kafka | Load-balancing resuming Kafka consumer for go | Pub Sub library

 by   wvanbergen Go Version: Current License: MIT

kandi X-RAY | kafka Summary

kandi X-RAY | kafka Summary

kafka is a Go library typically used in Messaging, Pub Sub, Kafka applications. kafka has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Kafka libraries, tools and example applications built on top of the sarama package.
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            kandi-support Support

              kafka has a low active ecosystem.
              It has 368 star(s) with 136 fork(s). There are 33 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 20 open issues and 33 have been closed. On average issues are closed in 59 days. There are 7 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of kafka is current.

            kandi-Quality Quality

              kafka has no bugs reported.

            kandi-Security Security

              kafka has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              kafka is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              kafka releases are not available. You will need to build from source code and install.

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            kafka Key Features

            No Key Features are available at this moment for kafka.

            kafka Examples and Code Snippets

            No Code Snippets are available at this moment for kafka.

            Community Discussions

            QUESTION

            SpringBoot batch listener mode vs non-batch listener mode
            Asked 2021-Jun-15 at 20:19

            I am just curious does batch listener mode in Spring Kafka gives better performance than non-batch listener mode? If we are handling exceptions then we still need to process each record in Batch-listener mode. Non-batch seems less error prone, stable and customizable .

            Please share your views on this as I didn't find any good comparison.

            ...

            ANSWER

            Answered 2021-Jun-15 at 20:19

            It completely depends on what your listener is doing with the data.

            If it processes each record in a loop then there is no benefit; you might as well just let the container iterate over the collection and send the listener one record at-a-time.

            Batch mode will improve performance if you are processing the batch as a whole - e.g. a batch insert using JDBC in a single transaction.

            This will often run much faster than storing one record at-a-time (using a new transaction for each record) because it requires fewer round trips to the DB server.

            Source https://stackoverflow.com/questions/67992900

            QUESTION

            Spring Boot BatchAcknowledgingMessageListener Splitting Message on Commas
            Asked 2021-Jun-15 at 17:49

            I have a Spring Boot app with a Kafka Listener implementing the BatchAcknowledgingMessageListener interface. When I receive what should be a single message from the topic, it's actually one message for each line in the original message, and I can't cast the message to a ConsumerRecord.

            The code producing the record looks like this:

            ...

            ANSWER

            Answered 2021-Jun-15 at 17:48

            You are missing the listener type configuration so the default conversion service sees you want a list and splits the string by commas.

            Source https://stackoverflow.com/questions/67990755

            QUESTION

            Error handling in SpringBoot kafka in Batch mode
            Asked 2021-Jun-15 at 17:34

            I am trying to figure out is there any way to send failed records in Dead Letter topic in Spring Boot Kafka in Batch mode. I don't want to make the records being sent in duplicate as it's consuming in batch and few are already processed. I saw this link ofspring-kafka consumer batch error handling with spring boot version 2.3.7

            I thought about a use case to stop container and start again without using DLT but again the issue of duplication will come in Batch mode.

            @Garry Russel can you please provide a small code for batch error handling.

            ...

            ANSWER

            Answered 2021-Jun-15 at 17:34

            The RetryingBatchErrorHandler was added in spring-kafka version 2.5 (which comes with Boot 2.3).

            The listener must throw an exception to indicate which record in the batch failed (either the complete record, or the index in the list).

            Offsets for the records before the failed one are committed and the failed record can be retried and/or sent to the dead letter topic.

            See https://docs.spring.io/spring-kafka/docs/current/reference/html/#recovering-batch-eh

            There is a small example there.

            The RetryingBatchErrorHandler was added in 2.3.7, but it sends the entire batch to the dead letter topic, which is typically not what you want (hence we added the RetryingBatchErrorHandler).

            Source https://stackoverflow.com/questions/67990222

            QUESTION

            Spring Kafka Consumer with database
            Asked 2021-Jun-15 at 14:05

            How can I execute the below in a transaction. My requirement is message offset should not be committed to Kafka if the DB calls fails .Kafka consumer configuration is here https://pastebin.com/kq5S9Jrx

            ...

            ANSWER

            Answered 2021-Jun-15 at 13:38

            QUESTION

            using multiple different kafka cluster within one app
            Asked 2021-Jun-15 at 13:28

            This probably ins't typical setup, but due to higher decisions we endup having multiple kafka clusters within one app, multiple topics per each, and each might have different serializing strategy. Json/avro. And avro might be with confluent schema registry or using single object encoding.

            Well I got it working somehow, by building my own abstractions and registry which analyzes the configuration and creates most of stuff manually, but I feel I needed to repeat stuff like topic names, schema registry url on several places multiple times just to create all needed beans. Ugly as hell.

