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From: "XiaoboGu" <guxiaobo1982@gmail.com>
To: <common-user@hadoop.apache.org>,
	<hdfs-user@hadoop.apache.org>,
	<mapred-user@hadoop.apache.org>
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Subject: RE: How to run multiple data nodes and multiple task trackers on
 single server.
Date: Sun, 3 Jul 2011 12:09:11 +0800
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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 [mailto:guxiaobo1982@gmail.com]
> 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.
>=20
> Hi:
>    I am following the guides in
> =
http://hadoop-karma.blogspot.com/2010/05/hadoop-cookbook-4-how-to-run-mul=
tiple.html
> with Hadoop 0.20.203.0 on Solaris 10u9 X64, but I have revised the
> hadoop-daemon.sh call to
>=20
> hadoop-daemon.sh  $1 datanode $DN_CONF_OPTS
>=20
> But I failed with error messages as following:
>=20
>=20
> -bash-3.00$ run-additionalDN.sh start 1
> starting datanode, logging to
> /data/hdp/additionalDN/1/logs/hadoop-gpadmin-datanode-solsvr2.out
> Usage: java DataNode
>            [-rollback]
>=20
> Regards,
>=20
> Xiaobo Gu