Sergey, What prevents us from making MemoryPolicy expandable? For example, why not allocate another 1GB, when user runs out of memory? In my view, this would make our memory policies a lot more usable.
D. On Mon, Apr 17, 2017 at 2:42 AM, Sergey Chugunov <sergey.chugu...@gmail.com> wrote: > Hello Denis, > > There is a small piece of documentation in *MemoryConfiguration *class, > although I think it should be moved to *MemoryPolicyConfiguration *and > detailed a lot. > > I'm going to write some documentation soon about validation rules that are > applied to memory policies configuration (there are some restrictions about > reserved name, default memory policy name and so on). I'll let you know > when it is done. > > About your question: MemoryPolicy offheap regions were never supposed to be > expandable. If user uses default MemoryPolicy (which in fact doesn't have > any eviction algorithm configured) he/she will get OutOfMemory error when > default size is exhausted. > > This OOM behavior was left intentionally to be consistent with the previous > behavior as configuring some default eviction policy on default > MemoryPolicy may lead to data loss and it is better to communicate wrong > memory configuration to user even with OOM than silently drop some cached > values. > > Thanks, > Sergey. > > On Mon, Apr 17, 2017 at 12:01 AM, Denis Magda <dma...@apache.org> wrote: > > > Guys, > > > > I’ve been working on the documentation for page memory [1]. The doc is > > still in progress and it will be more profound with code snippets and > > pictures int the end, so don’t pay to the fact that it mostly consists of > > dry text only. > > > > So, the question is different. Presently, javadoc part is useless (and > > will be written by me as well) and it’s not clear what’s the default > > behavior of the page memory that has only one memory policy (default) > that > > instantiates a single memory region. Looking at the code I see that the > > default police creates 1 GB region that should be expandable because the > > policy doesn’t define an eviction algorithm. It means that if my app goes > > beyond 1 GB then the page memory will take more memory from an OS. Is my > > understanding correct? > > > > [1] https://apacheignite.readme.io/docs/page-memory < > > https://apacheignite.readme.io/docs/page-memory> > > > > — > > Denis >
