504 Connect to www.youtube.com:80 failed: Too many open files

Dear All,

 I am observing the following error "504 Connect to
www.youtube.com:80failed: Too many open files" when I generate lots of
HTTP traffic using
some web-crawler on Polipo. I understand there are chances system is
running out of descriptors and hence not able to open new TCP scoket which
is resulting into this situation. Can someone help what can be the best way
for not to arrive in this situation.

Thanks,
-Rajeev
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