FAQ
Hi,

Do we have to run multiple task trackers when running multiple data nodes on a single computer?

Regards,

Xiaobo Gu
-----Original Message-----
From: Xiaobo Gu
Sent: Friday, July 01, 2011 11:35 PM
To: hdfs-user@hadoop.apache.org
Subject: How to run multiple data nodes and multiple task trackers on single server.

Hi:
I am following the guides in
http://hadoop-karma.blogspot.com/2010/05/hadoop-cookbook-4-how-to-run-multiple.html
with Hadoop 0.20.203.0 on Solaris 10u9 X64, but I have revised the
hadoop-daemon.sh call to

hadoop-daemon.sh $1 datanode $DN_CONF_OPTS

But I failed with error messages as following:


-bash-3.00$ run-additionalDN.sh start 1
starting datanode, logging to
/data/hdp/additionalDN/1/logs/hadoop-gpadmin-datanode-solsvr2.out
Usage: java DataNode
[-rollback]

Regards,

Xiaobo Gu

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