Folks, I created 2 Jira issue for new metrics. Also, I think they will be useful. Let's discuss in comments.
- Add new metrics for data storage IGNITE-8078 <https://issues.apache.org/jira/browse/IGNITE-8078> - Implement new JMX metrics for transactions IGNITE-8077 <https://issues.apache.org/jira/browse/IGNITE-8077> On Thu, Mar 29, 2018 at 8:26 PM, Denis Magda <dma...@apache.org> wrote: > Alexey, > > If to rephrase it differently, if a cache/table belongs to a single cache > group then its entries will never be mixed with the entries of another > caches/tables in both data and index pages. Please confirm that my > statement is correct. Also, does that counter accumulates size of > BinaryObjects or the whole data/index pages? > > Finally, do you plan to rework CacheMetrics.getOffHeapAllocatedSize method > for this purpose? (btw, to my knowledge the method is broken at the moment > and returns 0). > > -- > Denis > > > On Thu, Mar 29, 2018 at 1:20 AM, Alexey Goncharuk < > alexey.goncha...@gmail.com> wrote: > > > Denis, > > > > Currently there is an easy way to add per-cache-group metrics for data > and > > index pages. There is an internal counter, but it is not published as an > > MBean metric, we will do this as a part of IEP-6. > > > > As for the per-cache metrics, this can be implemented, but it will take a > > significantly greater effort and most likely will affect performance. As > > Andrey noted, when two caches share the same cache group, multiple > entries > > may be written to the same page, this needs special handling. I suggest > we > > first start with per-cache-group metrics and then, if there is high > demand, > > start thinking about per-cache metrics. > > > > --AG > > > > 2018-03-27 15:18 GMT+03:00 Andrey Kuznetsov <stku...@gmail.com>: > > > > > I apologize for the previous message sent in hurry. It's imposible to > > > measure the difference between 'precise' and 'estimated' page memory > > usage > > > per cache unless we fully implement approach 2. Current model allows to > > > store objects from several caches in a single page. > > > > > > 2018-03-23 22:21 GMT+03:00 Andrey Kuznetsov <stku...@gmail.com>: > > > > > > > Denis, > > > > > > > > I'll need to conduct some experiments to estimate the difference. And > > the > > > > answer will depend on numerous parameters: object sizes, number of > > > caches, > > > > that share the same data region and so on. > > > > > > > > пт, 23 марта 2018, 21:53 Denis Magda <dma...@apache.org>: > > > > > > > >> Andrey, > > > >> > > > >> How good will be the estimate if we go for 1. and utilize > > > pagesFillFactor > > > >> somehow? In other words, how big can be a difference between 100% > > > precise > > > >> calculation you the approach you're suggesting? > > > >> > > > >> -- > > > >> Denis > > > >> > > > >> > > > > > > > > > -- > > > Best regards, > > > Andrey Kuznetsov. > > > > > >
