It seems to me that the fact that the namespace format needs to be changed is the specific, immediate problem, but the bigger problem is that there isn't a mechanism to perform an atomic reconfiguration step for log metadata. Namespace format change is one example of a reconfiguration (if we start viewing namespace format as a part of log metadata, which just happens to currently be unspecified since there is no format other than the flat one), but there are already other metadata reconfiguration changes that are desired: https://issues.apache.org/jira/browse/DL-74 and https://issues.apache.org/jira/browse/DL-77. I think we should try to solve the general reconfiguration problem correctly first, and then that should enable us to solve both this problem and those two more naturally. I expect that a correct reconfiguration solution would obviate the need for this sub-task: https://issues.apache.org/jira/browse/DL-201.
On Tue, Apr 18, 2017 at 1:06 PM, Leigh Stewart <lstew...@twitter.com> wrote: > + Dan > > On Tue, Apr 18, 2017 at 1:04 PM, Sijie Guo <guosi...@gmail.com> wrote: > >> Hi all, >> >> I created a proposal for supporting symlinks in Dlog, in order to migrate >> a namespace from flat namespace to a hierarchical namespace. >> >> https://cwiki.apache.org/confluence/display/DL/DP-8+-+Symlinked+Log >> >> Please take a look and let me know your thoughts. >> >> - Sijie >> >> >
