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Date: Mon, 30 Aug 2010 10:49:50 +0800 (CST)
From: Gang Luo <lgpublic@yahoo.com.cn>
Subject: cluster startup problem
To: common-user@hadoop.apache.org
In-Reply-To: <4C7AEF9D.7020702@gmail.com>
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Hi all,=0AI am trying to configure and start a hadoop cluster on EC2. I got=
 some problems =0Ahere. =0A=0A=0A1. Can I share hadoop code and its configu=
ration across nodes? Say I have a =0Adistributed file system running in the=
 cluster and all the nodes could see the =0Ahadoop code and conf there. So =
all the nodes will use the same copy of code and =0Aconf to run. Is it poss=
ible?=0A=0A2. if all the nodes could share hadoop and conf, does it mean I =
can launch =0Ahadoop (bin/start-dfs.sh, bin/start-mapred.sh) from any node =
(even slave node)?=0A=0A3. I think I specify and master and slave correctly=
. When I launch hadoop from =0Amaster node, no tasktracker or datanode was =
launched on slave nodes. The log on =0Aslave nodes says: =0A=0AERROR org.ap=
ache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: =0AIncompat=
ible namespaceIDs in /mnt/hadoop/dfs/data: namenode namespaceID =3D =0A1048=
149291; datanode namespaceID =3D 313740560=0A=0Awhat is the problem?=0A=0AT=
hanks,=0A-Gang=0A=0A=0A=0A