipc.specific.SpecificResponder.respond(SpecificResponder.java:91)
    at org.apache.avro.ipc.Responder.respond(Responder.java:151)
    at org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.messageReceived(NettyServer.java:188)
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
    at org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.handleUpstream(NettyServer.java:173)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
    at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
    at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
    at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
    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:108)
    at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
    at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
    at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

解决方法：
先将flume的JVM内存改为512M

capacity = 1000
transactionCapacity = 1000
keep-alive = 30

ERROR - Unable to deliver event. Exception follows.
org.apache.flume.EventDeliveryException: Failed to send events
    at org.apache.flume.sink.AbstractRpcSink.process(AbstractRpcSink.java:389)
    at org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67)
    at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flume.EventDeliveryException: NettyAvroRpcClient { host: hadoop104, port: 4545 }: Failed to send batch
    at org.apache.flume.api.NettyAvroRpcClient.appendBatch(NettyAvroRpcClient.java:314)
    at org.apache.flume.sink.AbstractRpcSink.process(AbstractRpcSink.java:373)
    ... 3 more
Caused by: org.apache.flume.EventDeliveryException: NettyAvroRpcClient { host: hadoop104, port: 4545 }: Avro RPC call returned Status: FAILED
    at org.apache.flume.api.NettyAvroRpcClient.waitForStatusOK(NettyAvroRpcClient.java:390)
    at org.apache.flume.api.NettyAvroRpcClient.appendBatch(NettyAvroRpcClient.java:373)
    at org.apache.flume.api.NettyAvroRpcClient.appendBatch(NettyAvroRpcClient.java:302)
    ... 4 more

请求超时,导致发送event失败
解决：
设置request-timeout长一点，默认20秒