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From "Tom White" <tom.e.wh...@gmail.com>
Subject Re: hadoop ec2 tutorial, cluster has no datanodes
Date Wed, 17 Oct 2007 21:04:00 GMT
How many instances are you running (what did you set NO_INSTANCES to)?
Can you connect to the other instances (look in the slaves file for
their addresses) and verify that datanodes are indeed running?

Tom

On 17/10/2007, Tiger Uppercut <get2thachopper@gmail.com> wrote:
> Hi,
>
> I'm using the Hadoop 0.14.1 AMI as my master node [ami-64f6130d], and
> I've followed up to "test your cluster" bit of the tutorial listed
> here:
>
>     http://wiki.apache.org/lucene-hadoop/AmazonEC2
>
> However, when I try to run the following command,
>
>     $ bin/hadoop jar hadoop-*-examples.jar pi 10 10000000
>
> I get an error "Failed to create file /user/root/test-mini-mr/in/part0
> on client 127.0.0.1 because this cluster has no datanodes."
>
> Specifically:
>
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: Failed to
> create file /user/root/test-mini-mr/in/part0 on client 127.0.0.1
> because this cluster has no datanodes.
>         at org.apache.hadoop.dfs.FSNamesystem.startFile(FSNamesystem.java:739)
>
> According to the following thread [
> http://mail-archives.apache.org/mod_mbox/lucene-hadoop-user/200706.mbox/%3C466DA5DB.9070808@yahoo-inc.com%3E
> ], I need to check my ip-addresses.
>
> My dynDNS settings are as follows.
>
> hostname: something.webhop.org
> wildcard: true
> service type: host with IP address
> ip address: xx.yy.zz.aa
> webhop: http://ec2-xx-yy-zz-aa.z-1.compute-1.amazonaws.com/
>
>
>
> For reference, my hadoop-site.xml file is:
>
> <configuration>
>
> <property>
>   <name>hadoop.tmp.dir</name>
>   <value>/mnt/hadoop</value>
> </property>
>
> <property>
>   <name>fs.default.name</name>
>   <value>localhost:50001</value>
> </property>
>
> <property>
>   <name>mapred.job.tracker</name>
>   <value>localhost:50002</value>
> </property>
>
> </configuration>
>
>
>
> Any tips would be very welcome...!
>
> Thanks!
>
> [I've also posted this to Amazon's EC2 forum.]
>

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