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From "Eric Payne (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7799) Improvements to Doc: Hadoop MapReduce Next Generation - Cluster Setup
Date Wed, 02 Nov 2011 21:55:32 GMT
Improvements to Doc: Hadoop MapReduce Next Generation - Cluster Setup
---------------------------------------------------------------------

                 Key: HADOOP-7799
                 URL: https://issues.apache.org/jira/browse/HADOOP-7799
             Project: Hadoop Common
          Issue Type: Bug
          Components: documentation
    Affects Versions: 0.23.0
            Reporter: Eric Payne
            Assignee: Arun C Murthy


- In section +Prerequisites+
-- Please add a link to download locaion of 0.23 release tar-ball.
- In section +Installation+
-- It would be good to have more details about where they should "untar" the image and what
the directory structure should look like. I can provide my notes on the detailed steps I took
to successfully install.
- In the section +Running Hadoop in Non-Secure Mode+
-- Can you add that templaces for the site and environment files can be found in {{./conf/}},
{{./share/hadoop/common/templates/conf/}}, and {{./share/hadoop/hdfs/templates/conf/}}
-- Also, it might be good to add a link to a sample configs that contain the bare minumum
to start a cluster.
-- The +conf/hdfs-site.xml+ section references the {{dfs.datanode.data.dir}} property. Should
we also include a reference to the {{dfs.datanode.data.dir.perm}} property as well?
-- The +Hadoop Rack Awareness+ section references {{topology.node.switch.mapping.impl}}, but
I think this is deprecated. I think the new one is {{net.topology.node.switch.mapping.impl}}.
Also, {{topology.script.file.name}} seems to be deprecated in favor of {{net.topology.script.file.name}}.
- In section +Operating the Hadoop Cluster+
-- The HDFS format command should have the {{-clusterid}} parameter:
--- {{$HADOOP_PREFIX_HOME/bin/hdfs namenode -format -clusterid <cluster_name>}}
-- The command to start the namenode is incorrect. It should either be:
1. {{$HADOOP_PREFIX_HOME/bin/hdfs --config $HADOOP_CONF_DIR  namenode &}} ## without the
{{start}}
or
2. {{$HADOOP_PREFIX/sbin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start namenode}}
I prefer the second, since you can also use that to stop the daemon.
-- The same for the command to start the datanode
-- The same for the command to start the resourcemanager, historyserver, and nodemanagers,
except that it should be {{yarn-daemon.sh}}
- Hadoop Shutdown:
-- If stopping the daemons is required, then {{hadoop-daemon.sh}} and {{yarn-daemon.sh}} should
be used to both start and stop.



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