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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-466) Startup scripts will not start instances of Hadoop daemons w/different configs w/o setting separate PID directories
Date Sat, 16 Jul 2011 16:39:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J resolved HADOOP-466.
----------------------------

       Resolution: Fixed
    Fix Version/s: 0.20.0

This problem indeed exists if one doesn't use the HADOOP_IDENT_STRING, but that's a valid
workaround than adding a dependency on md5sum and the like (or do we already use it?).

I think this may be resolved as fixed with the availability of HADOOP_IDENT_STRING to workaround
with.

Workaround (tested to work in 0.20.2):

{code}
# To start a second DN on same machine, with separated config.
HADOOP_IDENT_STRING=$USER-DN2 hadoop-daemon.sh --config /conf/dn2 start datanode
HADOOP_IDENT_STRING=$USER-DN2 hadoop-daemon.sh --config /conf/dn2 stop datanode
# These manage the PIDs as well, and will not complain that stuff is already running.
{code}

> Startup scripts will not start instances of Hadoop daemons w/different configs w/o setting
separate PID directories
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-466
>                 URL: https://issues.apache.org/jira/browse/HADOOP-466
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 0.5.0
>            Reporter: Vetle Roeim
>             Fix For: 0.20.0
>
>         Attachments: hadoop-466.diff
>
>
> Configuration directories can be specified by either setting HADOOP_CONF_DIR or using
the --config command line option. However, the hadoop-daemon.sh script will not start the
daemons unless the PID directory is separate for each configuration.
> The issue is that the code for generating PID filenames is not dependent on the configuration
directory. While the PID directory can be changed in hadoop-env.sh, it seems a little unnecessary
to have this restriction.

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