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APACHE-KAFKA QUESTIONS

Kafka Consumer API jumping offsets
Kafka Consumer API jumping offsets
around this issue There seems to be a problem with usage of subscribe() here.Subscribe is used to subscribe to topics and not to partitions. To use specific partitions you need to use assign(). Read up the extract from the documentation:
TAG : apache-kafka
Date : October 21 2020, 06:10 AM , By : Arjay Demana
What are internal topics used in Kafka?
What are internal topics used in Kafka?
I hope this helps . There are several types of internal Kafka topics: __consumer_offsets is used to store offset commits per topic/partition. __transaction_state is used to keep state for Kafka producers and consumers using transactional semantics. _
TAG : apache-kafka
Date : October 20 2020, 06:10 PM , By : Raymond Fang
I want to load the multiple Kafka messages to multiple HDFS folders in Nifi
I want to load the multiple Kafka messages to multiple HDFS folders in Nifi
I wish did fix the issue. The ConsumeKafkaRecord processor writes an attribute named kafka.topic that contains the name of the topic where records are from.And the directory parameter of PutHDFS supports expression language.
TAG : apache-kafka
Date : October 16 2020, 06:10 PM , By : Alex Sơn
Connection to node -1 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
Connection to node -1 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
like below fixes the issue Open Server.xml of each broker of your cluster and make following changesChange the listeners=PLAINTEXT://:9092 to listeners=PLAINTEXT://:9092
TAG : apache-kafka
Date : October 14 2020, 02:00 PM , By : Dongjin Baek
Which Queue to use? Kafka, RabbitMQ, Redis, SQS, ActiveMQ or you name it
Which Queue to use? Kafka, RabbitMQ, Redis, SQS, ActiveMQ or you name it
wish of those help All of these and then, none.The service that reads from your queue and talks to the API should be the one responsible for keeping track of the API call rate and slow down (by waiting) when the rate is exceeded.
TAG : apache-kafka
Date : October 13 2020, 09:00 PM , By : albiejames
Comparing IBM MQ to Kafka
Comparing IBM MQ to Kafka
like below fixes the issue It's very difficult to reduce a comparison of MQ and Kafka to a few bullet points. From my point of view, each has use cases which suit it particularly well. They both scale, but in different ways. They're both secure, but
TAG : apache-kafka
Date : October 13 2020, 09:00 AM , By : Romeo Tidze
KafkaStreams adding more than 1 processor in Topology not working
KafkaStreams adding more than 1 processor in Topology not working
I hope this helps you . To pass record forward in Processor you have to call ProcessorContext::forward. This method is overloaded. You can forward all message to all following nodes, but you can also choose subset of nodes to which message will be fo
TAG : apache-kafka
Date : October 13 2020, 05:00 AM , By : 2Love
Does Kafka guarantee zero message loss?
Does Kafka guarantee zero message loss?
To fix the issue you can do Every topic, is a particular stream of data (similar to a table in a database). Topics, are split into partitions (as many as you like) where each message within a partition gets an incremental id, known as offset as shown
TAG : apache-kafka
Date : October 13 2020, 01:00 AM , By : Александър Бояджиев
Why enable Record Caches In Kafka Streams Processor API if RocksDB is buffered in memory?
Why enable Record Caches In Kafka Streams Processor API if RocksDB is buffered in memory?
like below fixes the issue Your observation is correct and it depends on the use case if caching is desired on not. One big advantage of application level caching (instead of RocksDB caching) is that it reduces the number of records written into the
TAG : apache-kafka
Date : October 12 2020, 09:00 PM , By : Liang Liheng
Kafka ignoring `transaction.timeout.ms` for producer
Kafka ignoring `transaction.timeout.ms` for producer
wish helps you In the course of writing the question I found the answer. Broker is configured to check timed out producers every 60 seconds, so the transaction is aborted at next check. This property configures it: transaction.abort.timed.out.transac
TAG : apache-kafka
Date : October 12 2020, 06:00 AM , By : Blanka
How to run Kafka Connect connectors automatically (e.g. in production)?
How to run Kafka Connect connectors automatically (e.g. in production)?
I hope this helps you . Normally, you'd have to use the REST API when running Kafka Connect in distributed mode. However, you can use docker compose to script the creation of connectors; @Robin Moffatt has written a nice article about this:
TAG : apache-kafka
Date : October 12 2020, 04:00 AM , By : rvaquerizo
Where does kafka store offsets of internal topics?
Where does kafka store offsets of internal topics?
