+1 I've seen this same issue.
On Tue, Aug 26, 2014 at 12:33 PM, Andrew O'Neill <aone...@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 >
