pulsar | Apache Pulsar - distributed pub-sub messaging system | Pub Sub library

 by   apache Java Version: 3.1.0 License: Apache-2.0

kandi X-RAY | pulsar Summary

kandi X-RAY | pulsar Summary

pulsar is a Java library typically used in Messaging, Pub Sub, Kafka applications. pulsar 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, Maven.

Pulsar is a distributed pub-sub messaging platform with a very flexible messaging model and an intuitive client API. Learn more about Pulsar at

            kandi-support Support

              pulsar has a highly active ecosystem.
              It has 12790 star(s) with 3310 fork(s). There are 409 watchers for this library.
              There were 8 major release(s) in the last 6 months.
              There are 900 open issues and 5349 have been closed. On average issues are closed in 92 days. There are 247 open pull requests and 0 closed requests.
              It has a positive sentiment in the developer community.
              The latest version of pulsar is 3.1.0

            kandi-Quality Quality

              pulsar has 0 bugs and 0 code smells.

            kandi-Security Security

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

            kandi-License License

              pulsar 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

              pulsar releases are available to install and integrate.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions, examples and code snippets are available.
              It has 444636 lines of code, 28552 functions and 3482 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed pulsar and discovered the below as its top functions. This is intended to give you an instant insight into pulsar implemented functionality, and help decide if they suit your requirements.
            • Creates a BitSetRecyclable from the specified ByteBuffer .
            • Prints statistics for a topic .
            • Handles a command producer .
            • Update a function .
            • Update a source .
            • Updates an existing sink .
            • Calculate cursor back cursors counters .
            • Returns command to execute .
            • Truncate ledgers .
            • Returns the internal statistics for this topic .
            Get all kandi verified functions for this library.

            pulsar Key Features

            No Key Features are available at this moment for pulsar.

            pulsar Examples and Code Snippets

            Get a distribution of a list in prolog
            Lines of Code : 37dot img1License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            distribution(Cards, Distribution) :-
                distribution(Cards, [], Distribution).
            distribution([], Distribution, Distribution).
            distribution([Card|Cards], Accumulator, Distribution) :-
                suit(Card, Suit),
                update(Accumulator, Suit, New
            Pip not Working couldn't find versions that satisfies the requirement
            Lines of Code : 3dot img2License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            ERROR: Could not find a version that satisfies the requirement psycopg2== (from versions: 2.0.10, 2.0.11, 2.0.12, 2.0.13, 2.0.14, 2.2.0, 2.2.1, 2.2.2, 2.3.0, 2.3.1, 2.3.2, 2.4, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.5, 2.5.1, 2.5.2, 2
            jOOQ throws class file for java.util.concurrent.Flow not found for where condition
            Javadot img3Lines of Code : 15dot img3License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            copy iconCopy
            @echo off
            rem =============================================================================
            rem Purpose & Instructions:
            rem =============================================================================
            rem Because MS-Windows assigns a
            how to install Nginx on CentOs7 without internet connection with root permission?
            Lines of Code : 132dot img5License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            # This script is used to fetch external packages that are not available in standard Linux distribution
            # Example: ./fetch-external-dependencies ubuntu18.04
            # Script will create nms-dependencies-ubuntu18.04.tar.gz in local dire
            How would I use Arduino-CLI in WSL?
            Lines of Code : 4dot img6License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            wsl -l -v
            # Confirm distribution name
            wsl --set-version  1
            copy iconCopy
            static void main(a) {
                WebDriver driver = new ChromeDriver(new ChromeOptions())
                300.times {
            Plotting two distributions on same plot
            Lines of Code : 15dot img8License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            using Plots, Distributions
            vᵤ = -0.1:0.005:4
            f_s0 = pdf.(Uniform(0,1), vᵤ) # uniform distribution with area 1
            plot(vᵤ, f_s0, label="f_s0", framestyle=:box)
            vᵪ = 0:0.005:4
            F_s = pdf.(Chi(3), vᵪ)  # chi distribution with area 1
            How to copy all tables, stored procedures to another schema in Synapse data warehouse?
            Lines of Code : 11dot img9License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
             CREATE TABLE .yourTable
                 DISTRIBUTION = ROUND_ROBIN,
             SELECT *
             FROM .yourTable;
             OPTION ( LABEL = 'CTAS: copy yourTable to new schema' );
            how can I select a random element from an array in matlab
            Lines of Code : 18dot img10License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            >> A = [1 2 3 4];
            >> x = A(randi(length(A),1))
            x =
            >> x = A(randi(length(A),1))
            x =
            >> help randi
             randi Pseudorandom integers from a uniform discrete distribution.

            Community Discussions


            error 404 when try to make oauth in pulsar stream native cluster
            Asked 2022-Mar-24 at 21:35

            Hello I am triying to connect to apache pulsar cluster using stream native, I don't have problems with token oauth, but when I try to make Oauth I always get malformed responde or 404 I am using curl and python client, and following their instructions,like this.



