As Jordan described, he has implemented it in Curator. I haven't had a look at the implementation, but perhaps he can point you to code and doc.
-Flavio > On 30 Aug 2016, at 18:29, Irfan Hamid <[email protected]> wrote: > > 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 <[email protected]> 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 <[email protected]> >> 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 <[email protected]> wrote: >>>> >>>> >>>>> On 29 Aug 2016, at 19:51, Jordan Zimmerman <[email protected]> >> 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 >>>> >>> >>> >> >>