With these it helps The term "internal topic" has two different meanings in Kafka: Brokers: an internal topic is a topic that the cluster uses (like __consumer_offsets). A client cannot read/write from/to this topic. Kafka Streams: topics that Kafka
TAG : apache-kafka
Date : October 12 2020, 01:00 AM , By : Silvio
Unfair Leader election in Kafka - Same leader for all partitions
Unfair Leader election in Kafka - Same leader for all partitions
I wish this help you Kafka has the concept of a preferred leader, meaning that if possible it will elect that replica to serve as the leader. The first replica listed in the replicas list is the preferred leader. Now looking at the current cluster st
TAG : apache-kafka
Date : October 11 2020, 09:00 PM , By : Fencerx
Handling a Large Kafka topic
Handling a Large Kafka topic
wish of those help You should define "large" when mentioning Kafka topics: Large means huge data in terms of volume size. Message size is large that it takes time sending a message from queue to client for processing? Intensive write to that topic? I
TAG : apache-kafka
Date : October 11 2020, 03:00 PM , By : Jonas Pucher
Is kafka stream library dependent on underlying kafka broker?
Is kafka stream library dependent on underlying kafka broker?
Hope this helps Is it possible to use kafka stream 2.2 version of library against kafka broker 2.12-1.1.1 ?
TAG : apache-kafka
Date : October 11 2020, 10:00 AM , By : Isaiah Paradiso
Maximum value for fetch.max.bytes
Maximum value for fetch.max.bytes
hope this fix your issue You can not use any value greater than 2147483647. This is not a restriction on Kafka side though. You can see from the source code that the configuration parameter FETCH_MAX_BYTES_CONFIG is of type Type.INT which means that
TAG : apache-kafka
Date : October 11 2020, 07:00 AM , By : asdiqa
How to test(Integration tests) springboot-kafka microservices
How to test(Integration tests) springboot-kafka microservices
help you fix your problem I have Spring-boot Kafka pub sub microserivces as shows in the figure. I want to do Integration tests for each of my apps. , How to know something was published to topic Y
TAG : apache-kafka
Date : October 10 2020, 08:00 PM , By : Sungjin.Kim
Hardware requirement for apache kafka
Hardware requirement for apache kafka
it should still fix some issue You would need to provide some more details regarding your use-case like average size of messages etc. but here's my 2 cents anyway: Confluent's documentation might shed some light:
TAG : apache-kafka
Date : October 10 2020, 04:00 PM , By : Gustavo Fernandes
Event sourcing - why a dedicated event store?
Event sourcing - why a dedicated event store?
fixed the issue. Will look into that further Much of the literature on event-sourcing and cqrs comes from the [domain driven design] community; in its earliest form, CQRS was called DDDD... Distributed domain driven design.One of the common patterns
TAG : apache-kafka
Date : October 10 2020, 11:00 AM , By : Nicolas Lellouche
Re-processing/reading Kafka records/messages again - What is the purpose of Consumer Group Offset Reset?
Re-processing/reading Kafka records/messages again - What is the purpose of Consumer Group Offset Reset?
may help you . Handling Kafka consumer offsets is bit more tricky. Consumer program uses auto.offset.reset config only when consumer group used does not have a valid offset committed in an internal Kafka topic.(Other supported offset storage is Zooke
TAG : apache-kafka
Date : October 10 2020, 02:00 AM , By : John Duprey
How to fix kafka.common.errors.TimeoutException: Expiring 1 record(s) xxx ms has passed since batch creation plus linger
How to fix kafka.common.errors.TimeoutException: Expiring 1 record(s) xxx ms has passed since batch creation plus linger
hope this fix your issue The error indicates that some records are put into the queue at a faster rate than they can be sent from the client.When your Producer sends messages, they are stored in buffer (before sending them to the target broker) and t
TAG : apache-kafka
Date : October 09 2020, 10:00 PM , By : Ludeo
Can not consume messages from Kafka cluster
Can not consume messages from Kafka cluster
will help you Add the other broker address as well in the kafka-console-consumer and check.You are probably not consuming from the leader replica, try
TAG : apache-kafka
Date : October 09 2020, 07:00 PM , By : JKNetDesign
Parsing Kafka messages
Parsing Kafka messages
this one helps. In the beginning you say "filter data", so, looks like you need a RecordFilterStrategy injected into the AbstractKafkaListenerContainerFactory. See documentation for this matter: https://docs.spring.io/spring-kafka/docs/current/refere
TAG : apache-kafka
Date : October 09 2020, 03:00 AM , By : JC17800
Kafka consume from 2 topics and take equal number of messages
Kafka consume from 2 topics and take equal number of messages
I hope this helps . With Spring, create 2 @KafkaListeners, one for A, one for B; set the container ack mode to MANUAL and add the Acknowledgment to the method signature.In each listener, accumulate records until you get 50 then pause the listener con
TAG : apache-kafka
Date : October 09 2020, 12:00 AM , By : Gabriel Garrido
Update Kafka 1 to Kafka 2
Update Kafka 1 to Kafka 2
I think the issue was by ths following , Although it is not the best practise, you can have brokers with different version in the same cluster. You'd have to configure inter.broker.protocol.version accordingly:
TAG : apache-kafka
Date : October 08 2020, 08:00 PM , By : J.L
When do Kafka consumer retries happen?
