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https://issues.apache.org/jira/browse/WHIRR-342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067154#comment-13067154
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Andrei Savu commented on WHIRR-342:
-----------------------------------
We should start by at least documenting this behavior until we have a patch.
> hadoop/hbase configuration & active roles on a node
> ---------------------------------------------------
>
> Key: WHIRR-342
> URL: https://issues.apache.org/jira/browse/WHIRR-342
> Project: Whirr
> Issue Type: Improvement
> Components: service/hadoop, service/hbase
> Reporter: Bruno Dumon
>
> The following limitations exist with the generation of
> hadoop-(core|hdfs|mapred).xml and hbase-site.xml (assuming WHIRR-339 applied):
> * they are not generated by all roles (e.g. tasktracker, thrift server,
> ...), by consequence running these roles by themselves on a node
> unaccompagnied of a role that does generate them will not work.
> * running two roles on the same node that generate the same files does not
> work as it should, as the generated contents gets appended twice to the same
> file, causing non-well-formed XML. This is because of the usage of jcloud's
> Statements.appendFile.
> The cheapest solution would be to replace Statements.appendFile with
> something similar but without the 'append' behavior, thus rather a
> 'Statements.overwriteFile' (not available in jclouds afaics).
> This of course assumes that when different roles are writing the same files,
> that they put the same contents in them, so that the overwriting does not
> matter.
> Alternatively, things could be made smarter so that the same configuration is
> only generated once for all roles.
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