kafka | Mirror of Apache Kafka | Pub Sub library

 by   apache Java Version: 3.5.0-rc1 License: Apache-2.0

kandi X-RAY | kafka Summary

kandi X-RAY | kafka Summary

kafka is a Java library typically used in Messaging, Pub Sub, Kafka, Spark, Hadoop applications. kafka has no bugs, it has build file available, it has a Permissive License and it has medium support. However kafka has 3 vulnerabilities. You can download it from GitHub.

Mirror of Apache Kafka

            kandi-support Support

              kafka has a medium active ecosystem.
              It has 25123 star(s) with 12701 fork(s). There are 1083 watchers for this library.
              It had no major release in the last 6 months.
              kafka has no issues reported. There are 1037 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of kafka is 3.5.0-rc1

            kandi-Quality Quality

              kafka has no bugs reported.

            kandi-Security Security

              kafka has 3 vulnerability issues reported (0 critical, 2 high, 1 medium, 0 low).

            kandi-License License

              kafka 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

              kafka 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 not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed kafka and discovered the below as its top functions. This is intended to give you an instant insight into kafka implemented functionality, and help decide if they suit your requirements.
            • Mute all the idle connections .
            • Handles a produce response .
            • Bootstrap a cluster with the given addresses .
            • Generate the size of a variable length field .
            • Perform a constrained assignment .
            • Returns the default value for a boolean field .
            • Appends a single column value to a StringBuilder .
            • Performs task assignment .
            • Runs the loop .
            • Parse a single API request .
            Get all kandi verified functions for this library.

            kafka Key Features

            No Key Features are available at this moment for kafka.

            kafka Examples and Code Snippets

            No Code Snippets are available at this moment for kafka.

            Community Discussions


            EmbeddedKafka failing since Spring Boot 2.6.X : AccessDeniedException: ..\AppData\Local\Temp\spring.kafka*
            Asked 2022-Mar-25 at 12:39

            e: this has been fixed through Spring Boot 2.6.5 (see https://github.com/spring-projects/spring-boot/issues/30243)

            Since upgrading to Spring Boot 2.6.X (in my case: 2.6.1), I have multiple projects that now have failing unit-tests on Windows that cannot start EmbeddedKafka, that do run with Linux

            There is multiple errors, but this is the first one thrown



            Answered 2021-Dec-09 at 15:51

            Known bug on the Apache Kafka side. Nothing to do from Spring perspective. See more info here: https://github.com/spring-projects/spring-kafka/discussions/2027. And here: https://issues.apache.org/jira/browse/KAFKA-13391

            You need to wait until Apache Kafka 3.0.1 or don't use embedded Kafka and just rely on the Testcontainers, for example, or fully external Apache Kafka broker.

            Source https://stackoverflow.com/questions/70292425


            Exception in thread "main" joptsimple.UnrecognizedOptionException: zookeeper is not a recognized option
            Asked 2022-Mar-24 at 12:28

            I am new to kafka and zookepper, and I am trying to create a topic, but I am getting this error -



            Answered 2021-Sep-30 at 14:52

            Read the official Kafka documentation for the version you downloaded, and not some other blog/article that you might have copied the command from

            zookeeper is almost never used for CLI commands in current versions

            If you run bin\kafka-topics on its own with --help or no options, then it'll print the help messaging that shows all available arguments.

            Source https://stackoverflow.com/questions/69297020


            How to avoid publishing duplicate data to Kafka via Kafka Connect and Couchbase Eventing, when replicate Couchbase data on multi data center with XDCR
            Asked 2022-Feb-14 at 19:12

            My buckets are:

            • MyDataBucket: application saves its data on this bucket.
            • MyEventingBucket: A couchbase eventing function extracts the 'currentState' field from MyDataBucket and saves it in this bucket.

            Also, I have a kafka couchbase connector that pushs data from MyEventingBucket to kafka topic.

            When we had a single data center, there wasn't any problem. Now, we have three data centers. We replicate our data with XDCR between data centers and we work as active-active. So, write requests can be from any data center.

            When data is replicated on other data centers, the eventing service works on all data centers, and the same data is pushed three-time (because we have three data centers) on Kafka with Kafka connector.

            How can we avoid pushing duplicate data o Kafka?

            Ps: Of course, we can run an eventing service or Kafka connector in only one data center. So, we can publish data on Kafka just once. But this is not a good solution. Because we will be affected when a problem occurs in this data center. This was the main reason of using multi data center.



            Answered 2022-Feb-14 at 19:12

            Obviously in a perfect world XDCR would just work with Eventing on the replicated bucket.

