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  1. PO
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    <p>Well, since nobody is up to help me, here is a "dumb" solution, in pseudocode.</p> <ol> <li><p>Get random element:</p> <pre><code>function maybe_get_next_item() item_name = SRANDMEMBER "items-set" item_key = "items:" + item_name new_item_count = DECR (item_key) if new_item_count &lt; 0 then LOCK -- As explained in SETNX docs new_item_count = GET (item_key) -- More added while we were locking? if new_item_count and new_item_count &lt; 0 then SREM (item_name) -- No, expire it end UNLOCK end if new_item_count and new_item_count &gt;= 0 then return item_name end return false -- this item not found end function get_next_item() item_name = maybe_get_next_item() while not item_name and (SCARD "items-set" &gt; 0) do item_name = maybe_get_next_item() end return item_name -- false if all items are expended end </code></pre></li> <li><p>Insert new elements</p> <pre><code>function insert_items(item_name, amount) LOCK -- As explained in SETNX docs SADD "items-set" (item_name) INCRBY ("items:" + item_name) amount UNLOCK end </code></pre></li> </ol> <p>Please do suggest a better solution if it exists, I'm still groking Redis, and may miss something obvious.</p> <p>I suspect that <code>LOCK</code>/<code>UNLOCK</code> in <code>insert_items()</code> may be superfluous and can be replaced with <code>MULTI</code>/<code>EXEC</code>, but I think that it is needed for <code>LOCK</code>/<code>UNLOCK</code> in <code>maybe_get_next_item()</code> to work properly (which I do not know how to replace with <code>MULTI</code>/<code>EXEC</code>)...</p>
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    1. POStoring huge randomized list of similar items in Redis
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    1. USAlexander Gladysh
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    1. POStoring huge randomized list of similar items in Redis
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    1. CONote that probabilities here are skewed, as number of identical items does not play any part in the chance to get the item. This is okay for my particular use-case.
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      1. USAlexander Gladysh
    2. COOn 2.2 better approach would be to use WATCH: http://stackoverflow.com/questions/5118807/redis-how-to-atomically-remove-an-item-from-set-if-a-counter-in-another-key-is-b
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