[issue19993] Pool.imap doesn't work as advertised

[Josh Rosenberg]

Josh Rosenberg <shadowranger+python at gmail.com> added the comment:

Related: issue29842 "Make Executor.map work with infinite/large inputs correctly" for a similar problem in concurrent.futures (but worse, since it doesn't even allow you to begin consuming results until all inputs are dispatched).

A similar approach to my Executor.map patch could probably be used with imap/imap_unordered.

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nosy: +josh.r

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<https://bugs.python.org/issue19993>
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