Hi Steve, Thank you for sharing information of JIRA with me. Topology easy setting and confirmation will be necessary. I use JIRA for an idea about toplogy setting and confirmation.
Regards, Shinichi 2012/10/10 Ted Dunning <[email protected]> > > > On Tue, Oct 9, 2012 at 12:17 PM, Steve Loughran <[email protected]>wrote: > >> >> >> On 9 October 2012 16:51, Shinichi Yamashita <[email protected]> wrote: >> >>> Hi Steve, >>> >>> Thank you for your reply. >>> >>> >>> > no, it's the Namenode and JobTracker that needs to be restarted; >>> > they are the bits that care where the boxes are. >>> >>> I confirmed it in my cluster, and I understood it as follows. >>> First, the resolved node information is recorded in ConcurrentHashMap. >>> Next same node toplogy decision, HashMap data is given priority to over >>> a script. >>> The HashMap data become invalid by restart of NameNode and JobTracker. >>> >> >> That's right. There's been lots of discussion on adding live topology >> resetting. >> > > For what it's worth, there is at least one Hadoop derived distribution > which has live topology resetting already. > > I can follow up offline with anyone who wants more information. > >