When do Kafka consumer retries happen?
I hope this helps . Kafka Producer consists of a pool of buffer space that holds records that haven't yet been transmitted to the server as well as a background I/O thread that is responsible for turning these batch records into requests and transmit
TAG : apache-kafka
Date : October 08 2020, 12:00 AM , By : Siya
KSQL create stream from JSON fields with periods (`.` dot notation)
KSQL create stream from JSON fields with periods (`.` dot notation)
will be helpful for those in need I've got this answered in slack community by ksql developers. Might help someone. KSQL doesn't have official support for the same but a workaround is to escape the period. With ksql v5.3.0 installed from here.
TAG : apache-kafka
Date : October 07 2020, 11:00 PM , By : seaCucumber
Kafka connect integration with multiple Message Queues
Kafka connect integration with multiple Message Queues
this one helps. Although you haven't provided any further requirements (for example, how frequently are you planning to add new data sources and that traffic do you have), I would pick the first approach. It will be much easier in the future to add/r
TAG : apache-kafka
Date : October 07 2020, 10:00 PM , By : gunjali
kafka asynchronous send not really asynchronous?
kafka asynchronous send not really asynchronous?
it fixes the issue your analysis is correct - kafka has a (sometimes) blocking "non-blocking" API. this has been brought up before - https://cwiki.apache.org/confluence/display/KAFKA/KIP-286%3A+producer.send%28%29+should+not+block+on+metadata+update
TAG : apache-kafka
Date : October 07 2020, 05:00 PM , By : Majdi Amari
What is the gain of using kafka-connect over traditional approach?
What is the gain of using kafka-connect over traditional approach?
Hope that helps The first thing is that you have "... to write a simple JDBC program ..." and take care of the logic of writing on both database and Kafka topic. Kafka Connect does that for you and your business application has to write to the databa
TAG : apache-kafka
Date : October 07 2020, 12:00 PM , By : Mete
What,Where is the Use of Kafka Interactive Queries
What,Where is the Use of Kafka Interactive Queries
hop of those help? And we will define Kafka Interactive Queries to aggregate the result.
TAG : apache-kafka
Date : October 07 2020, 06:00 AM , By : Joao Damas
How do co-partitioning ensure that partition from 2 different topics end up assigned to the same Kafka Stream Task?
How do co-partitioning ensure that partition from 2 different topics end up assigned to the same Kafka Stream Task?
will help you The way i understand it is that, we have 2 independent consumer groups, which actually may have the same name, because it is the same kafka stream application, although the suscription to each topic is independent from each other.
TAG : apache-kafka
Date : October 07 2020, 05:00 AM , By : Ulas Bayram
Does min insync replicas property effects consumers in kafka
Does min insync replicas property effects consumers in kafka
this one helps. min.insync.replicas specifies the minimum number of replicas that must acknowledge a write in order to consider this write as successful and therefore, it has an effect on the producer side which is responsible for the writes. This co
TAG : apache-kafka
Date : October 07 2020, 04:00 AM , By : Masanobu Aoyama
How do other messaging systems deal with the problems that Zookeeper in Kafka solves?
How do other messaging systems deal with the problems that Zookeeper in Kafka solves?
Any of those help Zookeeper is used to achieve resource consistency into a distributed system. Apache Kafka relies on Zookeeper for multiple purpose :
TAG : apache-kafka
Date : October 07 2020, 03:00 AM , By : v.sor
Aug 2019 - Kafka Consumer Lag programmatically
Aug 2019 - Kafka Consumer Lag programmatically
With these it helps you can get this using kafka-python, run this on each broker or loop through list of brokers, it will give all topic partitions consumer lag.
TAG : apache-kafka
Date : October 06 2020, 05:00 PM , By : Cody
What is considered to be current and latest state in kafka state stores?
What is considered to be current and latest state in kafka state stores?
it helps some times I'm trying to understand what state should be expected from KTables. , If a message is successfully sent to a topic T.
