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https://issues.apache.org/jira/browse/HADOOP-11668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14348344#comment-14348344
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Vinayakumar B commented on HADOOP-11668:
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Thanks [~aw].
{quote}
The problem was two fold:
We were not preserving quotes around parameters that contained $IFS due to lack
of quoting around the array deletion
The then deleted array elements were retained and show up as an empty argument.
{quote}
I don't think the problem is having empty arguments, I have verified in my
case, there were no empty arguments.
In my case
1. start-dfs.sh will call hadoop-daemons.sh as below
*hadoop-daemons.sh --config /home/vinay/install/conf --hostnames 'server3
server1' start namenode*
2. hadoop-daemons.sh passes these args to hdfscript as below
*hdfs --slaves --daemon start --config /home/vinay/install/conf --hostnames
server3 server1 namenode*
So the actual problem found is, in Original *HADOOP_USER_PARAMS* array,
*'server3 server1'* will be one element. But after this
{code}argv=(${HADOOP_USER_PARAMS[@]/start}){code} it becomes two separate
elements in {{argv}}. Even when original HADOOP_USER_PARAMS printed as
{code}${HADOOP_USER_PARAMS [@]}{code} it shows without quotes, which means
separate arguments to hdfsscript.
IMO, best way to solve this is by making hostnames delimited by (,)
Any thoughts?
> start-dfs.sh and stop-dfs.sh no longer works in HA mode after --slaves shell
> option
> -----------------------------------------------------------------------------------
>
> Key: HADOOP-11668
> URL: https://issues.apache.org/jira/browse/HADOOP-11668
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts
> Reporter: Vinayakumar B
> Assignee: Allen Wittenauer
> Attachments: HADOOP-11668-01.patch, HADOOP-11668-02.patch
>
>
> After introduction of "--slaves" option for the scripts, start-dfs.sh and
> stop-dfs.sh will no longer work in HA mode.
> This is due to multiple hostnames passed for '--hostnames' delimited with
> space.
> These hostnames are treated as commands and script fails.
> So, instead of delimiting with space, delimiting with comma(,) before passing
> to hadoop-daemons.sh will solve the problem.
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