Andrew O'Neill created FLUME-2451:
-------------------------------------
Summary: HDFS Sink Cannot Reconnect After NameNode Restart
Key: FLUME-2451
URL: https://issues.apache.org/jira/browse/FLUME-2451
Project: Flume
Issue Type: Bug
Components: File Channel, Sinks+Sources
Affects Versions: v1.4.0
Environment: 8 node CDH 4.2.2 (2.0.0-cdh4.2.2) cluster
All cluster machines are running Ubuntu 12.04 x86_64
Reporter: Andrew O'Neill
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.
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.
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