            I put together an Eventing based work around to overcome issues in an active / active XDCR configuration - it is a bit complex so I thought working code would be best. This is one way to perform the solution that Matthew Groves alluded to.

            Documents are tagged and you have a shared via XDCR "cluster_state" document (see comments in the code) to coordinated which cluster is "primary" as you only want one cluster to fire the Eventing function.

            I will give the code for an Eventing function "xcdr_supression_700" for version 7.0.0 with a minor change it will also work for 6.6.5.

            Note, newer Couchbase releases have more functionality WRT Eventing and allow the Eventing function to be simplified for example:

            • Advanced Bucket Accessors in 6.6+ specifically couchbase.replace() can use CAS and prevent potential races (note Eventing does not allow locking).
            • Timers have been improved and can be overwritten in 6.6+ thus simplifying the logic needed to determine if a timer is an orphan.
            • Constant Alias bindings in 7.X allow the JavaScript Eventing code identical between clusters changing just a setting for each cluster.

            Setting up XDCR and Eventing

            The following code will successfully suppress all extra Eventing mutations on a bucket called "common" or in 7.0.X a keyspace of "common._default._default" with an active/active XDCR replication.

            The example is for two (2) clusters but may be extended. This code is 7.0 specific (I can supply a 6.5.1 variant if needed - please DM me)

            PS : The only thing it does is log a message (in the cluster that is processing the function). You can just set up two one node clusters, I named my clusters "couch01" and "couch03". Pretty easy to setup and test to ensure that mutations in your bucket are only processed once across two clusters with active/active XDCR

            The Eventing Function is generic WRT the JavaScript BUT it does require a different constant alias on each cluster, see the comment just under the OnUpdate(doc,meta) entry point.

            Source https://stackoverflow.com/questions/71078871


            How can I register a protobuf schema with references in other packages in Kafka schema registry?
            Asked 2022-Feb-02 at 10:55

            I'm running Kafka schema registry version 5.5.2, and trying to register a schema that contains a reference to another schema. I managed to do this when the referenced schema was in the same package with the referencing schema, with this curl command:



            Answered 2022-Feb-02 at 10:55

            First you should registrer your other proto to the schema registry.

            Create a json (named other-proto.json) file with following syntax:

            Source https://stackoverflow.com/questions/70464651


            MS dotnet core container images failed to pull, Error: CTC1014
            Asked 2022-Jan-26 at 09:25

            I was trying to build a new image for a small dotnet core 3.1 console application. I got an error:

            failed to solve with frontend dockerfile.v0: failed to create LLB definition: failed to copy: httpReadSeeker: failed open: failed to do request: Get https://westeurope.data.mcr.microsoft.com/42012bb2682a4d76ba7fa17a9d9a9162-qb2vm9uiex//docker/registry/v2/blobs/sha256/87/87413803399bebbe093cfb4ef6c89d426c13a62811d7501d462f2f0e018321bb/data?P1=1627480321&P2=1&P3=1&P4=uDGSoX8YSljKnDQVR6fqniuqK8fjkRvyngwKxM7ljlM%3D&se=2021-07-28T13%3A52%3A01Z&sig=wJVu%2BBQo2sldEPr5ea6KHdflARqlzPZ9Ap7uBKcEYYw%3D&sp=r&spr=https&sr=b&sv=2016-05-31&regid=42012bb2682a4d76ba7fa17a9d9a9162: x509: certificate has expired or is not yet valid

            I have checked an old dotnet program which my dockerfile was working perfectly. I got the same error. Then, I jumped to Docker Hub and checked the MS Images to see that all MS images have been updated for an hour. And then they have been updated once again, 10 Minutes ago xD. However, I still cannot pull the base images of mcr.microsoft.com/dotnet/runtime:3.1 and mcr.microsoft.com/dotnet/sdk:3.1. My whole Dockerfile is:



            Answered 2022-Jan-26 at 09:25

            so as @Chris Culter mentioned in a comment above, I just restarted my machine and it works again.

            It is kind of strange because I already updated my Docker Desktop, restarted, and cleaned/ purged the docker data. None of those helped, just after restarting my windows it works again!

            Source https://stackoverflow.com/questions/68561615


            How to make a Spring Boot application quit on tomcat failure
            Asked 2022-Jan-15 at 09:55

            We have a bunch of microservices based on Spring Boot 2.5.4 also including spring-kafka:2.7.6 and spring-boot-actuator:2.5.4. All the services use Tomcat as servlet container and graceful shutdown enabled. These microservices are containerized using docker.
            Due to a misconfiguration, yesterday we faced a problem on one of these containers because it took a port already bound from another one.
            Log states:



            Answered 2021-Dec-17 at 08:38

            Since you have everything containerized, it's way simpler.

