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Thanks all.

I was using an older Kafka version.

I upgraded Kafka in the cluster from kafka_2.12-1.1.0 to the latest stable version kafka_2.12-2.7.0. I also upgraded zookeeper from zookeeper-3.4.6 to apache-zookeeper-3.6.2-bin version.

In addition in the run file I added the following:

I do something similar, when I need to create my own plugin to Kafka Connect but I don't exactly do it as root. Simply I put my jars in a place I have permission to write and just configure the plugins Environment Setting

something like this:

I would love to help you but could you share the error you get in the Chrome console log?

Usually, the problem is that you are using firestore and others but did not include them in the index.html.

For example:

I found a solution. I edited all_payments.php script as below:

In my production.rb I needed to remove this configuration line:

try return repository.findAll();

Obviously, schema IDs in the schema registry are always > 0... It looks like KSQL is encoding the message with schema ID 0, but we're unable to find the cause for that

The AvroConverter does a "dumb check" that only looks that the consumed bytes start with a magic byte of 0x0. The next 4 bytes are the ID.

If you are using key.converter=AvroConverter and your keys start like 0x00000 in hex, then the ID would be shown as 0 in the logs, and the lookup would fail.

Last I checked, KSQL doesn't output keys in Avro format, so you will want to check the properties of your connector.

Either upgrade your local installation of Gradle by installing a new version. Or upgrade the Gradle wrapper: https://docs.gradle.org/current/userguide/gradle_wrapper.html#sec:upgrading_wrapper

Value of property tasks.max depends on several factors. Most important one is particular connector. Particular Connector depends on its logic and value of tasks.max calculate number of Task, that will be created. ex. FileStreamSourceConnector always create 1 Task, so even if you pass value higher then 1 it will create only one. Same situation is with PostgresConnector it parallel to one.

tasks.max value should also depends on other factors, like: Kafka Connect mode, How many instance of Kafka Connect you have, CPU of machines etc.

How I understand you are using SourceConnector (PostgresConnector). Source Connectors don't poll data from the Kafka. Exception, that you have posted relates to some SinkConnector. If use are using SinkConnector your tasks.max shouldn't exceed number of partitions. If you start more Tasks than the number of partitions some will be idle (status is running, but they don't process data) and rebalancing can occur.