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+---
+layout: post
+title: "Iterate the keyspace in redis: SCAN"
+date: 01.11.2013 18:40
+---
+
+A few days ago antirez finally [merged][pr] the SCAN algorithm written by
+[Pieter Noordhuis](https://twitter.com/pnoordhuis). With it it's now possible
+to iterate the whole keyspace (or specific values in a set/sorted set/hash)
+without a huge performance impact on the rest of the server (as `KEYS` would do
+blocking on huge datasets).
+Read more about the usage in [antirez' blog][antirez-63] or read the implementation
+and explanation on [github][implementation] (I need to do that as well).
+For end users the usage is [documented][scan-docu].
+
+After the code was finally merged into unstable and 2.8 I sat down bringing
+that feature into the redis client library and with that also into
+[try.redis.io][tryredis]
+The client code is rather simple and was quickly merged ([461dd43][scan-in-rb])
+and is now also used in [try.redis][tryredis-scan].
+
+A small thing I discovered playing around and testing the new code was a
+crashing bug ([#1354][redis-crash]) with numeric values, but this was fixed as
+well. Another thing was that the 2.8 was not compiling after the fix was added,
+due to some new code only in the unstable branch. In absence of an official CI
+server for redis (we once had one, [but it's currently disabled][twitter-disabled]
+and will be back soon™) I went ahead and started the CI server on my own server:
+
+<http://tmp.fnordig.de/redis/ci/>
+
+Currently there is one failing test for 2.8 and unstable but I think we will get that fixed as well
+(just the memory efficiency test).
+
+With 2.8 already in RC-state we will soon have all the awesome new features in a stable redis release.
+
+[pr]: https://github.com/antirez/redis/pull/579
+[implementation]: https://github.com/antirez/redis/blob/dfeaa84d462a93070ee63ec87278a30d3105fa8d/src/dict.c#L663-L819
+[antirez-63]: http://antirez.com/news/63
+[scan-docu]: http://redis.io/commands/scan
+[scan-in-rb]: https://github.com/redis/redis-rb/commit/461dd435a7aa3f3b0077f481c5d4219913d6705c
+[redis-crash]: https://github.com/antirez/redis/issues/1354
+[tryredis-scan]: https://github.com/badboy/try.redis/commit/1601dd931607d2872b6387209290b43dc00ad7da
+[tryredis]: http://try.redis.io
+[twitter-disabled]: https://twitter.com/antirez/status/395964119859613697