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From "Arpit Gupta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8767) secondary namenode on slave machines
Date Wed, 05 Sep 2012 18:13:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13448958#comment-13448958
] 

Arpit Gupta commented on HADOOP-8767:
-------------------------------------

Patch does not seem to be correctly formatted. For details on take a look at http://wiki.apache.org/hadoop/HowToContribute
or if you use git then http://wiki.apache.org/hadoop/GitAndHadoop


A few comments on your patch.

Rather than assigning HOSTLIST after hadoop-env.sh is sourced we should do the following

1. in hadoop-config.sh source the hadoop-env.sh before additional parameters are processed
such as --hosts. This way if you specify the hosts at command line they will get set appropriately.
This will help as in start-dfs.sh the secondary namenode is being started as

{code}
"$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters start secondarynamenode
{code}


2. in slaves.sh remove the source of hadoop-env.sh as it has already been sourced by hadoop-config.sh.
Thus the assignment of HADOOP_SLAVES done by hadoop-config.sh will be available rather than
being overwritten by hadoop-env.sh

                
> secondary namenode on slave machines
> ------------------------------------
>
>                 Key: HADOOP-8767
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8767
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: bin
>    Affects Versions: 1.0.3
>            Reporter: giovanni delussu
>            Priority: Minor
>             Fix For: 1.0.3
>
>         Attachments: patch_hadoop-config.sh_hadoop-1.0.3_fromtar.patch, patch_slaves.sh_hadoop-1.0.3_fromtar.patch
>
>
> when the default value for HADOOP_SLAVES is changed in hadoop-env.sh the hdfs starting
(with start-dfs.sh) creates secondary namenodes on all the machines in the file conf/slaves
instead of conf/masters.

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