Dmitriy, That’s about TTL and eviction support for Ignite persistence. Presently if you set an expiration or eviction policy for a cache it will be applied for data stored in memory. The policy never affects the persistence layer.
— Denis > On Nov 20, 2017, at 9:29 AM, Dmitry Pavlov <dpavlov....@gmail.com> wrote: > > Hi Denis, > > Is this need covered by PDS + TTL? > > For the very first TTL test, I found some delay after applying TTL with the > repository enabled: https://issues.apache.org/jira/browse/IGNITE-6964 > > And I'm wondering if the user's needs are covered by > https://apacheignite.readme.io/docs/expiry-policies plus > https://apacheignite.readme.io/docs/distributed-persistent-store > > Sincerely, > Dmitriy Pavlov > > сб, 18 нояб. 2017 г. в 12:12, Dmitry Pavlov <dpavlov....@gmail.com>: > >> Hi Denis, >> >> What is the difference of required by users functionality with TTL cache >> expiration? >> >> By some posts I can suppose TTL cache is compatible with native >> persistence. >> >> Sincerely, >> Dmitriy Pavlov >> >> сб, 18 нояб. 2017 г. в 0:41, Denis Magda <dma...@apache.org>: >> >>> Igniters, >>> >>> I’ve been talking to many Ignite users here and there who are already on >>> Ignite persistence or consider to turn it on. The majority of them are more >>> than satisfied with its current state and provided capabilities. That’s is >>> really good news for us. >>> >>> However, I tend to come across the people who ask about >>> eviction/expiration policies for the persistence itself. Had around 6 >>> conversation about the topic this month only. >>> >>> Usually the requirement is connected with a streaming use case. When an >>> application streams a lot of data (IoT, metrics, etc.) to the cluster but >>> the data becomes stale in some period of time (day, couple of days, etc.). >>> The user doesn’t want to waste the disk space and needs to simple purge the >>> data from there. >>> >>> My suggestion here is to create a timer task that will remove the stale >>> data from the cluster. However, since the demand is growing probably it’s a >>> good time to discuss a feasibility of this feature. >>> >>> Alex G, as the main architect of the persistence, could you share your >>> thoughts on this? What will it cost to us to support eviction/expiration >>> for the persistence? >>> >>> — >>> Denis >> >>
