Hi all! I have been trying to use Clojure on a student project, but
it's becoming a bit of a nightmare. I wonder whether anyone can
help? I'm not studying computer science, and I really need to be
getting on with the work I'm actually supposed to be doing :)
I am trying to work from a lot of Twitter statuses that I saved to
text file. (Unfortunately I failed to escape quotes and such, so the
JSON is not valid. Anyone know a good way of coping with that?)
Here is my function:
(defn json-seq []
(apply concat
(map #(do (print "f") (str/split (slurp %) #"\nStatusJSONImpl"))
out-files)))
Now there are forty files and five thousand statuses per file, which
sounds like a lot, and I don't suppose I can hope to hold them all in
memory at the same time. But I had thought that my function might
produce a lazy sequence that would be more manageable. However I
typically get:
twitter.core> (nth (json-seq dir-name) 5)
ffff"{createdAt=Fri .... etc. GOOD
twitter.core> (nth (json-seq dir-name) 5000)
ffff
Java heap space
[Thrown class java.lang.OutOfMemoryError] BAD
And at this point my REPL is done for. Any further instruction will
result in another OutOfMemoryError. (Surely that has to be a bug just
there? Has the garbage collector just given up?)
Anyway I am thinking that the sequence is not behaving as lazily as I
need it to. It's not reading one file at a time, and it's not reading
thirty-two as I might expect from "chunks", but something in the
middle. I did try the "dechunkifying" code from page 339 of "Joy of
Clojure", but that doesn't compile at all :(
I do seem to keep running into memory problems with Clojure. I have
2GB RAM and am using Snow Leopard, Aquamacs 2.0, Clojure 1.2.0 beta1
and Leiningen 1.2.0.
Cheers
Alistair
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