I wanted to install the Apache Kafka but stuck in installing the Zookeeper
I extracted all the file and created the environment variables as well and now it stopped working after
"Zookeeper audit is disabled."
Now after following through these links,
https://www.programmersought.com/article/22066571206/
https://zookeeper.apache.org/doc/r3.6.2/zookeeperAuditLogs.html
I updated both the files (skServer.cmd and conf/zoo.cfg). Adder a line "-Dzookeeper.audit.enable=true" in skServer.cmd file and "audit.enable=true" in conf/zoo.cfg.
Now the output has changed to "Zookeeper audit is Enabled." but still it doesn't do anything and stops there like before.
Output after running the zkServer command with files edited
Even tried changing one file at a time but the same output and still stops working.
Can anyone help me understand the problem and provide a solution as well?
Thank you so much.
zookeeper-server-start or zkServer.cmd do not return, by design. It's tailing the logs and waiting for a client connection
You must start a second terminal to run the Kafka broker, as mentioned in the Kafka documentation
Kill all java services.
In Linux run killall -9 java
Re re-run the zookeeper and Kafka server.
It works
Related
I'm trying to run this command : confluent local services start
I don't know why each time it gives me an error before passing to the next step. So I had to run it again over and over until it passes all the steps.
what is the reason for the error and how to solve the problem?
You need to open the log files to inspect any errors that would be happening.
But, it's possible the services are having a race condition. Schema Registry requires Kafka, REST Proxy and Connect require the Schema Registry... Maybe they are not waiting for the previous components to start.
Or maybe your machine does not have enough resources to start all services. E.g. I believe at least 6GB of RAM are necessary. If you have 8GB on the machine, and Chrome and lots of other services are running, for example, then you wouldn't have 6GB readily available.
I am seeing various different issues while trying to start Kafka services on wsl2. Details/symptoms below:
Confluent Kafka (7.0.0) platform
wsl2 - ubuntu 20.04LTS
When I use the command:
confluent local services start
Typically the system will take a long time and then exit with service failed (e.g. zookeeper, as that is the first service to start).
If I check the logs, it is actually started. So I again type the command and sure enough it immediately says zookeeper up, then proceed to try start kafka, which again after a min will say failed to start (but it really has started).
I suspect after starting the service (which is quite fast), system is not able to communicate back/exit and thus times out, I am not sure where the logs related to this are.
Can see this in the screenshot below
This means to start the whole stack (zookeeper/kafka/schema-registry/kafka-rest/kafka-connect/etc), takes forever, and in between I start getting other errors (sometimes, schema-registry is not able to find the cluster id, sometimes its a log file related error), which means I need to destroy and start again.
I have tried this over a couple of days and cant get this to work. Is confluent kafka that unstable on windows or I am missing some config change.
In terms of setup, I have not done any change in the config and am using the default config/ports.
I see many docs and posts about how to send logs to Stackdriver but almost no information about how to do the opposite - send logs from the Stackdriver to Kafka.
In my case, our Ops want to collect the logs from our web servers using Google's stackdriver agents and pushing them to stackdriver ... However, for my stream processing needs I want to get the logs into Kafka to use it's unparalleled abilities to retain and reprocess data by any number of consumers, something that I cannot do with PubSub.
So, what are the options for doing this? I only saw a couple of possible avenues - neither sounds too good:
based on this post: (https://powerspace.tech/how-to-stream-data-from-google-pubsub-to-kafka-with-kafka-connect-dbef1c340a76) push data into PubSub first, and then read from it using either Kafka connector or write my own Kafka consumer. I hate the thought of adding yet another hop (serialize/deserialize/ack/etc.) between the source of data and Kafka ....
I noticed a brief mentioning in passing on adding a plugin to Google's version of Fluentd (which is what stackdriver log collection agent is based on) here: https://powerspace.tech/how-to-stream-data-from-google-pubsub-to-kafka-with-kafka-connect-dbef1c340a76 . Not many details - so hard to tell how involved this approach is ...
Any other options?
Thank you!
Enter in to the Kafka console and add certain elements in the console. Once you have added the elements in the Kafka console you need to check if these elements are reflected successfully in the cloud shell. For this you will run the command > $ gcloud pubsub subscriptions pull from-kafka — auto-ack — limit=10 < . Once you run this command it will take some time to sync with the Kafka console. You will get the results after running this command a couple of times.