            I'd like to ask, if there is some better way and support for this I just might have overlooked.

            I need to create N representations of kafka clusters, configuring it once. Configure topics respective to given kafka cluster, configure confluent schema registry for topics where applicable etc, so that I can create instance of Avro schema file, send it to KafkaTemplate and it will work.

            ...

            ANSWER

            Answered 2021-Jun-15 at 13:28

            It depends on the complexity and how much different the configurations are, as to whether this will help, but you can override individual Kafka properties (such as bootstrap servers, deserializers, etc on the @KafkaListener and in each KafkaTemplate.

            e.g.

            Source https://stackoverflow.com/questions/67959209

            QUESTION

            Is it safe to delete the cleaner-offset-checkpoint file to force the compaction?
            Asked 2021-Jun-15 at 13:24

            I need a way to force the compaction of the __consumer_offsets topic. In a test environment I tried to delete the file cleaner-offset-checkpoint and then kafka deleted many segments as you can see below. Is it safe to delete this file in a production environment?

            Before removing cleaner-offset-checkpoint:

            ...

            ANSWER

            Answered 2021-Jun-15 at 13:24

            cleaner-offset-checkpoint is in kafka logs directory. This file keeps the last cleaned offset of the topic partitions in the broker like below.

            Source https://stackoverflow.com/questions/67982650

            QUESTION

            sed or Perl one liner + how to replace path in file only when full match
            Asked 2021-Jun-15 at 06:45

            We want to replace the path on /etc/fstab file from

            ...

            ANSWER

            Answered 2021-Jun-15 at 06:45

            The following 'awk' could assist you here

            Source https://stackoverflow.com/questions/67970972

            QUESTION

            I can't pass parameters to foreach loop while implementing Structured Streaming + Kafka in Spark SQL
            Asked 2021-Jun-15 at 04:42

            I followed the instructions at Structured Streaming + Kafka and built a program that receives data streams sent from kafka as input, when I receive the data stream I want to pass it to SparkSession variable to do some query work with Spark SQL, so I extend the ForeachWriter class again as follows:

            ...

            ANSWER

            Answered 2021-Jun-15 at 04:42

            do some query work with Spark SQL

            You wouldn't use a ForEachWriter for that

            Source https://stackoverflow.com/questions/67972167

            QUESTION

            Additional unique index referencing columns not exposed by CDC causes exception
            Asked 2021-Jun-14 at 17:35

            I am using the SQL connector to capture CDC on a table that we only expose a subset of all columns on the table. The table has two unique indexes A & B on it. Neither index is marked as the PRIMARY INDEX but index A is logically the primary key in our product and what I want to use with the connector. Index B references a column we don't expose to CDC. Index B isn't truly used in our product as a unique key for the table and it is only marked UNIQUE as it is known to be unique and marking it gives us a performance benefit.

            This seems to be resulting in the error below. I've tried using the message.key.columns option on the connector to specify index A as the key for this table and hopefully ignore index B. However, the connector seems to still want to do something with index B

            1. How can I work around this situation?
            2. For my own understanding, why does the connector care about indexes that reference columns not exposed by CDC?
            3. For my own understanding, why does the connector care about any index besides what is configured on the CDC table i.e. see CDC.change_tables.index_name documentation
            ...

            ANSWER

            Answered 2021-Jun-14 at 17:35

            One of the contributors to Debezium seems to affirm this is a product bug https://gitter.im/debezium/user?at=60b8e96778e1d6477d7f40b5. I have created an issue https://issues.redhat.com/browse/DBZ-3597.

            Edit:

            A PR was published and approved to fix the issue. The fix is in the current 1.6 beta snapshot build.

            There is a possible workaround. The names of indices are the key to the problem. It seems they are processed in alphabetical order. Only the first one is taken into consideration so if you can rename your indices to have the one with keys first then you should get unblocked.

            Source https://stackoverflow.com/questions/67823515

            QUESTION

            How to inject ObjectMapper bean in Spring Kafka JsonSerializer?
            Asked 2021-Jun-14 at 14:35

            spring-kafka creates a ValueSerializer instance in the AbstractConfig class using a no-args constructor.

            I can see that JsonSerializer has an ObjectMapper constructor which I would like to use to inject a preconfigured ObjectMapper bean.

            The default ObjectMapper includes null values in the response which I would like to remove. I added spring.jackson.default-property-inclusion: NON_EMPTY to my properties.yml but since Spring creates a default instance, this does not help me.

            Could someone point me in the right direction?

            ...

            ANSWER

            Answered 2021-Jun-14 at 14:16

            I think you are on the right lines but ay have set the property incorrectly. I think you wanted

            Source https://stackoverflow.com/questions/67970794

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

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