I've been writing a few different functions that return and operate on
some very long sequences. Everything I've been doing has been written
in terms of underlying operations that are described as lazy, so I
assumed everything would be fine as long as I don't retain the head of
any sequences.
However, I'm running out of heap space using the following function to
filter my sequences:
(defn documents-from-vendors [doc-seq m]
(filter
(fn [document]
(let [item (. document get Constants/ITEM_ID)]
(contains? m item)))
doc-seq))
I know that filter is lazy, and I see that the documentation of lazy-
cons says that lazy-conses are cached. Cached for what duration ? Does
this mean that filter is not appropriate for use on long sequences, or
is there something else likely to be going on here?
Thanks for your help!
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