先贴上异常信息
1 08 May 2015 17:55:23,751 WARN [New I/O worker #1] (org.apache.flume.source.AvroSource.append:350) - Avro source r1: Unable to process event. Exception follows. 2 org.apache.flume.ChannelException: Unable to put event on required channel: org.apache.flume.channel.MemoryChannel{name: c2} 3 at org.apache.flume.channel.ChannelProcessor.processEvent(ChannelProcessor.java:275) 4 at org.apache.flume.source.AvroSource.append(AvroSource.java:348) 5 at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source) 6 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 7 at java.lang.reflect.Method.invoke(Method.java:606) 8 at org.apache.avro.ipc.specific.SpecificResponder.respond(SpecificResponder.java:88) 9 at org.apache.avro.ipc.Responder.respond(Responder.java:149) 10 at org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.messageReceived(NettyServer.java:188) 11 at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) 12 at org.apache.avro.ipc.NettyServer$NettyServerAvroHandler.handleUpstream(NettyServer.java:173) 13 at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:558) 14 at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:786) 15 at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296) 16 at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:458) 17 at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:439) 18 at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:311) 19 at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) 20 at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:558) 21 at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:553) 22 at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) 23 at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) 24 at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:84) 25 at org.jboss.netty.channel.socket.nio.AbstractNioWorker.processSelectedKeys(AbstractNioWorker.java:471) 26 at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:332) 27 at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:35) 28 at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102) 29 at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) 30 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 31 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 32 at java.lang.Thread.run(Thread.java:745) 33 Caused by: 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 34 at org.apache.flume.channel.MemoryChannel$MemoryTransaction.doCommit(MemoryChannel.java:130) 35 at org.apache.flume.channel.BasicTransactionSemantics.commit(BasicTransactionSemantics.java:151) 36 at org.apache.flume.channel.ChannelProcessor.processEvent(ChannelProcessor.java:267) 37 ... 29 more
问题分析
从标红部分大致可以看出，MemoryChannel满了，source写不进去。
从程序运行表现来看，可能导致flume堵死，不能传输日志了(我遇到的现象)
解决办法
参考 http://blog.csdn.net/hijk139/article/details/8465094
增大MemoryChannel的容量，增加处理时间
修改配置文件
# channel c2 的配置 a1.channels.c2.type = memory a1.channels.c2.capacity = 1000000 a1.channels.c2.transactionCapacity = 80000 a1.channels.c2.keep-alive = 30