THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The sink needs a way to build back pressure, eg, if the throughput limit of the destination is exceeded. Initially we were planning to adopt the isAvailable pattern from the source interface. But the benefits are too vague at this point and it would require substantial changes to the sink API, we. We'll hence start with a blocking implementation of the write
function and see how far we get.
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