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From Arun C Murthy <...@hortonworks.com>
Subject Re: Hadoop 2.2.0 from source configuration
Date Mon, 02 Dec 2013 23:32:12 GMT
Daniel,

 Apologies if you had a bad experience. If you can point them out to us, we'd be more than
happy to fix it - alternately, we'd *love* it if you could help us improve docs too.

 Now, for the problem at hand: http://wiki.apache.org/hadoop/CouldOnlyBeReplicatedTo is one
place to look. Basically NN cannot find any datanodes. Anything in your NN logs to indicate
trouble?

 Also, pls feel free to open liras with issues you find and we'll help.

thanks,
Arun

On Dec 2, 2013, at 8:44 AM, Daniel Savard <daniel.savard@gmail.com> wrote:

> André,
> 
> good for you that greedy instructions on the reference page were enough to setup your
cluster. However, read them again and see how many assumptions are made into them about what
you are supposed to already know and should come without saying more about it.
> 
> I did try the single node setup, it is worst than the cluster setup regarding the instructions.
You are supposed to already have a near working system as far as I understand the instructions.
It is assumed the HDFS is already setup and working properly. Try to find the instructions
to setup HDFS for version 2.2.0 and you will end up with a lot of inappropriate instructions
about previous version (some properties were renamed).
> 
> It may appear hard at people to say this is toxic, but it is. The first place a newcomer
will go is setup a single node. This will be his starting point and he will be left with a
bunch of a priori and no clue.
> 
> To go back to my very problem at this point: 
> 
> 13/12/02 11:34:07 WARN hdfs.DFSClient: DataStreamer Exception
> org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /test._COPYING_ could
only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running
and no node(s) are excluded in this operation.
>     at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget(BlockManager.java:1384)
>     at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2477)
>     at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:555)
>     at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:387)
>     at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:59582)
>     at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
>     at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)
>     at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2048)
>     at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2044)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at javax.security.auth.Subject.doAs(Subject.java:415)
>     at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
>     at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2042)
> 
>     at org.apache.hadoop.ipc.Client.call(Client.java:1347)
>     at org.apache.hadoop.ipc.Client.call(Client.java:1300)
>     at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
>     at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>     at java.lang.reflect.Method.invoke(Method.java:606)
>     at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)
>     at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
>     at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
>     at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:330)
>     at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1226)
>     at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1078)
>     at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
> 
> I can copy an empty file, but as soon as its content is non-zero I am getting this message.
Searching on the message is of no help so far.
> 
> And I skimmed through the cluster instructions and found nothing there that could help
in any way neither.
> 
> 
> -----------------
> Daniel Savard
> 
> 
> 2013/12/2 Andre Kelpe <akelpe@concurrentinc.com>
> Hi Daniel,
> 
> first of all, before posting to a mailing list, take a deep breath and
> let your frustrations out. Then write the email. Using words like
> "crappy", "toxicware", "nightmare" are not going to help you getting
> useful responses.
> 
> While I agree that the docs can be confusing, we should try to stay
> constructive. You haven't  mentioned which documentation you are
> using. I found the cluster tutorial sufficient to get me started:
> http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/ClusterSetup.html
> 
> If you are looking for an easy way to spin up a small cluster with
> hadoop 2.2, try the hadoop2 branch of this vagrant setup:
> 
> https://github.com/fs111/vagrant-hadoop-cluster/tree/hadoop2
> 
> - André
> 
> On Mon, Dec 2, 2013 at 5:34 AM, Daniel Savard <daniel.savard@gmail.com> wrote:
> > I am trying to configure hadoop 2.2.0 from source code and I found the
> > instructions really crappy and incomplete. It is like they were written to
> > avoid someone can do the job himself and must contract someone else to do it
> > or buy a packaged version.
> >
> > It is about three days I am struggling with this stuff with partial success.
> > The documentation is less than clear and most of the stuff out there apply
> > to earlier version and they haven't been updated for version 2.2.0.
> >
> > I was able to setup HDFS, however I am still unable to use it. I am doing a
> > single node installation and the instruction page doesn't explain anything
> > beside telling you to do this and that without documenting what each thing
> > is doing and what choices are available and what guidelines you should
> > follow. There is even environment variables you are told to set, but nothing
> > is said about what they mean and to which value they should be set. It seems
> > it assumes prior knowledge of everything about hadoop.
> >
> > Anyone knows a site with proper documentation about hadoop or it's hopeless
> > and this whole thing is just a piece of toxicware?
> >
> > I am already looking for alternate solutions to hadoop which for sure will
> > be a nightmare to manage and install each time a new version, release will
> > become available.
> >
> > TIA
> > -----------------
> > Daniel Savard
> 
> 
> 
> --
> André Kelpe
> andre@concurrentinc.com
> http://concurrentinc.com
> 

--
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/



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