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From Denis Magda <dma...@gridgain.com>
Subject Re: Question: local cache on client nodes
Date Thu, 30 Mar 2017 12:00:51 GMT
It's abdolutely fine to have local caches on client nodes if an application
needs to cache data locally in hashtable like data structure and talk to it
using Ignite APIs.

The upshot is that this kind of cache can be started on any node and we
should keep supporting this capability in 2.0.


On Thursday, March 30, 2017, Sergey Chugunov <sergey.chugunov@gmail.com>

> Hello Igniters,
> Participating in big effort of reworking cache storage structures
> (IGNITE-3477 [1]) I came across a test that looks strange to me:
> *CacheStopAndDestroySelfTest::testLocalClose*.
> It is very simple: it starts two server nodes and one client node (with
> forceServerMode flag set to true), then creates local cache on one node,
> then adds some values to it on ALL nodes including client.
> It looks very confusing for me as I thought that client nodes aren't
> supposed to consume a lot of resources as they may be started on small
> machines, offheap PageMemory structures aren't allocated on clients at all.
> Which leads to test failure, obviously.
> Could you please clarify what the local cache is, how it is supposed to be
> used?
> Should it be started on client nodes as well as on server ones or it is
> something wrong with the test itself?
> [1] https://issues.apache.org/jira/browse/IGNITE-3477
> Thanks,
> Sergey Chugunov

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