Check-and-increment a counter in Redis - Stack Overflow You can use Redis INCR safely here INCR returns the value post the increment You check the value returned by INCR first ( see there is no need to do a GET ) proceed to do the operation based on that value Only thing is you would have to set your INCR return value threshold as N+1 for limiting to N operations i e one extra redis operation
A race condition when using Redis command incr and expire local v = redis call('INCR', ARGV[1]) if v == 1 then redis call('EXPIRE', ARGV[1], ARGV[2]) end return v The logic is really simple: We are storing the return value of a INCR command into a variable labeled v, then we check if v value is 1 (first increment) if it is, we call the command EXPIRE for that key and then we return the value of v
Redis incrementing a numeric value - Stack Overflow That's also expected - calling INCR on a nonexisting key implicitly initializes its value to 0 IIRC, this is well referenced in the documentation IIRC, this is well referenced in the documentation – Itamar Haber
What is the race condition for Redis INCR Rate Limiter 2? value = INCR(ip) IF value == 1 THEN EXPIRE(ip, 1) END IF value <= 10 THEN return true ELSE return false END Wrap the above code into a Lua script to ensure it runs atomically If this script returns true, perform the API call Otherwise, do nothing
how to increment variable by 0. 5 in using for loop? By default, incr increments by 1 unit when no specific number is mentioned incr i 2 will increment i by 2 on each iteration incr i -1 will decrement i by 1 on each iteration You can thus change the number to be whatever you need it to be The only problem is that you can only increment by an integer So you'll have to use something else for
Redis - Using Incr value in a transaction - Stack Overflow By doing the above, INCR automatically locks the "id" key, increments it for you, unlocks it, and returns it to you Thus, there is no way for anyone to get a duplicate user id using the code above It also has the benefit of never really being able to fail, unlike WATCH GET, where you'd have to check for failures and run your queries again if
how to increase the variable in a loop in TCL? - Stack Overflow Stack Overflow for Teams Where developers technologists share private knowledge with coworkers; Advertising Reach devs technologists worldwide about your product, service or employer brand
Will redis incr command can be limitation to specific number? So we planned to use incr command to add the storage value from 0 to 10 In theory, this plan is no problem with this scenario Before start, we did a performance test on the incr command, the result appeared that using incr to do limitation to the goods storage may be unrealiable The testing code below：
Wheres the race condition in MULTI; INCR; EXPIRE NX; EXEC The Redis INCR docs have some examples of using that command for a Rate Limiter based on IP addresses For instance, maintain a counter with a time-window as key, and INCR EXPIRE it in a single transaction via MULTI EXEC: ts = CURRENT_UNIX_TIME() keyname = ip+":"+ts MULTI INCR(keyname) EXPIRE(keyname,10) EXEC
Redis C# - Using Incr value in a transaction - Stack Overflow I'm trying use Redis INCR and the incremented value to be used as a field in a Hash from C# using StackExchange Redis This question points similar to what I need, but in Node The below is something