Isn't a TTL node and a session somewhat orthogonal issues? Can we create TTL nodes today within a session? Or would there need to be a thick client implementation that manages them by scheduled tasks that delete said node?
On Tue, Aug 30, 2016 at 10:23 AM, Flavio Junqueira <f...@apache.org> wrote: > As I understand TTL nodes, you want to have them when you don't want to > have sessions. I find it odd that you still need to create a session when > you choose to use TTL nodes to avoid sessions. It is correct that you can > create session/create TTL/close session in this order, but again, if you're > trying to avoid sessions, then it doesn't seem to be very appealing to use > TTL nodes this way. > > In any case, I need to go through the e-mail thread that Camille pointed > out. There is possibly some insight there that I'm missing. > > -Flavio > > > On 30 Aug 2016, at 14:21, Jordan Zimmerman <jor...@jordanzimmerman.com> > wrote: > > > > Yes, you need a session to create the TTL node. I believe discussion > about needing a session to create the node is beyond the scope of this > issue and should be addressed by a new Jira issue. It doesn’t affect the > utility of TTL nodes that you must first have a ZK session. Users who no > longer want a session can merely close the ZK handle after creating the TTL > node. > > > > -Jordan > > > >> On Aug 30, 2016, at 7:41 AM, Flavio Junqueira <f...@apache.org> wrote: > >> > >> > >>> On 29 Aug 2016, at 19:51, Jordan Zimmerman <jor...@jordanzimmerman.com> > wrote: > >>> > >>>> On the server side, we already have a mechanism to expire sessions, > do we a separate scheme to expire TTL nodes or can we use the same > mechanism? Does it make sense to consider a TTL node as a degenerate case > of a session in which I have a single ephemeral node? My recollection is > that it currently uses the container manager instead. > >>> > >>> The TTL implementation I did takes advantage of the Container node > feature. A TTL node is a variation of a container node. It doesn’t require > a session (like any persistent node). > >>> > >> > >> It doesn't require a session, but the client has no way to create such > a TTL node without creating a session first, right? You need the zk handle, > which has a session associated, to create a TTL node as I understand it. > >> > >> -Flavio > >> > > > > > >
