pulsar | Apache Pulsar - distributed pub-sub messaging system | Pub Sub library
kandi X-RAY | pulsar Summary
kandi X-RAY | pulsar Summary
Pulsar is a distributed pub-sub messaging platform with a very flexible messaging model and an intuitive client API. Learn more about Pulsar at
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Top functions reviewed by kandi - BETA
- 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 .
pulsar Key Features
pulsar Examples and Code Snippets
License : Strong Copyleft (CC BY-SA 4.0)
Copydistribution(Cards, Distribution) :-
distribution(Cards, [], Distribution).
distribution([], Distribution, Distribution).
distribution([Card|Cards], Accumulator, Distribution) :-
suit(Card, Suit),
update(Accumulator, Suit, NewERROR: 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
org.jooq
jooq-codegen-maven
3.16.5
@echo off
rem =============================================================================
rem Purpose & Instructions:
rem =============================================================================
rem Because MS-Windows assigns a#!/bin/bash
# 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 direwsl -l -v
# Confirm distribution name
wsl --set-version 1
static void main(a) {
WebDriverManager.chromedriver().setup()
WebDriver driver = new ChromeDriver(new ChromeOptions())
driver.get('https://nbc.com')
300.times {
driver.executeScript("window.open('https://nbc.com')")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
plot!(vᵪ, CREATE TABLE .yourTable
WITH
(
DISTRIBUTION = ROUND_ROBIN,
CLUSTERED COLUMNSTORE INDEX
)
AS
SELECT *
FROM .yourTable;
OPTION ( LABEL = 'CTAS: copy yourTable to new schema' );
>> A = [1 2 3 4];
>> x = A(randi(length(A),1))
x =
4
>> x = A(randi(length(A),1))
x =
3
>> help randi
randi Pseudorandom integers from a uniform discrete distribution.
R Community Discussions
Trending Discussions on pulsar
QUESTION
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.
...ANSWER
Answered 2022-Mar-24 at 20:25You 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?
QUESTION
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:
...ANSWER
Answered 2022-Feb-21 at 00:34As 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
QUESTION
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/
...ANSWER
Answered 2022-Feb-09 at 15:17That enhancement is not complete yet
https://github.com/apache/pulsar/issues/12949
It is there for Java
https://medium.com/streamnative/apache-pulsar-2-7-0-25c505658589
QUESTION
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
...ANSWER
Answered 2022-Feb-07 at 19:16The 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.
QUESTION
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?
...ANSWER
Answered 2022-Jan-27 at 20:48The 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.
QUESTION
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:
...ANSWER
Answered 2022-Jan-10 at 17:08In order to resolve this issue I followed these steps:
Shell into the pulsar-broker pod
Change directories into the /pulsar/bin directory
Use pulsar-admin CLI to find the subscription that needs to be cleared
./pulsar-admin topics subscriptionsClear the backlog with the following command
./pulsar-admin topics clear-backlog -sShell out and delete the Connector Classic REST pod
After a few minutes the service comes back up
QUESTION
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 ...ANSWER
Answered 2021-Dec-24 at 11:08Private keys are never meant to be sent as a header in a web request. Perhaps the public key.
When you try to send this:
QUESTION
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?
...ANSWER
Answered 2021-Dec-24 at 09:31You may use cat to get the output from the file location and then stored that to the variable
QUESTION
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:
...ANSWER
Answered 2021-Dec-10 at 09:31This 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
QUESTION
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
...ANSWER
Answered 2021-Dec-07 at 15:31It'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.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install pulsar
Java JDK 11 or JDK 8
Maven 3.6.1+
zip
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.
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