databus | Source-agnostic distributed change data capture system

 by   linkedin Java Version: Current License: Apache-2.0

kandi X-RAY | databus Summary

kandi X-RAY | databus Summary

databus is a Java library typically used in Big Data, Kafka, Spark applications. databus has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has high support. You can download it from GitHub.

[Join the chat at In Internet architectures, data systems are typically categorized into source-of-truth systems that serve as primary stores for the user-generated writes, and derived data stores or indexes which serve reads and other complex queries. The data in these secondary stores is often derived from the primary data through custom transformations, sometimes involving complex processing driven by business logic. Similarly, data in caching tiers is derived from reads against the primary data store, but needs to get invalidated or refreshed when the primary data gets mutated. A fundamental requirement emerging from these kinds of data architectures is the need to reliably capture, flow and process primary data changes. We have built Databus, a source-agnostic distributed change data capture system, which is an integral part of LinkedIn’s data processing pipeline. The Databus transport layer provides latencies in the low milliseconds and handles throughput of thousands of events per second per server while supporting infinite look back capabilities and rich subscription functionality.

            kandi-support Support

              databus has a highly active ecosystem.
              It has 3499 star(s) with 735 fork(s). There are 385 watchers for this library.
              It had no major release in the last 6 months.
              There are 31 open issues and 55 have been closed. On average issues are closed in 324 days. There are 7 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of databus is current.

            kandi-Quality Quality

              databus has 0 bugs and 0 code smells.

            kandi-Security Security

              databus has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              databus code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              databus is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              databus releases are not available. You will need to build from source code and install.
              Build file is available. You can build the component from source.
              Installation instructions are available. Examples and code snippets are not available.
              databus saves you 143258 person hours of effort in developing the same functionality from scratch.
              It has 148852 lines of code, 10588 functions and 824 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed databus and discovered the below as its top functions. This is intended to give you an instant insight into databus implemented functionality, and help decide if they suit your requirements.
            • Process a databus request
            • Constructs a filter based on a set of databus subscriptions
            • Converts JSON string to DBusKeyFilter config map
            • Converts a generic JSONObject to DbusKeyFilter object
            • The main entry point
            • Helper method to parse comma - separated list of arguments
            • Splits a partition into a set of partitions
            • Prints usage information
            • Process a Databus request
            • Process the request
            • Called when a message is received
            • Returns a string representation of this event
            • Finds the file that contains the scn file
            • Entry point for the command line tool
            • Command line parser
            • Gets the latest timestamp
            • Synchronized
            • This method is used to repair the bootstrap checkpoints
            • Decodes a single command
            • Runs the producer
            • Reads events from all sources
            • Main loop
            • Performs the actual processing of a DatabusRequest
            • Adds an event to the buffer
            • Runs the binlog events
            • Handles a databus message
            Get all kandi verified functions for this library.

            databus Key Features

            No Key Features are available at this moment for databus.

            databus Examples and Code Snippets

            No Code Snippets are available at this moment for databus.

            Community Discussions


            Unable to output data entered into a register
            Asked 2022-Apr-15 at 15:21

            I have a simple program. I am trying to input the counter output into a memory address register and output the data that is in the memory address register.

            Memory Address Register Code:



            Answered 2022-Apr-15 at 15:21

            This is the logic for writing to your memory address output register inside your 'MAR' component:



            Chisel persist value in module until new write
            Asked 2021-Dec-02 at 04:17

            I have created a basic module that is meant to represent a unit of memory in Chisel3:



            Answered 2021-Dec-02 at 04:17

            Drakinite's comment is correct. You need to make sure to step the clock in order to see the register latch the value. I tweaked your test to include a couple of steps and it works as expected:



            Best way of dealing with a common/central object
            Asked 2021-Feb-18 at 15:45

            I have a program where I need to read and write data to a common (central?) object from most other obejcts. In a way it acts like a database or perhaps databus if you like. I cannot write it to a file. Currently I do it like this:



            Answered 2021-Feb-18 at 15:09

            The real answer is "don't".

            You can use the Singleton pattern; but, by doing so you are avoiding "object oriented programming" which is the method that Java uses to make the programs maintainable and repairable.

            Once you have a single, central object, you can't modify your code easily in many ways without investigating how the central object is impacted, and then investigating how all the other objects that also use the central object are impacted through the central object.

            Instead create an object for each scenario. This allows you to process two scenarios at a time, which will make life easier when you start to make your programs multi-threaded, something you'll want to do sooner or later, because otherwise you'll only use 1 core in that 8 core processor.

            Your language assumes a central object, so I can't provide an example in your scenario. I'll modify Commmon to Context where Context means "the scenario I'm dealing with now".

            Note that with such a change, you probably shouldn't own the context, you should pass it along.


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install databus

            Databus currently needs gradle version 1.0 or above to build. The commands to build are : * gradle -Dopen_source=true assemble — builds the jars and command line package * gradle -Dopen_source=true clean  — cleans the build directory * gradle -Dopen_source=true test  — runs all the unit-tests that come packaged with the source. Databus will be licensed under Apache 2.0 license.


            See our [wiki]( for full documentation and examples. An example of writing a DatabusRelay is available at To be able to start a relay process, the code is packaged into a startable command-line package. The tarball may be obtained from build/databus2-example-relay-pkg/distributions/databus2-example-relay-pkg.tgz. This relay is configured to get changestreams for a view "Person". After extracting to a directory, please cd to that directory and start the relay using the following command : * ./bin/ person. If the relay is started successfully, the output of the following curl command would look like : * $ curl http://localhost:11115/sources * [{“name”:“”,“id”:40}].
            Find more information at:

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          • CLI

            gh repo clone linkedin/databus

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