TAG : apache-kafka
Date : October 06 2020, 02:00 PM , By : MichelleL
How to create kafka consumer group using command line?
How to create kafka consumer group using command line?
seems to work fine You do not need to explicitly "prepare" the Kafka broker to add new consumer groups.Just add the group.id in your Flink consumer, and the broker will automatically detect that this group.id is a new one or if it already exists.
TAG : apache-kafka
Date : October 06 2020, 02:00 PM , By : user6048082
Kafka partitions order of consumption
Kafka partitions order of consumption
it fixes the issue Kafka guarantees the order of messages only within a single partition. The simplest way (not the most efficient one, though) to deal with this, is to create a single partition and run a single consumer.
TAG : apache-kafka
Date : October 05 2020, 02:00 PM , By : Jamie Lipiner
Apache Storm: How to micro batch events from Kafka Spout
Apache Storm: How to micro batch events from Kafka Spout
should help you out Look at Storm's tick tuples which provide a way to send scheduled tuples (ticks) to your bolts. For your case you can configure a tick every second. The bolt, meanwhile, would simply process tuples from the Kafka spout and batch t
TAG : apache-kafka
Date : October 04 2020, 04:00 PM , By : SGT Cuddles
Debezium Connector for RDS Aurora
Debezium Connector for RDS Aurora
like below fixes the issue While creating AWS Aurora instance you must have chosen between Amazon Aurora with MySQL compatibility Amazon Aurora with PostgreSQL compatibility
TAG : apache-kafka
Date : October 04 2020, 05:00 AM , By : ANASWARA
Kafka consumer group not reading from a single partition
Kafka consumer group not reading from a single partition
wish of those help To diagnose the issue you can use kafka-tool.Following command shows partition, current offset, log-end-offset and lag client_id for particular group
TAG : apache-kafka
Date : October 04 2020, 01:00 AM , By : sangeetha
Kafka - Log compaction behavior
Kafka - Log compaction behavior
I wish this helpful for you Only messages that are not in active segment can be consider in compaction process. Even if you set segment.ms= 5000, rolling new log segment can be made when new messages for partition appear.If you send all message at on
TAG : apache-kafka
Date : October 03 2020, 07:00 PM , By : Clau Caron
How to process events which are out of order using Kafka Streams
How to process events which are out of order using Kafka Streams
Does that help If you are not able to preserve order of event (that Logout will be last event), you can achieve your requirements using ProcesorApi from Kafka Streams. Kafka Streams DSL can be combine with Processor API (more details here).You can ha
TAG : apache-kafka
Date : October 03 2020, 04:00 PM , By : Michael Schröter
Confluent platform Kafka Connect crashed with Exit 137
Confluent platform Kafka Connect crashed with Exit 137
hop of those help? Error 137 is indicative of out-of-memory. To run Confluent Platform you must allocate a minimum of 8 GB of Docker memory resource.
TAG : apache-kafka
Date : October 03 2020, 02:00 PM , By : Wraith
KSQL Table-Table Left outer Join emit same join result more than once
KSQL Table-Table Left outer Join emit same join result more than once
Any of those help the general answer is yes. kafka is an at-least-once system. more specifically, a few scenarios can result in duplication: consumers only periodically checkpoint their positions. a consumer crash can result in duplicate processing o
TAG : apache-kafka
Date : October 02 2020, 09:00 PM , By : Leah Cobb
Creating and using a custom kafka connect configuration provider
Creating and using a custom kafka connect configuration provider
I hope this helps . I just went through these to setup a custom ConfigProvider recently. The official doc is ambiguous and confusing.
TAG : apache-kafka
Date : October 02 2020, 06:00 AM , By : Jesse
Receiving Kafka Key in spring boot kafka listener
Receiving Kafka Key in spring boot kafka listener
will be helpful for those in need Please read the documentation.
TAG : apache-kafka
Date : October 01 2020, 11:00 AM , By : Josef B
Apache Strimzi Kafka Bridge implementation
Apache Strimzi Kafka Bridge implementation
help you fix your problem Which version of the bridge are you using? The bridge documentation about exposed API is at the following link for the latest 0.14.0 version: https://strimzi.io/docs/bridge/latest/You can also find an overall description of
TAG : apache-kafka
Date : October 01 2020, 12:00 AM , By : ismail bourigua
How to consume Kafka messages with human-readable timestamps in command line?
How to consume Kafka messages with human-readable timestamps in command line?
