User:Ori.livneh

Redis

Useful miscellany from the redis-db list

Memory usage of redis suspiciously exceeds size of dump

• What types of keys do you have? How big are they? What are they storing?
• In INFO output: memory fragmentation ratio, used_memory_rss
• Debug memory use with DEBUG OBJECT <key>

Sets

• It's not documented, but you can use ZINTERSTORE and ZUNIONSTORE with SETs in Redis, they act as though their members all have a score of 1.

• BLPOP will block the connection until a new item is available to pop from a list

Misc

"Massively scalable counter systems like rainbird are intended for high cardinality data sets with pre-defined hierarchical drill-downs. But they break down when supporting arbitrary drill downs across all dimensions."

Rainbird data model

struct Event {
   i32 timestamp,
   string category,
   list<string> key,
   i64 value,
   optional set<Property> properties,
   optional map<Property, i64> propertiesWithCounts
}

Clojure

22:20 (SrPx) ns creates a namespace and uses it, right? mpan
22:20 (SrPx) so it is like a thing you call once?
22:20 shachaf has left ()
22:20 (SrPx) I'm avoiding it because I do not understand. do I have to name it following some convention based on my files or something?
22:21 (mpan) uh, usually it goes like this
22:21 (mpan) you have separate namespaces, one per file, with corresponding names
22:21 (mpan) the ns statement switches the currently-used namespace for evaluating stuff
22:22 (mpan) so if you eval something, it's done so in a given namespace
22:22 (mpan) so at the repl, you can use ns to switch to evaling stuff in the context of a different namespace
22:23 (mpan) http://blog.8thlight.com/colin-jones/2010/12/05/clojure-libs-and-namespaces-require-use-import-and-ns.html this might help
22:23 (mpan) it covers both separating stuff into namespaces and bringing stuff in from them
22:24 eldariof has joined (~CLD@pppoe-222-244-dyn-sr.volgaline.ru)
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22:24 (SrPx) ok thank you mpan
22:24 (mpan) you're always in some name space or another
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22:24 (mpan) and you could switch between them with ns calls
22:25 (mpan) the reason for the naming convention and file structure is so that the runtime knows where to look when you want to bring something in