[ http://issues.apache.org/jira/browse/HADOOP-56?page=comments#action_12368011 ]
Konstantin Shvachko commented on HADOOP-56: ------------------------------------------- Format is definitely useful. But I don't think it is reasonable to add GUID or any user information anywhere except file description on the namenode. Otherwise it will be hard to support this information. - The problem of different DFS installs writing to the same drive can be solved by introducing DFS cluster name, and including it as a final component of dfs.name.dir and dfs.data.dir - DFS probably needs an application version number, which should be compared when the file system starts uploading information from the check pointed image. And the conversion method, which if specified would provide conversion between the versions, and if not the system should refuse loading the image. Sooner or later conversion of data will become an issue, it would be good to have the mechanism in place by that time. > hadoop nameserver does not recognise ndfs nameserver image > ---------------------------------------------------------- > > Key: HADOOP-56 > URL: http://issues.apache.org/jira/browse/HADOOP-56 > Project: Hadoop > Type: Bug > Components: dfs > Versions: 0.1 > Reporter: Yoram Arnon > Priority: Critical > Attachments: ndfs.tar.gz > > hadoop nameserver does not recognise ndfs image > Thus, upgrading from ndfs to hadoop dfs results in total data loss. > The upgrade should be seemless, with the new server recognising all previous > version that are not end-of-life'd. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
