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Subject: Is Pseudo-Distributed Operation only available from common 0.20?
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From: Thanh V Lam <thanhlam@us.ibm.com>
Date: Mon, 13 Sep 2010 17:10:40 -0400
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# hadoop -version
java version "1.6.0"
Java(TM) SE Runtime Environment (build pxi3260sr2-20080818_01(SR2))
IBM J9 VM (build 2.4, J2RE 1.6.0 IBM J9 2.4 Linux x86-32 
jvmxi3260-20080816_22093 (JIT enabled, AOT enabled)
J9VM - 20080816_022093_lHdSMr
JIT  - r9_20080721_1330ifx2
GC   - 20080724_AA)
JCL  - 20080808_02

When I had hadoop 0.19.1 on only one node, I though I would try out the 
Pseudo-Distributed Operation by running everything on one node.  The 
hadoop-site.xml contained namenode as localhost like following:
 
<configuration>
     <property>
         <name>fs.default.name</name>
         <value>hdfs://localhost:9000</value>
     </property>
</configuration>

Similarly for JobTracker:
 
<configuration>
     <property>
         <name>mapred.job.tracker</name>
         <value>localhost:9001</value>
     </property>
</configuration>

Starting the daemons would fail with the message "Not a host:port pair: 
local" in the log file:

2010-09-07 16:55:21,762 INFO org.apache.hadoop.mapred.JobTracker: 
STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting JobTracker
STARTUP_MSG:   host = rcc-pok-idg-1705/9.12.179.50
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 0.19.1
STARTUP_MSG:   build = 
https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.19 -r 
745977; compiled by 'ndaley' on Fri Feb 20 00:16:34 UTC 2009
************************************************************/
2010-09-07 16:55:21,949 FATAL org.apache.hadoop.mapred.JobTracker: 
java.lang.RuntimeException: Not a host:port pair: local
        at 
org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:134)
        at 
org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:121)
        at 
org.apache.hadoop.mapred.JobTracker.getAddress(JobTracker.java:1276)
        at 
org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:1084)
        at 
org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:143)
        at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:2790)

2010-09-07 16:55:21,950 INFO org.apache.hadoop.mapred.JobTracker: 
SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down JobTracker at rcc-pok-idg-1705/9.12.179.50
************************************************************/

Thanks!

-Thanh Lam.

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