[google-appengine] Entity groups - does work on a child lock the parent, and vice versa?

[Mark]

Hi,

Let's say we have an entity group hierarchy like this:

    Foo
       |
       --- Grok

Foo is the entity parent. Any time I add a Grok instance to the
datastore, does the parent Foo instance have to be locked? Example:

    Transaction tx = pm.currentTransaction();
    try {
        tx.begin();

        Grok grok = new Grok();
        pm.makePersistent(grok);

        tx.commit(); // will a parent Foo get locked now?
    }
    finally {
        if (tx.isActive()) {
            tx.rollback();
    }

I guess the same question then - if I'm performing a transaction on
the parent Foo, will all its Grok instances be locked?

Thanks

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