cantor | high available global sequence generator | Continuous Deployment library
kandi X-RAY | cantor Summary
kandi X-RAY | cantor Summary
Cantor is a global sequence generator service, which is distributed, stateless and high available. Cantor generates unique, relatively orderly and inverse decodable 64-bit integer IDs. This project provides a easy way to use it in your docker environment. In fact, you can only use a few commands to start up all the components the service depends on and the tools, such like monitors and load testing. This project contains several components: - Cantor service: the maintain service of the project - Redis: one of the storage Cantor can depends on, optioanl in runtime - HBase: one of the storage Cantor can depends on, optioanl in runtime - Grafana: used for monitoring Cantor instances - InfluxDB: storage Grafana depends on - JMXTrans: used for collecting the monitor data of Cantor. | 1 bit | 2 bit | 2 bit | 7 bit | 3 bit | 28 bit | 21 bit | |:---- |:---- |:---- |:---- |:---- |:------ |:------ | | Sign bit as 0, never used | Protocol version, supporting 4 versions most | Generation sources descriptor, 4 in most | Custom spaces, 128 spaces most | Cantor service instance number, supporting 4 instances online most | Timestamp, which can be used in 8 years from 2018-01-01 00:00:00 | Sequence, about 13k ids generated per seconds |. In short, Cantor service guarantees that all unique IDs are generated based on its logic clock and a persistent sequence consuming state. When persistence service is down, Cantor service can downgrade to generate ID in local.
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Top functions reviewed by kandi - BETA
- Handles the request
- Computes and returns the next batch
- Gets the sequence from cache
- Gets the sequence id
- Handles a channel read
- Creates a BadHttpResponse object
- Checks if connection is available
- Create table connections for a table
- Check and register a new instance
- Send a heartbeat
- Run all tasks
- Get all the time stamp
- Get timestamp with given category
- Produces a sequence for a given category
- Close hbase connection
- Check redis connection
- Start the server
- Synchronizes the timestamp with the current timestamp
- Get time lattice from hbase table
- Sync current time to redis
- Check the number of servers in redis
- Returns the value for the row
- Registers a handler
- Read all queued items from the queue
- Returns the PathMatcher for the given handler request
- Submits a sequence request
cantor Key Features
cantor Examples and Code Snippets
Community Discussions
Trending Discussions on cantor
QUESTION
I have huge dynamically created tables/matrices in MATLAB of varying first dimension, whose rows represent (sorted) combinations of integers in the range 1-50 of order 6.
I would like to assign to each combination a unique value (hash, ranking), so that I can check if the same combinations appear in different tables. Different combinations are not allowed to have same value assigned, i.e. no collisions. I have to make a lot of such comparisons between a lot of such tables. So, for performance reasons, I would like to accomplish this by vectorization of uint32 operations to make it suitable for GPU acceleration in MATLAB.
Things I have thought of so far:
- Lexicographic ranking: no idea how to vectorize the standard fast recursive algorithms well, and the only option seems to be to
parforit through the rows, which is slower than other options. IIRC, the direct explicit formula, though vectorizable, requires computation of binomials, which in turn requireslog Gammafunction in order to avoid huge factorials +doubletype to avoid collision if I am not mistaken, i.e. is slower because it's 'very numerical'. - Cantor pairing function: one can successively apply Cantor's pairing, which is nice because it's a polynomial expression, but it produces huge numbers well beyond
uint32and is definitely slower than other options. - Base 51 (no pun intended) integers: sends a combination/row vector
(x_1,...,x_6)tox_1 + x_2 * 51 + ... + x_6 * 51^5. This is the fastest I currently have. It's easily vectorizable, but unfortunately still requiresuint64ordoublefor rank-6 combinations of 50 elements, which is slower thanuint32orsingletype operations would be.
So, I guess, I am looking for a 'clever' injective function on these combinations that computes within the
uint32range and is also well vectorizable (in MATLAB).
Any help would be much appreciated!
EDIT: Here is a routine that benchmarks both ranking and searching in uint32, single, and double. I have used MATLAB's gputimeit to produce accurate results.
ANSWER
Answered 2021-May-10 at 12:41You've almost got enough bits for your last idea, so you just need to squeeze a few bits out due to the ordering to get it over the bar. Since the whole sequence is sorted, every pair is also ordered. So use a 50-by-50 look-up table to map the sorted (1st,2nd), (3rd,4th), (5th,6th) pairs into numbers from 0-1274.
