Hadoop on Local FileSystem
filesystems, hadoop, hdfs
Solution
You can remove the fs.default.name value from your mapred-site.xml file - this should only be in the core-site.xml file.
If you want to run on your local file system, in a pseudo mode, this is typically achieved by running in what's called local mode - by setting the fs.default.name value in core-site.xml to file:/// (you currently have it configured for hdfs://localhost:54310).
The stack trace you are seeing is when the secondary name node is starting up - this isn't needed when running in 'local mode' as there is no fsimage or edits file for the 2NN to work against.
Fix up your core-site.xml and mapred-site.xml. Stop all hadoop daemons and just start the map-reduce daemons (Job Tracker and Task Tracker).
Problem
I'm running Hadoop on a pseudo-distributed. I want to read and write from Local filesystem by Abstracting the HDFS for my job. Am using the `file:///` parameter. I followed this link. This is the file contents of `core-site.xml`, ``` <configuration> <property> <name>hadoop.tmp.dir</name> <value> /home/abimanyu/temp</value> </property> <property> <name>fs.default.name</name> <value>hdfs://localhost:54310</value> </property> </configuration> ``` This is the file contents of `mapred-site.xml`, ``` <configuration> <property> <name>mapred.job.tracker</name> <value>localhost:54311</value> </property> <property> <name>fs.default.name</name> <value>file:///</value> </property> <property> <name>mapred.tasktracker.map.tasks.maximum</name> <value>1</value> </property> <property> <name>mapred.tasktracker.reduce.tasks.maximum</name> <value>1</value> </property> </configuration> ``` This is the file contents of `hdfs-site.xml`, ``` <configuration> <property> <name>dfs.replication</name> <value>1</value> </property> </configuration> ``` This is the error I get when I try to start the demons(using start-dfs or start-all), ``` localhost: Exception in thread "main" java.lang.IllegalArgumentException: Does not contain a valid host:port authority: file:/// localhost: at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:164) localhost: at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:212) localhost: at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:244) localhost: at org.apache.hadoop.hdfs.server.namenode.NameNode.getServiceAddress(NameNode.java:236) localhost: at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.initialize(SecondaryNameNode.java:194) localhost: at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.<init>(SecondaryNameNode.java:150) localhost: at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main(SecondaryNameNode.java:676) ``` What is strange to me is that this reading from local file system works completely fine in `hadoop-0.20.2` but not in `hadoop-1.2.1`. Has anything changed from initial release to the later version ? Let me know how to read from Local File system for a Hadoop JAR.