Any of those help It is not possible straight forward using kafka-console-consumer (kafka.tools.ConsoleConsumer). kafka-console-consumer to print messages uses kafka.common.MessageFormatter. Its responsibility is to based on properties print messages
TAG : apache-kafka
Date : September 30 2020, 08:00 AM , By : GlyphStorm
Batch Size in kafka jdbc sink connector
Batch Size in kafka jdbc sink connector
wish help you to fix your issue There is no direct solution to sink records in batches but we give try tune below property if it works. I have never tried but my understanding Kafka Sink Connector nothing but consumer to consume message fron topic.ma
TAG : apache-kafka
Date : September 28 2020, 07:00 PM , By : JimmyTask
Kafka Streams: Stream Thread vs Partition of multiple topics
Kafka Streams: Stream Thread vs Partition of multiple topics
seems to work fine If the scenario may occur or not depends on your topology.Actually, stream tasks are assigned to stream threads, not plain partitions. Each task may process a group of partitions. One group contains one or more partitions. If the g
TAG : apache-kafka
Date : September 28 2020, 02:00 PM , By : Zguang Pan
Stream processing from a specific offset to an end offset
Stream processing from a specific offset to an end offset
it helps some times By default, KStreams supports two possible values for auto.offset.reset. It could be either "earliest" or "latest". You can't set it to a specific offset in your application code.There is an option during the application reset. If
TAG : apache-kafka
Date : September 28 2020, 09:00 AM , By : CrazyChicken
Message queue (like RabbitMQ) or Kafka for Microservices?
Message queue (like RabbitMQ) or Kafka for Microservices?
wish helps you Selection depends upon what exactly your microservices needs. Both has something different as compared to other. RabbitMQ in a nutshell
TAG : apache-kafka
Date : September 27 2020, 09:00 PM , By : Filip Płotnicki
Is Kafka cluster a database?
Is Kafka cluster a database?
help you fix your problem cluster means multiple machines that "share the load" among them. this is deliberately vague as there are many ways of achieving this. what is the question here? (disclaimer - my opinion and generally subjective) its a datab
TAG : apache-kafka
Date : September 27 2020, 07:00 PM , By : Zikta
Apache Kafka the order of messages in partition guarantee
Apache Kafka the order of messages in partition guarantee
wish help you to fix your issue Read this article about message ordering in topic partition: https://blog.softwaremill.com/does-kafka-really-guarantee-the-order-of-messages-3ca849fd19d2 , idempotence:(Exactly-once in order semantics per partition)
TAG : apache-kafka
Date : September 27 2020, 03:00 PM , By : Calvin Mosia
Is it ok to use Apache Kafka "infinite retention policy" as a base for an Event sourced system with CQRS?
Is it ok to use Apache Kafka "infinite retention policy" as a base for an Event sourced system with CQRS?
it helps some times your understanding is mostly correct: kafka has no search. definitely not by key. there's a seek to timestamp, but its imperfect and not good for what youre trying to do. kafka actually supports a limited form of transactions (see
TAG : apache-kafka
Date : September 27 2020, 02:00 PM , By : infreezer
kafka-consumer-groups CLI not showing node-kafka consumer groupf
kafka-consumer-groups CLI not showing node-kafka consumer groupf
should help you out Here is the solution that uses kafka-node ConsumerGroup object to write offsets to kafka instead of zookeeper
TAG : apache-kafka
Date : September 27 2020, 10:00 AM , By : user6078600
How to ensure that a Kafka stream is aggregating data for current day
How to ensure that a Kafka stream is aggregating data for current day
I think the issue was by ths following , Each Kafka message does have a timestamp in it's metadata field (ie, in addition to key and value). This timestamp is usually set by the upstream producer that write the data into the topic. By default, this r
TAG : apache-kafka
Date : September 27 2020, 03:00 AM , By : Layth
Is Kafka a message queue and can Kafka be used as the database?
Is Kafka a message queue and can Kafka be used as the database?
Does that help There are 2 patterns named Publish-Subscribe and Message Queue. There are some places discussed the differences. hereKafka especially supports both of these 2 patterns. For the publish-subscribe pattern, Kafka has publisher/subscriber
TAG : apache-kafka
Date : September 26 2020, 05:00 PM , By : Gayathri
Kafka Connect JDBC Sink Connector - java.sql.SQLException: No suitable driver found
Kafka Connect JDBC Sink Connector - java.sql.SQLException: No suitable driver found
this will help You're getting this error because the JDBCSink (and JDBCSource) connectors use JDBC (as the name implies) to connect to the database, and you have not made the JDBC driver for MySQL available to the connector. The best way to fix this
TAG : apache-kafka
Date : September 26 2020, 07:00 AM , By : Akhil Gangadhar

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