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[CLJ-1197] Allow fold to parallelize over lazy sequences Created: 10/Apr/13  Updated: 05/Jun/15  Resolved: 27/Sep/13

Status: Closed
Project: Clojure
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Enhancement Priority: Major
Reporter: Paul Butcher Assignee: Unassigned
Resolution: Declined Votes: 0
Labels: reducers

Attachments: File foldable-seq.diff    
Patch: Code


This patch implements foldable-seq, which allows fold to parallelize over a lazy sequence. See this conversation on the Clojure mailing list:


The patch is code only, sadly. No tests because I've not been able to find any existing tests for fold:


However, I have tested it in a separate project successfully.

Comment by Stuart Halloway [ 27/Sep/13 3:12 PM ]

Hi Paul,

Seqs are fundamentally not foldable. That said, what you seem to be trying to do (partition a seq into foldable subjobs) is straightforward in Clojure, see


That said, if the input is truly arriving sequentially, pmap or some variant may do as well or better, e.g.


Comment by Nicola Mometto [ 05/Jun/15 9:55 AM ]

Ticket was declined and marked as resolved but not closed. I'm closing it.

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