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HDFSsink failover error
Rahul Ravindran 2013-01-14, 21:42
Hi,
   I am attempting to setup an HDFS sink such that when a namenode failover occurs (active namenode is brought down and the standby namenode switches to active), the failover sink would send events to the new active namenode. I see an error about WRITE not supported in standby state..Does this not count as a failure for the failover sink?
Thanks,
~Rahul.

My config is as follows:

agent1.sinks.hdfs-sink1.channel = ch1
agent1.sinks.hdfs-sink1.type = hdfs
agent1.sinks.hdfs-sink1.hdfs.path = hdfs://ip-10-4-71-187.ec2.internal/user/br/shim/eventstream/event/host101/
agent1.sinks.hdfs-sink1.hdfs.filePrefix = event
agent1.sinks.hdfs-sink1.hdfs.writeFormat = Text
agent1.sinks.hdfs-sink1.hdfs.rollInterval = 120
agent1.sinks.hdfs-sink1.hdfs.rollCount = 0
agent1.sinks.hdfs-sink1.hdfs.rollSize = 0
agent1.sinks.hdfs-sink1.hdfs.fileType = DataStream
agent1.sinks.hdfs-sink1.hdfs.batchSize = 1000
agent1.sinks.hdfs-sink1.hdfs.txnEventSize = 1000

agent1.sinks.hdfs-sink1-back.channel = ch1
agent1.sinks.hdfs-sink1-back.type = hdfs
agent1.sinks.hdfs-sink1-back.hdfs.path = hdfs://ip-10-110-69-240.ec2.internal/user/br/shim/eventstream/event/host101/
agent1.sinks.hdfs-sink1-back.hdfs.filePrefix = event
agent1.sinks.hdfs-sink1-back.hdfs.writeFormat = Text
agent1.sinks.hdfs-sink1-back.hdfs.rollInterval = 120
agent1.sinks.hdfs-sink1-back.hdfs.rollCount = 0
agent1.sinks.hdfs-sink1-back.hdfs.rollSize = 0
agent1.sinks.hdfs-sink1-back.hdfs.fileType = DataStream
agent1.sinks.hdfs-sink1-back.hdfs.batchSize = 1000
agent1.sinks.hdfs-sink1-back.hdfs.txnEventSize = 1000

agent1.sinkgroups.failoverGroup1.sinks = hdfs-sink1 hdfs-sink1-back
agent1.sinkgroups.failoverGroup1.processor.type = failover
#higher number in priority is higher priority
agent1.sinkgroups.failoverGroup1.processor.priority.hdfs-sink1 = 10
agent1.sinkgroups.failoverGroup1.processor.priority.hdfs-sink1-back = 5
#failover if failure detected for 10 seconds
agent1.sinkgroups.failoverGroup1.processor.maxpenalty = 10000
agent1.sinkgroups = failoverGroup1
14 Jan 2013 21:37:28,819 INFO  [hdfs-hdfs-sink2-call-runner-6] (org.apache.flume.sink.hdfs.BucketWriter.doOpen:208)  - Creating hdfs://ip-10-4-71-187.ec2.internal/....
14 Jan 2013 21:37:28,834 WARN  [SinkRunner-PollingRunner-FailoverSinkProcessor] (org.apache.flume.sink.hdfs.HDFSEventSink.process:456)  - HDFS IO error
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category WRITE is not supported in state standby
        at org.apache.hadoop.hdfs.server.namenode.ha.StandbyState.checkOperation(StandbyState.java:87)
        at org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.checkOperation(NameNode.java:1379)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkOperation(FSNamesystem.java:762)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInt(FSNamesystem.java:1688)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1669)
        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.create(NameNodeRpcServer.java:409)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.create(ClientNamenodeProtocolServerSideTranslatorPB.java:205)
        at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:44068)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:453)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:898)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1693)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1689)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1332)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1687)

        at org.apache.hadoop.ipc.Client.call(Client.java:1160)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
        at $Proxy11.create(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMetho