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@@ -246,10 +246,12 @@ Example implementation:
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This is used by all result backends except Redis, which increments a
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counter after each task in the header, then applying the callback when the
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-counter exceeds the number of tasks in the set.
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+counter exceeds the number of tasks in the set. *Note:* chords do not properly
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+work with Redis before version 2.2; you will need to upgrade to at least 2.2 to
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+use them.
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The Redis approach is a much better solution, but not easily implemented
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-in other backends (suggestions welcome!)
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+in other backends (suggestions welcome!).
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.. note::
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