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Re: Avro sink error
Hi Rudolf,

Unfortunately, the sink will try to connect to the source and when it fails it will log this error message. The sink would back off for a few seconds(it increases with each failure till a max of 5 seconds I think), but each time it tries to connect it will log this error. Please file a jira if you want this to be reduced to a WARN, so it can be discussed with other devs and if a consensus is reached, the current code can be patched to make this a warn.


Hari Shreedharan
On Thursday, August 16, 2012 at 5:34 AM, Rakos, Rudolf wrote:

> Hi All,
> We are developing a tool which embeds Flume. I have some questions about configuring Flume.
> The Avro sink emits error level log messages every few seconds when it loses connection to the next hop Avro source.
> Using a file 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.
> Is there a way to configure Flume to only log a warning level log message or only log this error once?
> The log message:
> 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$PollingRunner.run(SinkRunner.java:147) ~[flume-ng-core-1.2.0.jar:1.2.0]
> at java.lang.Thread.run(Thread.java:662) [na:1.6.0_31]
> Caused by: org.apache.flume.FlumeException: NettyAvroRpcClient { host: localhost, port: 11113 }: RPC connection error
> at org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:117) ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> at org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:93) ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> at org.apache.flume.api.NettyAvroRpcClient.configure(NettyAvroRpcClient.java:507) ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> at org.apache.flume.api.RpcClientFactory.getInstance(RpcClientFactory.java:88) ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> at org.apache.flume.sink.AvroSink.createConnection(AvroSink.java:182) ~[flume-ng-core-1.2.0.jar:1.2.0]
> at org.apache.flume.sink.AvroSink.verifyConnection(AvroSink.java:222) ~[flume-ng-core-1.2.0.jar:1.2.0]
> at org.apache.flume.sink.AvroSink.process(AvroSink.java:282) ~[flume-ng-core-1.2.0.jar:1.2.0]
> ... 3 common frames omitted
> Caused by: java.io.IOException: Error connecting to /
> at org.apache.avro.ipc.NettyTransceiver.getChannel(NettyTransceiver.java:249) ~[avro-ipc-1.6.3.jar:1.6.3]
> at org.apache.avro.ipc.NettyTransceiver.<init>(NettyTransceiver.java:198) ~[avro-ipc-1.6.3.jar:1.6.3]
> at org.apache.avro.ipc.NettyTransceiver.<init>(NettyTransceiver.java:147) ~[avro-ipc-1.6.3.jar:1.6.3]
> at org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:106) ~[flume-ng-sdk-1.2.0.jar:1.2.0]
> ... 9 common frames omitted
> Caused by: java.net.ConnectException: Connection refused: no further information
> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.6.0_31]
> at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567) ~[na:1.6.0_31]
> at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$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]