Suppose we have 5 entities: A,B,C,D,E with the following ancestor hierarchy:
A
/ \
B C
/ \
D E
I have two questions about this:
There is only one entity without a parent here - that is, A. It is therefore a root entity of the sole entity group that contains A, B, C, D and E. Entity group is simply a distinct tree of entities linked by parent-child relationship.
As for write limit, it applies to whole entity group. Hence you cannot have more than five updates per second to either of your entities (A, B, C, D or E) since they all belong to the same group.
You can find more info on avoid the so-called datastore contention (updating entities too often) in this article.
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