>> Not sure how CQEngine will help for snapshotting of Ignite. Can you explain?
There was a discussion about this lib has various types of indexes that could be only created on read-only data. But it seems that indeed my note has a little value for this thread. On Thu, Oct 22, 2015 at 2:31 PM, Dmitriy Setrakyan <dsetrak...@apache.org> wrote: > Not sure how CQEngine will help for snapshotting of Ignite. Can you > explain? > > On Wed, Oct 21, 2015 at 7:48 PM, Alexey Kuznetsov <akuznet...@gridgain.com > > > wrote: > > > Some time ago we already discussed snapshots idea while discussing > library > > "cqengine" [1]. > > > > May be this library could be useful in snapshot mode. > > > > [1] Sources: https://github.com/npgall/cqengine > > Docs: https://code.google.com/p/cqengine/ > > > > On Thu, Oct 22, 2015 at 8:48 AM, Konstantin Boudnik <c...@apache.org> > > wrote: > > > > > On Wed, Oct 21, 2015 at 05:58PM, Dmitriy Setrakyan wrote: > > > > On Wed, Oct 21, 2015 at 4:48 PM, Konstantin Boudnik <c...@apache.org> > > > wrote: > > > > > > > > > I like it quite a bit, as well! Ticket would make the most sense as > > > well, > > > > > so > > > > > there will be a single place to collect the design docs (if > needed), > > > etc. > > > > > > > > > > On Wed, Oct 21, 2015 at 04:45PM, Dmitriy Setrakyan wrote: > > > > > > I also really like the idea. One potential use case is fraud > > > analysis in > > > > > > financial institutions. Rarely it makes sense to perform such > > > analysis > > > > > on a > > > > > > life system, but rather a snapshot of some data needs to be taken > > and > > > > > > analyzed offline. > > > > > > > > > > > > I think snapshots should be saved to disk, so users could load > them > > > for > > > > > > analysis on a totally different cluster. > > > > > > > > > > I think disk persistence should be optional, not mandatory. > > > > > > > > > > > > > I would actually prefer to support disk-only snapshots. I think it > will > > > be > > > > difficult (double-the-work) to support both, in-memory and disk > > formats. > > > > Also, storing snapshots in-memory would require extra memory (a lot > of > > > it) > > > > for something that gets saved mainly for historic purposes or offline > > > > analysis. > > > > > > Ah, good points! Agree. > > > > > > > > > > > > -- > > Alexey Kuznetsov > > GridGain Systems > > www.gridgain.com > > > -- Alexey Kuznetsov GridGain Systems www.gridgain.com
