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From Gary Malouf <malouf.g...@gmail.com>
Subject Re: Flume 1.4 HDFS Sink Cannot Reconnect
Date Tue, 26 Aug 2014 16:44:34 GMT
+1 I've seen this same issue.


On Tue, Aug 26, 2014 at 12:33 PM, Andrew O'Neill <aoneill@paytronix.com>
wrote:

> Hello all,
>
> My setup:
>     - Flume 1.4
>     - CDH 4.2.2 (2.0.0-cdh4.2.2)
>
>
> I am testing a simple flume setup with a Sequence Generator Source, a File
> Channel, and an HDFS Sink (see my flume.conf below). This configuration
> works as expected until I reboot the cluster’s NameNode or until I restart
> the HDFS service on the cluster. At this point, it appears that the Flume
> Agent cannot reconnect to HDFS and must be manually restarted. Since this
> is not an uncommon occurrence  in our production cluster, it is important
> that Flume is able to reconnect gracefully without any manual intervention.
>
> So, how do we fix this HDFS reconnection issue?
>
>
> Here is our flume.conf:
>
>     appserver.sources = rawtext
>     appserver.channels = testchannel
>     appserver.sinks = test_sink
>
>     appserver.sources.rawtext.type = seq
>     appserver.sources.rawtext.channels = testchannel
>
>     appserver.channels.testchannel.type = file
>     appserver.channels.testchannel.capacity = 10000000
>     appserver.channels.testchannel.minimumRequiredSpace = 214748364800
>     appserver.channels.testchannel.checkpointDir =
> /Users/aoneill/Desktop/testchannel/checkpoint
>     appserver.channels.testchannel.dataDirs =
> /Users/aoneill/Desktop/testchannel/data
>     appserver.channels.testchannel.maxFileSize = 20000000
>
>     appserver.sinks.test_sink.type = hdfs
>     appserver.sinks.test_sink.channel = testchannel
>     appserver.sinks.test_sink.hdfs.path =
> hdfs://cluster01:8020/user/aoneill/flumetest
>     appserver.sinks.test_sink.hdfs.closeTries = 3
>     appserver.sinks.test_sink.hdfs.filePrefix = events-
>     appserver.sinks.test_sink.hdfs.fileSuffix = .avro
>     appserver.sinks.test_sink.hdfs.fileType = DataStream
>     appserver.sinks.test_sink.hdfs.writeFormat = Text
>     appserver.sinks.test_sink.hdfs.inUsePrefix = inuse-
>     appserver.sinks.test_sink.hdfs.inUseSuffix = .avro
>     appserver.sinks.test_sink.hdfs.rollCount = 100000
>     appserver.sinks.test_sink.hdfs.rollInterval = 30
>     appserver.sinks.test_sink.hdfs.rollSize = 10485760
>
>
> These are the two error message that the Flume Agent outputs constantly
> after the restart:
>
>     2014-08-26 10:47:24,572
> (SinkRunner-PollingRunner-DefaultSinkProcessor) [ERROR -
> org.apache.flume.sink.hdfs.AbstractHDFSWriter.isUnderReplicated(AbstractHDFSWriter.java:96)]
> Unexpected error while checking replication factor
>     java.lang.reflect.InvocationTargetException
>         at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at
> org.apache.flume.sink.hdfs.AbstractHDFSWriter.getNumCurrentReplicas(AbstractHDFSWriter.java:162)
>         at
> org.apache.flume.sink.hdfs.AbstractHDFSWriter.isUnderReplicated(AbstractHDFSWriter.java:82)
>         at
> org.apache.flume.sink.hdfs.BucketWriter.shouldRotate(BucketWriter.java:452)
>         at
> org.apache.flume.sink.hdfs.BucketWriter.append(BucketWriter.java:387)
>         at
> org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:392)
>         at
> org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:68)
>         at
> org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:147)
>         at java.lang.Thread.run(Thread.java:744)
>     Caused by: java.net.ConnectException: Connection refused
>         at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>         at
> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:735)
>         at
> org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:207)
>         at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:525)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream.createSocketForPipeline(DFSOutputStream.java:1253)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.transfer(DFSOutputStream.java:891)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:881)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:982)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:779)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:448)
>
> and
>
>     2014-08-26 10:47:29,592
> (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN -
> org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:418)]
> HDFS IO error
>     java.net.ConnectException: Connection refused
>         at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>         at
> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:735)
>         at
> org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:207)
>         at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:525)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream.createSocketForPipeline(DFSOutputStream.java:1253)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.transfer(DFSOutputStream.java:891)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:881)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:982)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:779)
>         at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:448)
>
>
> I can provide additional information if needed. Thank you very much for
> any insight you are able to provide into this problem.
>
>
> Best,
>
> Andrew
>

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