Thank you for all your assistance. Finally, After of a PE eviction, the value of the keyed attribute will be lost?
Best regards, Danilo P. 2014/1/15 Matthieu Morel <mmo...@apache.org> > > On Jan 15, 2014, at 00:34 , Danilo Pinto da Silva <danilob...@gmail.com> > wrote: > > > Thank you for your prompt reply. > > > > In general I am talking about Garbage Collection of PEs. > > Removing PE objects based on the available system memory and the impact > the > > object may have on the overall performance of the system. > > But I have some doubts, in terms of: > > > > How are PEs located? > > ( All PEs stay in a cache managed by LoadingCache object or in another > > place and only the most used are in the cache? ) > > PEs are held in a cache with a TTL. You may hook into that to persist them > by checkpointing upon eviction. > And you can replace the cache implementation and use something like a > multilevel cache, keeping hot PEs locally and others in memcached or > something like that. > > > > > How are PEs controled? > > ( Are they just defined in setPECache()? ) > > I don't get the question. > > > > > What relation about the simple garbage collection process (or others) and > > the java garbage collection? > > You can implement caches with weak/soft references. Eviction policy would > probably be different than with TTL-based caches. > > > > > And again, > > Does anybody tried to implement it? > > Is it a relevant feature for S4? > > Is it possible? > > It can be useful and certainly possible. I would say it depends on the use > case, and in particular, on the size of PEs, and the number of instances. > You should try to find the bottlenecks there (most optimizations in S4 have > been on serialization, parallelism and communication, not really on the > cache implementation). > > Have a look at the guava cache implementation for a start, you can find > some related presentations as well. > > Hope this helps, > > Matthieu > > > > > Best regards, > > Danilo P. > > > > > > > > > > 2014/1/14 kishore g <g.kish...@gmail.com> > > > >> Can you provide more info on the topic. Are you talking about Garbage > >> collection of PEs. There is simple garbage collection process that > expires > >> a PE after certain time of inactivity. > >> > >> thanks, > >> Kishore G > >> > >> > >> On Tue, Jan 14, 2014 at 9:26 AM, Danilo Pinto da Silva < > >> danilob...@gmail.com > >>> wrote: > >> > >>> Hello, > >>> > >>> I'm starting my masters research, and I some colleagues suggested me > >>> propose and implement a garbage collector for S4. > >>> Does anybody tried to implement it? Is it a relevant feature for S4? > >>> Any comments are welcome (even in private if you prefer). > >>> > >>> Best regards, > >>> Danilo P. > >>> > >> > >
