bloomfilter | Bloomfilter written in Golang , includes rotation and RPC
kandi X-RAY | bloomfilter Summary
kandi X-RAY | bloomfilter Summary
A Bloom filter is a space-efficient probabilistic data structure used to determine whether an element belongs to a set or not. The Bloom filter allows false positives (maybe in the set) but never false negatives (definitely not in set) . If you are new to bloomfilters, give Bloom Filters by Example a read. The bloomfilter package is suitable for caching filtering, decentralized aggregation, search large chemical structure databases and many other applications. More specifically, we use this package in production with KrakenD to distributedly reject JWT tokens as it allows us to perform massive rejections with very little memory consumption. For instance, 100 million tokens of any size consume around 0.5GB RAM (with a rate of false positives of 1 in 999,925,224 tokens), and lookups are completed in constant time (k number of hashes). These numbers are impossible to get with a key-value or a relational database.
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Top functions reviewed by kandi - BETA
- Main entry point
- Union returns the union of the two Bloomfilter .
- Register creates a new Rejecter
- Serve starts a Bloomfilter RPC server
- New creates a new bloom filter
- OptimalHashFactory returns a hash factory for hashing the given number of bits .
- HashWrapper returns a hash wrapping a hash . Hash .
- DefaultHashFactory returns a set of default hash factory functions .
- M returns the M value of n .
- K returns the number of m .
bloomfilter Key Features
bloomfilter Examples and Code Snippets
Community Discussions
Trending Discussions on bloomfilter
QUESTION
I want to run llvm-slicer (source) for PostgreSQL main executable file (i.e., PG_ROOT/src/backend/postgres) to carry backward slicing on PostgreSQL.
llvm-slicer runs on top of bitcode (.bc file). I have compiled PostgreSQL via ./configure CC=clang-6.0 && make CC=clang-6.0, duiring which, the final compile command that link many .o files together is (very long):
ANSWER
Answered 2022-Mar-22 at 08:54Solution: whole-program-llvm.
It provides tools for building whole-program (or whole-library) LLVM bitcode files from an unmodified C or C++ source package. It currently runs on *nix platforms such as Linux, FreeBSD, and Mac OS X.
QUESTION
Rustaceans. when I start to write a BloomFilter example in rust. I found I have serveral problems have to solve. I struggle to solve them but no progress in a day. I need help, any suggestion will help me a lot, Thanks.
Problems- How to solve lifetime when pass a Iterator into another function?
ANSWER
Answered 2022-Jan-04 at 19:41pub type BitsIter = Box>;
In this case, the object in the box must be valid for the 'static lifetime. This isn't the case for the iterator returned by hash - its limited to the lifetime of self.
Try replacing with:
QUESTION
I am converting a dataframe into a dataset using case class which has a sequence of another case class
...ANSWER
Answered 2021-Nov-22 at 08:18You can explode your array sequence in your IpMonitor objects using explode function, then use a left outer join to match ips present in your Ips dataset, then filter out on ipType == "home" or ip is present in Ips dataset and finally rebuild your IpLocation sequence by grouping by id and collect_list.
Complete code is as follows:
QUESTION
Bloom filters seem promising for a real-world problem I'm working on. A popular java implementation seems to be Google's guava library.
I need to use bloom filter's union operation, and an intersection operation would be good to have, but I can work around it.
In the java docs, I could find no method which performs intersection, while the putAll method seems to work like the union operation.
So my questions are these:
- Is putAll() the correct way to get the union of two bloom filters?
- Is there a non-reflective way to get the intersection of two or more bloom filters?
- In case one is okay with reflection, can we safely perform biwise operations (or, and) on the 'data' field?
If someone could recommend any another popular and well-tested library which is available on maven's repository,and has intersection and union, that'd also solve my needs.
...ANSWER
Answered 2021-Oct-20 at 12:10
- Is putAll() the correct way to get the union of two bloom filters?
Yes, BloomFilter#putAll(BloomFilter) JavaDoc says:
Combines this Bloom filter with another Bloom filter by performing a bitwise OR of the underlying data. The mutations happen to this instance. Callers must ensure the Bloom filters are appropriately sized to avoid saturating them.
The catch is that it'll throw IllegalArgumentException - if isCompatible(that) == false, so if you want to use this method you must make sure that isCompatible returns true:
Determines whether a given Bloom filter is compatible with this Bloom filter. For two Bloom filters to be compatible, they must:
- not be the same instance
- have the same number of hash functions
- have the same bit size
- have the same strategy
- have equal funnels
That said, let's try to answer the second question and find an easier solution.
- Is there a non-reflective way to get the intersection of two or more bloom filters?
Yes, you can use the fact that BloomFilters implement Predicate and use its .and() and .or() methods, remembering that mightContain behavior depends on BloomFilter's parameters.
Example:
QUESTION
I am implementing Bloom Filter in a maven project using
...ANSWER
Answered 2021-Apr-22 at 07:37I stored them as BLOB objects.
QUESTION
I want to conver BloomFilter to String, store it and then get it from String. If I do it using just byte array, without converting to String - everything is ok:
...ANSWER
Answered 2020-Nov-10 at 21:09Converting bytes to a String and back is not always reversible in any Charset. You must use a tool such as Base64 (provided in Guava as BaseEncoding.base64()) to convert a byte array to a string in such a way that you can always convert it back correctly.
QUESTION
I have a large table in Clickhouse with one column called 'Route' which is a comma separated String of id's. It looks e.g. like this: 123421,25245,346263. There can be hundreds of id's in one string.
The table is queried to select Routes that go through certain id's where the order matters, like this:
...ANSWER
Answered 2020-Oct-10 at 18:06To guarantee to apply the index to all data need to re-insert them all. I would recommend creating the test table with the required index and partially fill it. To use it as a playground to find more optimal indexes.
Consider to use hasToken-function or others ones allowed to tokenbf_v1-index (see Skipping index: functions support):
QUESTION
EDIT: Although yukim's workaround does work, I found that by downgrading to JDK 8u251 vs 8u261, the sigar lib works correctly.
- Windows 10 x64 Pro
- Cassandra 3.11.7
NOTE: I have JDK 11.0.7 as my main JDK, so I override JAVA_HOME and PATH in the batch file for Cassandra.
Opened admin prompt and...
java -version
...ANSWER
Answered 2020-Jul-29 at 01:05I think it is sigar-lib that cassandra uses that is causing the problem (especially on the recent JDK8).
It is not necessary to run cassandra, so you can comment out this line from cassandra-env.ps1 in conf directory: https://github.com/apache/cassandra/blob/cassandra-3.11.7/conf/cassandra-env.ps1#L357
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