I have an Iterator of several million elements, which unfortunately won't fit
into the driver memory at the same time. I would like to save them as object
file in HDFS:

Doing so I am running out of memory on the driver:

Using a stream

also won't work. I cannot further increase the driver memory. Why doesn't it
work out of the box? Shouldn't lazy evaluation and garbage collection
prevent the program from running out of memory? I could manually split the
Iterator into chunks and serialize each chunk, but it feels wrong. What is
going wrong here?




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