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https://issues.apache.org/jira/browse/FLUME-1494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453829#comment-13453829
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Rudolf Rákos commented on FLUME-1494:
-------------------------------------
I think a time threshold setting would be a nice, and it's fairly easy to
implement.
> Avro sink logs error messages on connection failure
> ---------------------------------------------------
>
> Key: FLUME-1494
> URL: https://issues.apache.org/jira/browse/FLUME-1494
> Project: Flume
> Issue Type: Wish
> Components: Sinks+Sources
> Affects Versions: v1.1.0, v1.2.0, v1.3.0
> Reporter: Rudolf Rákos
> Priority: Minor
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> The Avro sink emits error level log messages every few seconds when it loses
> connection to the next hop Avro source. When the Avro sink tries to
> (re)connect to the source and fails, it logs an error message.
> Using a file channel or any persistent channel before the Avro sink
> guarantees the transactional behavior and 100% delivery. So the messages will
> be delivered when the next hop Avro source comes online.
> This error level log message is problematic for us for two reasons:
> * This is not really an error, because no message (event) is lost. The outage
> of the next hop Avro source should not be notified or handled on the Avro
> sink's side.
> * We have an alerting system which works by examining log messages (it is a
> Logback appender), and alerts our support team when errors are logged. We
> could blacklist this error message, but I don't think that is a permanent
> solution for the problem.
> Currently there is no way to configure Flume to only log a warning level log
> message or only log this error once.
> The log message:
> {quote}
> 2012-08-16 14:33:26,192 [SinkRunner-PollingRunner-DefaultSinkProcessor] ERROR
> org.apache.flume.SinkRunner - Unable to deliver event. Exception follows.
> org.apache.flume.EventDeliveryException: Failed to send events
> at org.apache.flume.sink.AvroSink.process(AvroSink.java:325)
> ~[flume-ng-core-1.2.0.jar:1.2.0]
> at
> org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:68)
> ~[flume-ng-core-1.2.0.jar:1.2.0]
> at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:147)
> ~[flume-ng-core-1.2.0.jar:1.2.0]
> at java.lang.Thread.run(Thread.java:662) [na:1.6.0_31]
> Caused by: org.apache.flume.FlumeException: NettyAvroRpcClient \{ host:
> localhost, port: 11113 }: RPC connection error
> at
> org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:117)
> ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> at
> org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:93)
> ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> at
> org.apache.flume.api.NettyAvroRpcClient.configure(NettyAvroRpcClient.java:507)
> ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> at
> org.apache.flume.api.RpcClientFactory.getInstance(RpcClientFactory.java:88)
> ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> at org.apache.flume.sink.AvroSink.createConnection(AvroSink.java:182)
> ~[flume-ng-core-1.2.0.jar:1.2.0]
> at org.apache.flume.sink.AvroSink.verifyConnection(AvroSink.java:222)
> ~[flume-ng-core-1.2.0.jar:1.2.0]
> at org.apache.flume.sink.AvroSink.process(AvroSink.java:282)
> ~[flume-ng-core-1.2.0.jar:1.2.0]
> ... 3 common frames omitted
> Caused by: java.io.IOException: Error connecting to /127.0.0.1:11113
> at org.apache.avro.ipc.NettyTransceiver.getChannel(NettyTransceiver.java:249)
> ~[avro-ipc-1.6.3.jar:1.6.3]
> at org.apache.avro.ipc.NettyTransceiver.<init>(NettyTransceiver.java:198)
> ~[avro-ipc-1.6.3.jar:1.6.3]
> at org.apache.avro.ipc.NettyTransceiver.<init>(NettyTransceiver.java:147)
> ~[avro-ipc-1.6.3.jar:1.6.3]
> at
> org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:106)
> ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> ... 9 common frames omitted
> Caused by: java.net.ConnectException: Connection refused: no further
> information
> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.6.0_31]
> at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
> ~[na:1.6.0_31]
> at
> org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.connect(NioClientSocketPipelineSink.java:401)
> ~[netty-3.2.7.Final.jar:na]
> at
> org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:370)
> ~[netty-3.2.7.Final.jar:na]
> at
> org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:292)
> ~[netty-3.2.7.Final.jar:na]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> ~[na:1.6.0_31]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> ~[na:1.6.0_31]
> ... 1 common frames omitted
> {quote}
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