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Subject: Datanode not allowed to connect to the Namenode in Hadoop 2.3.0
 cluster.
From: "S.L" <simpleliving016@gmail.com>
To: user@hadoop.apache.org
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--047d7bfe9e2cf3bc5604ffc0b593
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Hi All,

I am trying to set up a Apache Hadoop 2.3.0 cluster , I have a master and
three slave nodes , the slave nodes are listed in the
$HADOOP_HOME/etc/hadoop/slaves file and I can telnet from the slaves to the
Master Name node on port 9000, however when I start the datanode on any of
the slaves I get the following exception .

2014-08-03 08:04:27,952 FATAL
org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for
block pool Block pool BP-1086620743-170.75.152.162-1407064313305 (Datanode
Uuid null) service to server1.dealyaft.com/170.75.152.162:9000
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
Datanode denied communication with namenode because hostname cannot be
resolved .

The following are the contents of my core-site.xml.

<configuration>
    <property>
        <name>fs.default.name</name>
        <value>hdfs://server1.mydomain.com:9000</value>
    </property>
</configuration>

Also in my hdfs-site.xml  I am not setting any value for dfs.hosts or
dfs.hosts.exclude properties.

Thanks.

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div><div>Hi All,<br><br>I am trying to set up a Apac=
he Hadoop 2.3.0 cluster , I have a master and three slave nodes , the slave=
 nodes are listed in the $HADOOP_HOME/etc/hadoop/slaves file and I can teln=
et from the slaves to the Master Name node on port 9000, however when I sta=
rt the datanode on any of the slaves I get the following exception .<br>
<br>2014-08-03 08:04:27,952 FATAL org.apache.hadoop.hdfs.server.datanode.Da=
taNode: Initialization failed for block pool Block pool BP-1086620743-170.7=
5.152.162-1407064313305 (Datanode Uuid null) service to <a href=3D"http://s=
erver1.dealyaft.com/170.75.152.162:9000">server1.dealyaft.com/170.75.152.16=
2:9000</a><br>
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protoco=
l.DisallowedDatanodeException): Datanode denied communication with namenode=
 because hostname cannot be resolved .<br><br></div>The following are the c=
ontents of my core-site.xml.<br>
<br>&lt;configuration&gt;<br>=C2=A0=C2=A0=C2=A0 &lt;property&gt;<br>=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;name&gt;<a href=3D"http://fs.defau=
lt.name">fs.default.name</a>&lt;/name&gt;<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;value&gt;hdfs://<a href=3D"http://server1.mydomain.com:900=
0">server1.mydomain.com:9000</a>&lt;/value&gt;<br>
=C2=A0=C2=A0=C2=A0 &lt;/property&gt;<br>&lt;/configuration&gt;<br><br></div=
>Also in my hdfs-site.xml=C2=A0 I am not setting any value for dfs.hosts or=
 dfs.hosts.exclude properties.<br><br></div>Thanks.<br></div>

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