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From aealexsandrov <aealexsand...@gmail.com>
Subject Re: Is it safe to decrease the data region size for a live cluster
Date Mon, 24 Dec 2018 13:08:36 GMT
Hi,

Yes, it's safe in case if rest (256-132) GB of RAM is enough for your system
working and other applications.

You have persistence, so your data will not be missed. Data region size sets
for every node and can be changed during node restart.

However, you should take an account to the next things:

1)In case if you are going to have the high availability of your data then
you could face a data loss issue during one of the nodes will be offline. To
avoid it you should add at least 1 backup for your caches or use the
replicated caches.

2)You should accurate calculate your memory usage to avoid the OOM issue
before increasing of the data region size. But it should be important when
you are going to increase it.

The best practice here is set the size of the data region to some value that
provides the possibility to store all persisted data in RAM. In this case,
you will see the best performance. When the data region size is small then
you will more often read from the disk and your performance will be lower.

BR,
Andrei



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