Hi, This calculator provides the approximated results but I will try to explain:
1)Does it mean that I need to give or take 3GB of physical RAM on the host and set OFF-HEAP value to 3GB? Not fully correct. Yes, you should have 3GB of RAM for OFF-HEAP. But also you should provide some memory for Ignite application HEAP. The minimal requirement for a single node is 512 MB. It provides the possibility to start and works. Recommended configuration you can see here: https://apacheignite.readme.io/docs/jvm-and-system-tuning Also, your operating system and other application will use the memory. You should take it into account. 2)And give or take 5GB of physical disk space and set the data region 5GB? Correct in case if you will limit the WAL history. WAL history size could be unlimited in some configurations. It means that the size of it can't be calculated. You can set the limit: https://apacheignite.readme.io/docs/write-ahead-log#section-wal-archive 3)Now lets say I get 10 million and 1 objects would I get OOM? In case of persistence no. Some of the entries will be replaced by a new one in the memory but all of them will be stored on the disk. However, you can get "no disk space on device" error is there is no disk space. In case of disabled persistence the may see OOM in case if you didn't set the eviction policies: https://apacheignite.readme.io/docs/evictions BR, Andrei -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/
