don't block logs during iterators by fixing the lock #1802
Merged
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we're currently holding the lock the whole time an iterator is running; it needs to be held separately for each send. instead of doing a bunch of indents, just factor out the locked send into a separate class
although the lock isn't actually shared between processes and the more lightweight threading.Lock could be used, that means it has to be created in run() rather than
__init__