zookeeper | latest information about Apache ZooKeeper | Pub Sub library
kandi X-RAY | zookeeper Summary
kandi X-RAY | zookeeper Summary
For the latest information about Apache ZooKeeper, please visit our website at:.
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Top functions reviewed by kandi - BETA
- Issue a request to a new transaction
- Runs the server .
- Synchronize the transaction with the leader .
- Look up the JMX node .
- Start the leader .
- parse ZK properties
- Generate Csharp code .
- Creates quota for a path .
- Create SaslServer .
- Returns a set of watchers for the given type .
zookeeper Key Features
zookeeper Examples and Code Snippets
private void initialize() {
try {
zkConnection = new ZKConnection();
zkeeper = zkConnection.connect("localhost");
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
public void update(String path, byte[] data) throws KeeperException, InterruptedException {
int version = zkeeper.exists(path, true)
.getVersion();
zkeeper.setData(path, data, version);
}
Option zookeeper is deprecated, use --bootstrap-server instead.
version: '3'
services:
zookeeper:
image: wurstmeister/zookeeper
container_name: zookeeper
ports:
- "2181:2181"
kafka:
image: wurstmeister/kafka
depends_on:
- zookeeper
container_name: kafka
por
docker container ls --filter label=com.docker.compose.project
$ base='{{.Status}}\t{{.ID}}\t{{.Names}}\t{{.Image}}\t{{.Ports}}\t{{.Networks}}\t{{.Mounts}}'
$ compose='{{.Label "com.docker.compose.project"}}\t{{.Lab
mkdir config
echo foobar > config/config.txt
chown -R 1001:1001 config
kafka:
image: docker.io/bitnami/kafka:3
ports:
- "9092:9092"
volumes:
- "./config:/bitnami/kafka/config"
version: '3'
services:
zookeeper:
image: wurstmeister/zookeeper
kafka-1:
image: wurstmeister/kafka
depends_on: [zookeeper]
ports:
- "9092:9092"
environment:
KAFKA_BROKER_ID: 1
KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://${
kafka:
image: wurstmeister/kafka
container_name: kafka
hostname: kafka
ports:
- "9092:9092"
environment:
KAFKA_BROKER_ID: 1
KAFKA_ADVERTISED_PORT: 9092
KAFKA_ADVERTISED_HOST_NAME: kafka
K
version: '3.8'
services:
zookeeper:
image: confluentinc/cp-zookeeper:7.0.0
hostname: zookeeper
container_name: zookeeper
ports:
- "2181:2181"
environment:
ZOOKEEPER_CLIENT_PORT: 2181
ZOOKEEPER_TICK_T
Community Discussions
Trending Discussions on zookeeper
QUESTION
I am following this tutorial: https://towardsdatascience.com/kafka-docker-python-408baf0e1088 in order to run a producer-consumer example using Kafka, Docker and Python. My problem is that my terminal prints the iterations of the producer, while it does not print the iterations of consumer. I am running this example in local, so:
- in one terminal tab I have done:
docker-compose -f docker-compose-expose.yml up
where my docker-compose-expose.yml is this:
ANSWER
Answered 2022-Mar-26 at 12:23Basically I had understood that the problem was in some images/processes that were in execution. With docker-compose stop
and docker-compose rm -f
I solved.
QUESTION
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
...ANSWER
Answered 2021-Dec-09 at 15:51Known 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.
QUESTION
I am new to kafka and zookepper, and I am trying to create a topic, but I am getting this error -
...ANSWER
Answered 2021-Sep-30 at 14:52Read 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.
QUESTION
We are currently running an unsecured Kafka setup on AWS MSK (so I don't have access to most config files directly and need to use the kafka-cli) and are looking into ways to add protection. Setting up TLS & SASL is easy, though as our Kafka cluster is behind a VPN and already has restricted access does not add more security.
We want to start with the most important and in our opinion quick win security addition. Protect topics from being deleted (and created) by all users.
We currently have allow.everyone.if.no.acl.found
set to true
.
All I find on Google or Stack Overflow shows me how I can restrict users from reading/writing to other topics than they have access to. Though Ideally that is not what we want to implement as a first step.
I have found things about a root-user (Is an admin user, though was called root in all tutorials I read). Though the examples I have found don't show examples of adding an ACL to this root user to make it the only one accessible, the topic deletion/creation.
Can you please explain how to create a user that, and block all other users?
By the way, we also don't use zookeeper, even though an MSK-cluster ads this per default. And hope we can do this without adding zookeeper actively to our stack. The answer given here hardly relies on zookeeper. Also, this answer points to the topic read/write examples only, even though the question was the same as I am asking
...ANSWER
Answered 2021-Dec-21 at 10:11I'd like to start with a disclaimer that I'm personally not familiar with AWS MSK offering in great detail so this answer is largely based on my understanding of the open source distribution of Apache Kafka.
First - The Kafka ACLs are actually stored in Zookeeper by default so if you're not using Zookeeper, it might be worth adding this if you're not using it.
