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From Connor Woodson <cwoodson....@gmail.com>
Subject Re: HDFSsink failover error
Date Mon, 14 Jan 2013 23:05:50 GMT
So you are able to write normally to the back-up HDFS servers? And that
error you got was when you were trying to write to the normal server? Was
it supposed to be an error (it looks like it's due to how your Hadoop is
set up)?

The log lines you pasted make it look like there was a problem with your
hdfs-sink1 (like I said above, maybe your Hadoop cluster is set up wrong);
what should have happened is that the event was then written to the backup
server. Below the stack trace there should probably have been another WARN
statement saying "Sink hdfs-sink1 failed and has been sent to the failover
list". And if hdfs-sink1-back then was unable to write, you would see a
thrown EventDeliveryException in your log.

If there isn't anything else in the log, and the event wasn't written to
the backup server, then that would be a bug.

- Connor


On Mon, Jan 14, 2013 at 2:46 PM, Rahul Ravindran <rahulrv@yahoo.com> wrote:

> Here is the full config. I swapped the priorities on the sink processor
> after performing the namenode failiver and the writes were successful to
> the newly active namenode.
>
> agent1.channels.ch1.type = FILE
> agent1.channels.ch1.checkpointDir = /flume_runtime/checkpoint
> agent1.channels.ch1.dataDirs = /flume_runtime/data
>
>
> agent1.channels.ch2.type = FILE
> agent1.channels.ch2.checkpointDir = /flume_runtime/checkpoint2
> agent1.channels.ch2.dataDirs = /flume_runtime/data2
>
>
>
> # Define an Avro source called avro-source1 on agent1 and tell it
>
> # to bind to 0.0.0.0:41414. Connect it to channel ch1.
>
> agent1.sources.avro-source1.channels = ch1
> agent1.sources.avro-source1.type = avro
> agent1.sources.avro-source1.bind = 0.0.0.0
> agent1.sources.avro-source1.port = 4545
>
>
>
> agent1.sources.avro-source2.channels = ch2
> agent1.sources.avro-source2.type = avro
> agent1.sources.avro-source2.bind = 0.0.0.0
> agent1.sources.avro-source2.port = 4546
>
>
> 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-sink2.channel = ch2
> agent1.sinks.hdfs-sink2.type = hdfs
> agent1.sinks.hdfs-sink2.hdfs.path =
> hdfs://ip-10-4-71-187.ec2.internal/user/br/shim/eventstream/event/host102/
> agent1.sinks.hdfs-sink2.hdfs.filePrefix = event
> agent1.sinks.hdfs-sink2.hdfs.writeFormat = Text
> agent1.sinks.hdfs-sink2.hdfs.rollInterval = 120
> agent1.sinks.hdfs-sink2.hdfs.rollCount = 0
> agent1.sinks.hdfs-sink2.hdfs.rollSize = 0
> agent1.sinks.hdfs-sink2.hdfs.fileType = DataStream
> agent1.sinks.hdfs-sink2.hdfs.batchSize = 1000
> agent1.sinks.hdfs-sink2.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.sinks.hdfs-sink2-back.channel = ch2
> agent1.sinks.hdfs-sink2-back.type = hdfs
> agent1.sinks.hdfs-sink2-back.hdfs.path =
> hdfs://ip-10-110-69-240.ec2.internal/user/br/shim/eventstream/event/host102/
> agent1.sinks.hdfs-sink2-back.hdfs.filePrefix = event
> agent1.sinks.hdfs-sink2-back.hdfs.writeFormat = Text
> agent1.sinks.hdfs-sink2-back.hdfs.rollInterval = 120
> agent1.sinks.hdfs-sink2-back.hdfs.rollCount = 0
> agent1.sinks.hdfs-sink2-back.hdfs.rollSize = 0
> agent1.sinks.hdfs-sink2-back.hdfs.fileType = DataStream
> agent1.sinks.hdfs-sink2-back.hdfs.batchSize = 1000
> agent1.sinks.hdfs-sink2-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.failoverGroup2.sinks = hdfs-sink2 hdfs-sink2-back
> agent1.sinkgroups.failoverGroup2.processor.type = failover
> #higher number in priority is higher priority
> agent1.sinkgroups.failoverGroup2.processor.priority.hdfs-sink2 = 10
> agent1.sinkgroups.failoverGroup2.processor.priority.hdfs-sink2-back = 5
> #failover if failure detected for 10 seconds
> agent1.sinkgroups.failoverGroup2.processor.maxpenalty = 10000
>
> # Finally, now that we've defined all of our components, tell
> # agent1 which ones we want to activate.
> agent1.sinkgroups = failoverGroup1 failoverGroup2
> agent1.channels = ch1 ch2
> agent1.sources = avro-source1 avro-source2
> agent1.sinks = hdfs-sink1 hdfs-sink2 hdfs-sink1-back hdfs-sink2-back
>
>   ------------------------------
> *From:* Connor Woodson <cwoodson.dev@gmail.com>
> *To:* user@flume.apache.org; Rahul Ravindran <rahulrv@yahoo.com>
> *Sent:* Monday, January 14, 2013 2:28 PM
> *Subject:* Re: HDFSsink failover error
>
> I assume that's only part of your config as it's missing a source; if you
> get rid of the sink processor, can you write to each hdfs sink
> individually? (comment one out at a time)
>
> - Connor
>
>
> On Mon, Jan 14, 2013 at 1:42 PM, Rahul Ravindran <rahulrv@yahoo.com>wrote:
>
> 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
>
>
>
>
>

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