            Answered 2022-Mar-24 at 20:25

            You may need the full path to the private key. make sure it has permissions.

            also make sure your audience is correct

            what is pulsar URL format?

            Source https://stackoverflow.com/questions/71577989


            Kubernetes Statefulsets: Restart all pods concurrently (instead of in sequence)
            Asked 2022-Feb-21 at 00:34

            I have a use-case for concurrent restart of all pods in a statefulset.

            Does kubernetes statefulset support concurrent restart of all pods?

            According to the statefulset documentation, this can be accomplished by setting the pod update policy to parallel as in this example:



            Answered 2022-Feb-21 at 00:34

            As the document pointed, Parallel pod management will effective only in the scaling operations. This option only affects the behavior for scaling operations. Updates are not affected.

            Maybe you can try something like kubectl scale statefulset producer --replicas=0 -n ragnarok and kubectl scale statefulset producer --replicas=10 -n ragnarok

            According to documentation, all pods should be deleted and created together by scaling them with the Parallel policy.

            Reference : https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#parallel-pod-management

            Source https://stackoverflow.com/questions/71196230


            How to work with protobuf schema messages in Python Apache pulsar pulsar-client package?
            Asked 2022-Feb-09 at 15:17

            Is there a way to publish message to an Apache Pulsar topic using Protobuf schema using pulsar-client package using python?

            As per the documentation, it supports only Avro, String, Json and bytes. Any work around for this? https://pulsar.apache.org/docs/ko/2.8.1/client-libraries-python/



            Answered 2022-Feb-09 at 15:17


            Apache Pulsar: Access state storage in LocalRunner not working
            Asked 2022-Feb-07 at 19:16

            I'm trying to implement a simple Apache Pulsar Function and access the State API in LocalRunner mode, but it's not working.

            pom.xml snippet



            Answered 2022-Feb-07 at 19:16

            The issue is with the name you chose for your function, "Test Function". Since it has a space in it, that causes issues later on inside Pulsar's state store when it uses that name for the internal storage stream.

            If you remove the space and use "TestFunction" instead, it will work just fine. I have confirmed this myself just now.

            Source https://stackoverflow.com/questions/70621132


            non-persistent message is lost when throughput is high
            Asked 2022-Jan-27 at 20:48

            I found that non-persistent messages are lost sometimes even though the my pulsar client is up and running. Those non-persistent messages are lost when the throughput is high (more than 1000 messages within a very short period of time. I personally think that this is not high). If I increase the parameter receiverQueueSize or change the message type to persistent message, the problem is gone.

            I check the Pulsar source code (I am not sure this is the latest one)


            and I think that Pulsar simply ignore those non-persistent messages if no consumer is available to handle the newly arrived non-persistent messages. "No consumer" here means

            • no consumer subscribe the topic
            • OR all consumers are busy on processing messages received before

            Is my understanding correct?



            Answered 2022-Jan-27 at 20:48

            The Pulsar broker does not do any buffering of messages for the non-persistent topics, so if consumers are not connected or are connected but not keeping up with the producers, the messages are simply discarded.

            This is done because any in-memory buffering would be anyway very limited and not sufficient to change any of the semantics.

            Non-persistent topics are really designed for use cases where data loss is an acceptable situation (eg: sensors data which gets updates every 1sec and you just care about last value). For all the other cases, a persistent topic is the way to go.

            Source https://stackoverflow.com/questions/70872157


            ProducerBlockedQuotaExceededError: Cannot create producer on topic with backlog quota exceeded
            Asked 2022-Jan-10 at 17:08

            I have a Lucidworks Fusion 5 kubernetes installation setup on AWS EKS and currently one of the services, Connector Classic REST service, is experiencing an outage. After digging into the logs I found:



            Answered 2022-Jan-10 at 17:08

            In order to resolve this issue I followed these steps:

            1. Shell into the pulsar-broker pod

            2. Change directories into the /pulsar/bin directory

            3. Use pulsar-admin CLI to find the subscription that needs to be cleared

              ./pulsar-admin topics subscriptions

            4. Clear the backlog with the following command

              ./pulsar-admin topics clear-backlog -s

            5. Shell out and delete the Connector Classic REST pod

            6. After a few minutes the service comes back up

            Source https://stackoverflow.com/questions/70625439


            Pass private key as header in curl PUT returning error for illegal character
            Asked 2021-Dec-24 at 14:45

            I have a .pem file containing my private key that I need to pass as an authorization header.

            I've tried just using the command $(cat $REPO_ROOT/pulsar/tls/broker/broker.key.pem) but I'm getting the response:

            Bad Message 400 ...


            Answered 2021-Dec-24 at 11:08

            Private keys are never meant to be sent as a header in a web request. Perhaps the public key.

            When you try to send this:

            Source https://stackoverflow.com/questions/70471843


            How to pass authorization key in shell script curl command without header
            Asked 2021-Dec-24 at 09:31

            In a shell script, I need to pull a private key from a .pem file. When I set my AUTORIZATION variable to the path, the variable is only the filepath string, not the actual filepath.

