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From "Chandra Mohan, Ananda Vel Murugan" <Ananda.Muru...@honeywell.com>
Subject RE: datanode startup before hostname is resovable
Date Wed, 08 Aug 2012 07:18:55 GMT
I had a similar problem under different circumstances. I added the hostname and ip in /etc/hosts

From: Alan Miller [mailto:Alan.Miller@synopsys.com]
Sent: Wednesday, August 08, 2012 12:32 PM
To: user@hadoop.apache.org
Subject: datanode startup before hostname is resovable

For development I run CDH4 on my local machine  but I notice that I have to
manually start the datanode (sudo service hadoop-hdfs-datanode start)
after each reboot.

Looks like the datanode process is getting started before my DHCP address Is resolvable.
From:  /var/log/hadoop-hdfs/hadoop-hdfs-datanode-myhost.log

    2012-08-08 08:44:01,171 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
    STARTUP_MSG: Starting DataNode
    STARTUP_MSG:   host = java.net.UnknownHostException: myhostname: myhostname
    2012-08-08 08:44:02,253 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: Exception
in secureMain java.net.UnknownHostException: myhostname: myhostname
    SHUTDOWN_MSG: Shutting down DataNode at java.net.UnknownHostException: myhostname: myhostname

I'm on Fedora 16/x86_64.


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