bloomfilter | Bloom filters for Java | Hashing library
kandi X-RAY | bloomfilter Summary
kandi X-RAY | bloomfilter Summary
bloomfilter is a pure Java Bloom Filter implementation that provides simple persistable bloom filters. The entire bloom filter is abstracted into various layers so that the same can be changed by pure plug-and-play implementations such as decomposing an object to a byte-stream, or the hash function to be used, or the serialization strategy to be used.
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Top functions reviewed by kandi - BETA
- Adds the given values to the bloom filter
- Adds the given byte array to the bloom filter
- Decodes the given value
- Gets the byte array of data
- Decompose an object
- Puts the given bytes into this sink
- Atomically set bit
- Gets the bit at the specified index
- Divides p by q
- Checks rounding if necessary
- Puts a short into the current byte stream
- OR the bit - wise bit set
- Puts character sequence into sink
- Puts a char into the byte stream
- Puts a float into the current byte stream
- Puts a boolean into the current byte stream
- Puts a long into the current byte stream
- Puts an int into the output stream
- Hashes bytes
- Clears a bit at the specified index
- Puts a double into the sink
- Extend the backing file
- Combine two BitArrays
- Clears the bit at specified index
- Clears the bit set
- Clears the bit array
bloomfilter Key Features
bloomfilter Examples and Code Snippets
Lines of Code : 26License : Permissive (Apache-2.0)
Copy// the maximum number of elements that the filter will contain
int numberOfElements = 1000 * 1000;
// the max false positive probability that is desired
// the lower the value - the more will be the memory usage
double fpp = 0.01d;
// this creates bloomfilter: Bloom filters for Java
Copyright (c) 2014-2018, Sandeep Gupta
https://sangupta.com/projects/bloomfilter
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
com.sangupta
bloomfilter
0.9.0
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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No vulnerabilities reported
Install bloomfilter
You can use bloomfilter 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 bloomfilter 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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