            If I change my AUTHORIZATION variable to cat it imports the header and footer i.e. -----BEGIN RSA PRIVATE KEY... END RSA PRIVATE KEY-----

            How do I pull out the RSA key without the header and footer?



            Answered 2021-Dec-24 at 09:31

            You may use cat to get the output from the file location and then stored that to the variable

            Source https://stackoverflow.com/questions/70470935


            Event-time Temporal Join in Apache Flink only works with small datasets
            Asked 2021-Dec-10 at 09:31

            Background: I'm trying to get an event-time temporal join working with two 'large(r)' datasets/tables that are read from a CSV-file (16K+ rows in left table, somewhat less in right table). Both tables are append-only tables, i.e. their datasources are currently CSV-files, but will become CDC changelogs emitted by Debezium over Pulsar. I am using the fairly new SYSTEM_TIME AS OF syntax.

            The problem: join results are only partly correct, i.e. at the start (first 20% or so) of the execution of the query, rows of the left-side are not matched with rows from the right side, while in theory, they should. After a couple of seconds, there are more matches, and by the time the query ends, rows of the left side are getting matched/joined correctly with rows of the right side. Every time that I run the query it shows other results in terms of which rows are (not) matched.

            Both datasets are not ordered by their respective event-times. They are ordered by their primary key. So it's really this case, only with more data.

            In essence, the right side is a lookup-table that changes over time, and we're sure that for every left record there was a matching right record, as both were created in the originating database at +/- the same instant. Ultimately our goal is a dynamic materialized view that contains the same data as when we'd join the 2 tables in the CDC-enabled source database (SQL Server).

            Obviously, I want to achieve a correct join over the complete dataset as explained in the Flink docs
            Unlike simple examples and Flink test-code with a small dataset of only a few rows (like here), a join of larger datasets does not yield correct results.

            I suspect that, when the probing/left table starts flowing, the build/right table is not yet 'in memory' which means that left rows don't find a matching right row, while they should -- if the right table would have started flowing somewhat earlier. That's why the left join returns null-values for the columns of the right table.

            I've included my code:



            Answered 2021-Dec-10 at 09:31

            This sort of temporal/versioned join depends on having accurate watermarks. Flink relies on the watermarks to know which rows can safely be dropped from the state being maintained (because they can no longer affect the results).

            The watermarking you've used indicates that the rows are ordered by MUT_TS. Since this isn't true, the join isn't able to produce complete results.

            To fix this, the watermarks should be defined with something like this

            Source https://stackoverflow.com/questions/70295647


            does pulsar support multiple bookkeeper replicas in different clusters
            Asked 2021-Dec-07 at 15:31

            I have a use case where requires data backup across multiple data centers and needs strong consistency. The ideal view is each segment is replicated to three clusters located at three different data centers. pulsar supports using multiple clusters as a large bookie pool but I didn't find how to configure the replicas in different clusters. Anyone has similar use case before? i think it should be not hard to do considering pulsar separate broker and storage + replicas in different clusters



            Answered 2021-Dec-07 at 15:31

            It's possible to enable a region aware placement policy of bookies (parameter bookkeeperClientRegionawarePolicyEnabled). You'll also need to configure the bookie region with the admin command set-bookie-rack This is not much documented in Pulsar/BookKeeper docs. See this blog post for more details : https://techblog.cdiscount.com/ensure-cross-datacenter-guaranteed-message-delivery-and-resilience-with-apache-pulsar/

            Beware that due to the cross-region latency between the brokers and the bookies, the throughput will drop but that can't really be helped if you need strong consistency even in the case of a region failure.

            Source https://stackoverflow.com/questions/70119490

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


            No vulnerabilities reported

            Install pulsar

            Compile and install individual module.
            Java JDK 11 or JDK 8
            Maven 3.6.1+
            Run Individual Unit Test:.
            Docker images must be built with Java 8 for branch-2.7 or previous branches because of issue 8445. Java 11 is the recommended JDK version in master/branch-2.8. This builds the docker images apachepulsar/pulsar-all:latest and apachepulsar/pulsar:latest. After the images are built, they can be tagged and pushed to your custom repository. Here's an example of a bash script that tags the docker images with the current version and git revision and pushes them to localhost:32000/apachepulsar.
            Apache Pulsar is using lombok so you have to ensure your IDE setup with required plugins.
            Refer to the docs README.


            Pulsar Translation
            Find more information at:

            Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items

            Find more libraries
          • HTTPS


          • CLI

            gh repo clone apache/pulsar

          • sshUrl


          • Stay Updated

            Subscribe to our newsletter for trending solutions and developer bootcamps

            Agree to Sign up and Terms & Conditions

            Share this Page

            share link

            Explore Related Topics

            Reuse Pre-built Kits with pulsar

            Consider Popular Pub Sub Libraries


            by greenrobot


            by apache


            by celery


            by apache


            by apache

            Try Top Libraries by apache


            by apacheTypeScript


            by apacheTypeScript


            by apacheJava


            by apacheScala


            by apachePython