You will run the commands in the Cloud Shell and see the output in the Kafka VM SSH.
***Image1
Now you will be verifying the exact opposite procedure where in you will be running the command in the Kafka VM and seeing the output in the Cloud Shell. It will take some time for the output to be reflected and you may have to run the command > $ gcloud pubsub subscriptions pull from-kafka — auto-ack — limit=10 < a couple of times to see the output. Your output will look like this
*** image2
The Kafka plugin is deprecated. For more information, refer to https://cloud.google.com/stackdriver/docs/deprecations
Note: This functionality is only available for agents running on Linux. It is not available on Windows.
Kafka is monitored via JMX. Monitoring supports monitoring Kafka version 0.8.2 and higher.
On your VM instance, download kafka-082.conf from the GitHub configuration repository and place it in the directory /etc/stackdriver/collectd.d/:
(cd /etc/stackdriver/collectd.d/ && sudo curl -O https://raw.githubusercontent.com/Stackdriver/stackdriver-agent-service-configs/master/etc/collectd.d/kafka-082.conf)
The downloaded plugin configuration file assumes that your Kafka server is configured to accept JMX connections on port 9999. If you have configured Kafka with a different JMX port, as root, edit the file and follow the instructions to change the JMX port settings.
After adding the configuration file, restart the Monitoring agent by running the following command:
sudo service stackdriver-agent restart
What is monitored:
https://cloud.google.com/monitoring/api/metrics_agent#agent-kafka
I am following a quick start guide for getting kafka up and running.
I have zookeeper running but when I try to start kafka server with the following command:
.\bin\windows\kafka-server-start.bat .\config\server.properties
I get the following error
\Teradata\Client\16.20\bin\ was unexpected at this time.
I cant even begin to understand how the two might be related.
Any tip is appreciated. I am very much stuck....
In my case I needed to change the CLASSPATH environment variable, changing from Program Files to Progra~1 and Program Files (x86) to Progra~2
This solved the problem.
This isn't specific to Kafka or Zookeeper, but how they load the Java Home and classpath.
You need to fix your PATH variable in Windows settings to not contain any spaces
looks like the kafka process needs all environment variables in the CLASSPATH to be present. I was getting the same error for Meld which I had deleted but CLASSPATH still have a reference to that.
Removing it from the CLASSPATH worked.
If you are using the Apache Kafka package structure as it is, then fix the path.it will be resolved automatically.
downloaded apache Kafka folder structure kafka_2.11-0.9.0.0 ->bin->windows-> All *.bat files.
kafka_2.11-0.9.0.0->config-> all *.properties files
so to start zookeeper go to the kafka_2.11-0.9.0.0 ->bin->windows->in window address bar type cmd and enter after that enter:
zookeeper-server-start.bat ..\..\config/zookeeper.properties
o/p: zookeeper will start working
To start broker again go to the same folder
kafka_2.11-0.9.0.0 ->bin->windows->in window address bar type cmd and enter after that enter:
kafka-server-start.bat ..\..\config/server.properties
o/p: broker will start working.
Note: you can update your own configuration using this properties file.like change in port etc..
I can't even begin to understand how the two might be related.<br/>
For more information, you can check the blog: Role of Apache ZooKeeper in Kafka — Monitoring & Configuration
I am working with Apache Kafka and using distributed worker. I can start my worker as below:
// Command to start the distributed worker.
"bin/connect-distributed.sh config/connect-distributed.properties"
This is from official documentation. After this we can create connectors and tasks. And this works fine.
But when i change my connector or task logic I should add new jar to classpath of kafka. And after this I should restart worker.
I don't know how it should be right I think we should stop and run worker.
But when I want to stop worker I don't know how i can do it correctly.
ofcourse, I can find my process by ps aux | grep worker, kill it and kill rest server which i should find by ps too. But i think it's strange case. Killing two processes isn't good idea, but i can't find any information how we can do it in another way.
If you know right way, please help me:)
Thanks for your time.
Killing two processes isn't good idea
ConnectDistributed is only one process. There is no separate REST server to stop.
And yes, :connector/pause followed by a kill <pid> is the correct way to stop it.
If installed with a recent version of Confluent Platform, you can stop/start using systemctl.