Unable to start CDH4 secondary name node: Invalid

I've been trying to setup a CDH4 installation of hadoop. I have 12 machines, labled hadoop01 - hadoop12, and the namenode, job tracker, and all data nodes have started fine. I'm able to view dfshealth.jsp and see that it's found all the data nodes.

However, whenever I try to start the secondary name node it gives an exception:

Starting Hadoop secondarynamenode:                         [  OK  ]
starting secondarynamenode, logging to /var/log/hadoop-hdfs/hadoop-hdfs-secondarynamenode-hadoop02.dev.terapeak.com.out
Exception in thread "main" java.lang.IllegalArgumentException: Invalid URI for NameNode address (check fs.defaultFS): file:/// has no authority.
        at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:324)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:312)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.getServiceAddress(NameNode.java:305)
        at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.initialize(SecondaryNameNode.java:222)
        at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.<init>(SecondaryNameNode.java:186)
        at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main(SecondaryNameNode.java:578)

This is my hdfs-site.xml file on the secondary name node:

<configuration>
  <property>
    <name>dfs.name.dir</name>
    <value>/data/1/dfs/nn</value>
  </property>
  <property>
    <name>dfs.namenode.http-address</name>
    <value>10.100.20.168:50070</value>
    <description>
      The address and the base port on which the dfs NameNode Web UI will listen.
      If the port is 0, the server will start on a free port.
    </description>
  </property>
  <property>
    <name>dfs.namenode.checkpoint.check.period</name>
    <value>3600</value>
  </property>
  <property>
    <name>dfs.namenode.checkpoint.txns</name>
    <value>40000</value>
  </property>
  <property>
    <name>dfs.namenode.checkpoint.dir</name>
    <value>/var/lib/hadoop-hdfs/cache</value>
  </property>
  <property>
    <name>dfs.namenode.checkpoint.edits.dir</name>
    <value>/var/lib/hadoop-hdfs/cache</value>
 </property>
 <property>
    <name>dfs.namenode.num.checkpoints.retained</name>
    <value>1</value>
  </property>
 <property>
    <name>mapreduce.jobtracker.restart.recover</name>
    <value>true</value>
  </property>

</configuration>

It would seem like something is wrong with the value given to dfs.namenode.http-address, but I'm not sure what. Should it start with http:// or hdfs://? I tried calling 10.100.20.168:50070 in lynx and it displayed a page. Any ideas?

回答1:

Looks like I was missing the core-site.xml configuration on the secondary name node. Added that and the process started properly.

core-site.xml:

<configuration>
 <property>
  <name>fs.defaultFS</name>
  <value>hdfs://10.100.20.168/</value>
 </property>
</configuration>

回答2:

If you are running a single node cluster, then make sure you have set the HADOOP_PREFIX variable correctly as indicated in the link: http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/SingleCluster.html

Even i faced the same issue as yours and it got rectified by setting this variable