Is it okay to have multiple ES nodes on one machine?

Is it okay to have multiple ES nodes on one machine? what are the cons to this action?

Yes, sometimes that makes sense. They obviously contend for the same limited resources (disk, CPU etc) and there's a bit of per-node overhead too.

So I should manage Memory to overall nodes usage become equal to half of all memory?

Yes, decide how much of your total memory you want to allocate to each node, then set the heap size on each node to no more than half of its allocation.

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