            Just set up a small healthcheck endpoint with Spring Web which serves to see if the server is still running, something like:

            Source https://stackoverflow.com/questions/70378200


            Setting up JAVA_HOME in Ubuntu to point to Window's JAVA_HOME
            Asked 2021-Dec-15 at 10:04

            I tried to run Kafka on CMD in Windows and it's very unstable , constantly giving errors. Then I came across this post, which suggests installing Ubuntu and run Kafka from there.

            I have installed Ubuntu successfully. Given that I have already defined JAVA_HOME=C:\Program Files\Java\jdk1.8.0_231 as one of the environmental variables and CMD recognizes this variable but Ubuntu does not, I am wondering how to make Ubuntu recognize this because at the moment, when i typed java -version, Ubuntu returns command not found.

            Update: Please note that I have to have Ubuntu's JAVA_HOME pointing to the evironmental variable JAVA_HOME defined in my Window system. Because my Java program in eclipse would need to talk to Kafka using the same JVM.

            I have added the two lines below in my /etc/profile file. echo $JAVA_HOME returns the correct path. However, java -version returns a different version of Java installed on Ubuntu, not the one defined in the /etc/profile



            Answered 2021-Dec-15 at 08:16

            When the user logs in, the environment will be loaded from the /etc/profile and $HOME/.bashrc files. There are many ways to solve this problem. You can execute ex manually

            Source https://stackoverflow.com/questions/70360286


            KafkaConsumer: `seekToEnd()` does not make consumer consume from latest offset
            Asked 2021-Dec-08 at 08:06

            I have the following code



            Answered 2021-Dec-03 at 15:55

            The seekToEnd method requires the information on the actual partition (in Kafka terms TopicPartition) on which you plan to make your consumer read from the end.

            I am not familiar with the Kotlin API, but checking the JavaDocs on the KafkaConsumer's method seekToEnd you will see, that it asks for a collection of TopicPartitions.

            As you are currently using emptyList(), it will have no impact at all, just like you observed.

            Source https://stackoverflow.com/questions/70214989


            Kafka integration tests in Gradle runs into GitHub Actions
            Asked 2021-Nov-03 at 19:11

            We've been moving our applications from CircleCI to GitHub Actions in our company and we got stuck with a strange situation.

            There has been no change to the project's code, but our kafka integration tests started to fail in GH Actions machines. Everything works fine in CircleCI and locally (MacOS and Fedora linux machines).

            Both CircleCI and GH Actions machines are running Ubuntu (tested versions were 18.04 and 20.04). MacOS was not tested in GH Actions as it doesn't have Docker in it.

            Here are the docker-compose and workflow files used by the build and integration tests:

            • docker-compose.yml


            Answered 2021-Nov-03 at 19:11

            We identified some test sequence dependency between the Kafka tests.

            We updated our Gradle version to 7.3-rc-3 which has a more deterministic approach to test scanning. This update "solved" our problem while we prepare to fix the tests' dependencies.

            Source https://stackoverflow.com/questions/69284830


            How to parse json to case class with map by jsonter, plokhotnyuk
            Asked 2021-Nov-02 at 06:27

            I want to read json messages from Kafka and put them into another structure of SpecificRecordBase class (avro). The part of the json has dynamic structure for example



            Answered 2021-Nov-02 at 06:27

            One of possible solutions for the proposed data structure that passes decoding tests from the question:

            Source https://stackoverflow.com/questions/69765241

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


            The compilation daemon in Scala before 2.10.7, 2.11.x before 2.11.12, and 2.12.x before 2.12.4 uses weak permissions for private files in /tmp/scala-devel/${USER:shared}/scalac-compile-server-port, which allows local users to write to arbitrary class files and consequently gain privileges.
            When Connect workers in Apache Kafka 2.0.0, 2.0.1, 2.1.0, 2.1.1, 2.2.0, 2.2.1, or 2.3.0 are configured with one or more config providers, and a connector is created/updated on that Connect cluster to use an externalized secret variable in a substring of a connector configuration property value, then any client can issue a request to the same Connect cluster to obtain the connector's task configuration and the response will contain the plaintext secret rather than the externalized secrets variables.

            Install kafka

            You can download it from GitHub.
            You can use kafka 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 kafka 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 .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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