Reference - Kafka Definitive Guide - 2nd edition - Chapter 11 - Securing Kafka - Page 294
Second - If you're using SASL for authentication through any of the supported mechanisms such as GSSAPI (Kerberos), then you'll need to create a principal as you would normally create one and use one of the following options:
Add the required permissions for topic creation/deletion etc. using the
kafka-acls
command (Command Reference)bin/kafka-acls.sh --add --cluster --operation Create --authorizer-properties zookeeper.connect=localhost:2181 --allow-principal User:admin
Note -
admin
is the assumed principal nameOr add
admin
user to the super users list inserver.properties
file by adding the following line so it has unrestricted access on all resourcessuper.users=User:Admin
Any more users can be added in the same line delimited by
;
.
To add the strictness, you'll need to set allow.everyone.if.no.acl.found
to false
so any access to any resources is only granted by explicitly adding these permissions.
Third - As you've asked specifically about your root
user, I'm assuming you're referring to the linux root here. You could just restrict the linux level permissions using chmod
command for the kafka-acls.sh
script but that is quite a crude way of achieving what you need. I'm also not entirely sure if this is doable in MSK or not.
QUESTION
I am a kafka and flink beginner.
I have implemented FlinkKafkaConsumer
to consume messages from a kafka-topic. The only custom setting other than "group" and "topic" is (ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest")
to enable re-reading the same messages several times. It works out of the box for consuming and logic.
Now FlinkKafkaConsumer
is deprecated, and i wanted to change to the successor KafkaSource
.
Initializing KafkaSource
with the same parameters as i do FlinkKafkaConsumer
produces a read of the topic as expected, i can verify this by printing the stream. De-serialization and timestamps seem to work fine. However execution of windows are not done, and as such no results are produced.
I assume some default setting(s) in KafkaSource
are different from that of FlinkKafkaConsumer
, but i have no idea what they might be.
KafkaSource - Not working
...ANSWER
Answered 2021-Nov-24 at 18:39Update: The answer is that the KafkaSource behaves differently than FlinkKafkaConsumer in the case where the number of Kafka partitions is smaller than the parallelism of Flink's kafka source operator. See https://stackoverflow.com/a/70101290/2000823 for details.
Original answer:
The problem is almost certainly something related to the timestamps and watermarks.
To verify that timestamps and watermarks are the problem, you could do a quick experiment where you replace the 3-hour-long event time sliding windows with short processing time tumbling windows.
In general it is preferred (but not required) to have the KafkaSource do the watermarking. Using forMonotonousTimestamps
in a watermark generator applied after the source, as you are doing now, is a risky move. This will only work correctly if the timestamps in all of the partitions being consumed by each parallel instance of the source are processed in order. If more than one Kafka partition is assigned to any of the KafkaSource tasks, this isn't going to happen. On the other hand, if you supply the forMonotonousTimestamps
watermarking strategy in the fromSource call (rather than noWatermarks
), then all that will be required is that the timestamps be in order on a per-partition basis, which I imagine is the case.
As troubling as that is, it's probably not enough to explain why the windows don't produce any results. Another possible root cause is that the test data set doesn't include any events with timestamps after the first window, so that window never closes.
Do you have a sink? If not, that would explain things.
You can use the Flink dashboard to help debug this. Look to see if the watermarks are advancing in the window tasks. Turn on checkpointing, and then look to see how much state the window task has -- it should have some non-zero amount of state.
QUESTION
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
ANSWER
Answered 2021-Nov-03 at 19:11We 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.
QUESTION
Has anyone managed to access HBase running as a service on Amazon EMR cluster with Athena? I'm trying to establish a connection to the HBase instance, but the lambda (provided with Athena java function) fails with the following error:
...ANSWER
Answered 2021-Sep-10 at 08:52Finally, the solution for the issue is to create appropriate dns records for each cluster ec2 instance with the necessary names inside Amazon Route53 service.
QUESTION
I have the following output from the following command
...ANSWER
Answered 2021-Sep-02 at 17:28With your shown samples, attempts please try following awk
code. Since I don't have zookeeper command with me, I had written this code and tested it as per your shown output only.
QUESTION
This is my docker compose file:
...ANSWER
Answered 2021-Aug-30 at 00:39You've forwarded the wrong port
9093 on the host needs to map to the localhost:9093
advertised port
Otherwise, you're connecting to 9093, which returns kafka:9092
, as explained in the blog. Container hostnames cannot be resolved by the host, by default
QUESTION
I am trying to automate my ECS fargate cluster making using terraform.
I have a SpringBoot project with microservices containerized, and I am putting these images in a single task definition for an ECS service for the backend.
The ECS cluster is initially running, but Kafka is getting stopped with the error :
...ANSWER
Answered 2021-Aug-22 at 17:28AS written in the documentation:
Additionally, containers that belong to the same task can communicate over the localhost interface.
So my suggestion is to use localhost instead of the service names. For example, you want to do it for Kafka but also for every other service, such as the email service.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install zookeeper
You can use zookeeper 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 zookeeper 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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