RE: "could only be replicated to 0 nodes, instead of 1"

Hairong Kuang wrote:

Check http://namenode_host:50070/dfshealth.jsp to see if your cluster is
out of safemode or not and how many datanodes are up.

You could check .out/.log files under the log directory to see if there
is any error starting datanodes/namenode.

Hairong

-----Original Message-----
From: jerrro [mailto:jerrro@gmail.com]
Sent: Wednesday, December 05, 2007 9:29 AM
To: hadoop-user@lucene.apache.org
Subject: Re: "could only be replicated to 0 nodes, instead of 1"


I did this several times, while tuning the configuration in all kinds of
way... But still, nothing helped - Even when I stop everything, reformat
and start it back again, I get this error whenever trying to use dfs
-put.


Jason Venner-2 wrote:
>
> This happens to me, when the dfs has gotten into an inconsistent
state.
>
> NOTE: you will lose all of the contents of your HDS file system.
>
> What I hae to do, is stop dfs, remove the contents of the dfs
> directories on all the machines, hadoop namenode -format on the
> controller, then restart dfs.
> That consistently fixes the problem for me. This may be serious
> overkill but it works.
>
> NOTE: you will lose all of the contents of your HDS file system.
>
> jerrro wrote:
>> I am trying to install/configure hadoop on a cluster with several
>> computers.
>> I followed exactly the instructions in the hadoop website for
>> configuring multiple slaves, and when I run start-all.sh I get no
>> errors - both datanode and tasktracker are reported to be running
>> (doing ps awux | grep hadoop on the slave nodes returns two java
>> processes). Also, the log files are empty - nothing is printed there.

>> Still, when I try to use bin/hadoop dfs -put, I get the following
>> error:
>>
>> # bin/hadoop dfs -put w.txt w.txt
>> put: java.io.IOException: File /user/scohen/w4.txt could only be
>> replicated to 0 nodes, instead of 1
>>
>> and a file of size 0 is created on the DFS (bin/hadoop dfs -ls shows
it).
>>
>> I couldn't find much information about this error, but I did manage
>> to see somewhere it might mean that there are no datanodes running.
>> But as I said, start-all does not give any errors. Any ideas what
>> could be problem?
>>
>> Thanks.
>>
>> Jerr.
>>  
>
>

--
View this message in context:
http://www.nabble.com/%22could-only-be-replicated-to-0-nodes%2C-instead-
of-1%22-tf4950939.html#a14176525
Sent from the Hadoop Users mailing list archive at Nabble.com.