Or if you don't want a table, there are fairly simple explicit functions for mapping a pair (i,j) with j>=i to a linear index. Look up upper- or lower-triangular matrix indexing for details on those. (It'll be something along the lines of
n*(n+1)/2 - (n-i)*(n-i-1)/2 + j
with some +/-1's thrown in depending on base-0 or base-1 indexing, and n=50 in your case, but I'm sure I'll get it wrong writing it off-the-cuff.)
Anyway, once you've got three numbers 0-1274, the base-1275 idea will fit in uint32.
QUESTION
I wanted to implement the cantor function in R and plot it. I only know Python and Java so R is new for me. The cantor function is defined as:
Let f0(x) = x.
Then, for every integer n ≥ 0, the next function fn+1(x) will be defined in terms of fn(x) as follows:
Let fn+1(x) = 1/2 × fn(3x), when 0 ≤ x ≤ 1/3 ;
Let fn+1(x) = 1/2, when 1/3 ≤ x ≤ 2/3 ;
Let fn+1(x) = 1/2 + 1/2 × fn(3 x − 2), when 2/3 ≤ x ≤ 1.
This is my code:
...ANSWER
Answered 2021-May-09 at 12:44You can use sapply or a for loop to make this work for vectors.
QUESTION
I'm trying to write something that makes the different iterations of the cantor set. I copied and deleted some of my code and I don't understand why I am getting this undefined error.
...ANSWER
Answered 2021-Mar-11 at 23:02ctx is undefined because the object sheet doesn't have a property called context.
Thus ctx = sheet.context; will fail.
With
QUESTION
I have this code until now:
...ANSWER
Answered 2020-Dec-10 at 16:06First: range(len(cad)) gives you numbers (0,1,2...), not chars from cad. Yo
QUESTION
I have the following data:
...ANSWER
Answered 2020-Jul-21 at 12:53You will need to turn these strings into vectors, and pad them to equal length. I'll show you an example with just partial_x_train_actors_array:
QUESTION
I have a list of names and a list of the alphabet. I am able to determine the number of a single letter at a time. How do I check make python go through my entire alphabet list and append them in order.
...ANSWER
Answered 2020-Mar-30 at 18:12You could modify your code to instead produce a dictionary of counts for each letter
QUESTION
So in short we have an activty with a google maps map and we pu a lat of markers on them. Now we want to be able to click all these markers. We use an onClickListeners for that.
...ANSWER
Answered 2019-Nov-14 at 15:36try this
QUESTION
I have various sets of integers each set can have from 2 to >10 integers with values between 0 and 500ish (variable). I would like to pair them into a unique number. I have explored the Cantor pairing function, but I would have to combine two numbers at a time and for longer groups of number it would soon result in very large numbers.
For example: set 1: [1,12,65,4] will be mapped to a unique value different for the value representing set 2: [1,12,65,2].
Also, another nice to have requirement would be that sets [1,4,78,5] and [1,4,78,10] would be close to each other when represented by a unique number.
Is this possible mathematically?
...ANSWER
Answered 2019-Sep-19 at 16:34I think cantor tuple function could be a solution. Just before that just sort the numbers of the set, and then pass to the cantor tuple function.
In this way, you will get a unique result for each set, and somehow, it could satisfy the nice requirement (Not the best, but could be as a solution).
QUESTION
I have created a program to count the number of each letter with a list of names. The number is then stored in a separate list. I am not trying to print the letter that has the max times used within the original list.
I have tried using the .index(max) function, but that returns the place value. In this case[4]. The letter would be 'E', but i cannot figure out how to get to that.
...ANSWER
Answered 2019-Mar-29 at 23:37I would suggest storing the counts with a dict instead of a list - that way you have a more direct relation between the letter and the count, instead of messing about with offset ascii values.
QUESTION
I am trying make online cantor. i need to get table with currency value from outside API, exactly from that page : http://api.nbp.pl/api/exchangerates/tables/A?format=json I want to get answer in Currency class. Could someone help me with that task ?
...ANSWER
Answered 2019-Mar-29 at 09:38Your json object that you want to deserialize is a jsonArray. You need to deserialize into a list of Currency, instead of a Currency.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install cantor
You can use cantor like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the cantor component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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