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.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
