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APACHE-KAFKA QUESTIONS

Kafka ObjectDeserializer?
Kafka ObjectDeserializer?
help you fix your problem if you truly dont care about the payloads just go for a Consumer, and save yourself the CPU cycles of even trying to decode avro.you do this by setting your value.deserializer for the consumer to be org.apache.kafka.common.s
TAG : apache-kafka
Date : January 09 2021, 02:14 PM , By : user103892
secor ignores message.timestamp.input.pattern
secor ignores message.timestamp.input.pattern
Hope this helps You can write your custom implementation of TimestampedMessageParser. Extend this class and make your custom class. Then over-ride the method extractPartitions(Message payload) and parse(Message message)In the 2nd method, get the byte
TAG : apache-kafka
Date : January 09 2021, 02:14 PM , By : user187301
Kafka consumer groups still exists after the zookeeper and Kafka servers are restarted
Kafka consumer groups still exists after the zookeeper and Kafka servers are restarted
will be helpful for those in need Since Kafka 0.9, Consumer Offsets are stored directly in Kafka in an internal topic called __consumer_offsets.Consumer Offsets are preserved across restarts and are kept at least for offsets.retention.minutes (7 days
TAG : apache-kafka
Date : January 08 2021, 03:18 AM , By : geo
S3 sink record field TimeBasedPartitioner not working
S3 sink record field TimeBasedPartitioner not working
will be helpful for those in need Your field props.eventTime is coming in as microsecond and not millisecond.This can be identified in the stack trace and by inspecting the relevant code in org.joda.time doParseMillis method, which is used by the Con
TAG : apache-kafka
Date : January 07 2021, 03:08 PM , By : stan
Kafka Producer design - multiple topics
Kafka Producer design - multiple topics
I wish this helpful for you By separate publisher thread, I think you mean separate producer objects. If so..Since messages are stored as key-value pairs in Kafka, different topics can have different key-value types. So if your Kafka topics have diff
TAG : apache-kafka
Date : January 07 2021, 07:50 AM , By : Jason Haar
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 : January 02 2021, 06:48 AM , By : user158220
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 : January 02 2021, 06:48 AM , By : Sanoran
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 : January 02 2021, 06:48 AM , By : Allen
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 : January 02 2021, 06:48 AM , By : Monev
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 : January 02 2021, 06:48 AM , By : user157654
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 : January 02 2021, 06:48 AM , By : user187383
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 : January 02 2021, 06:48 AM , By : cautionsign
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 : January 02 2021, 06:48 AM , By : Erik
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 : January 02 2021, 06:48 AM , By : billputer
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 : January 02 2021, 06:48 AM , By : Alecsandru Soare
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 : January 02 2021, 06:48 AM , By : Ben Kohn
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 : January 02 2021, 06:48 AM , By : user103892
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 : January 02 2021, 06:48 AM , By : user152319
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 : January 02 2021, 06:48 AM , By : user183825
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 : January 02 2021, 06:48 AM , By : joshboles
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 : January 02 2021, 06:48 AM , By : user112141
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 : January 02 2021, 06:48 AM , By : arbeitandy
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 : January 02 2021, 06:48 AM , By : Jouni
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 : January 02 2021, 06:48 AM , By : user133629
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 : January 02 2021, 06:48 AM , By : vferman
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 : January 02 2021, 06:48 AM , By : Tom Smith
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 : January 02 2021, 06:48 AM , By : Puneet Madaan
Trying to start up kafka server, after starting zookeeper, but getting ERROR Invalid config, exiting abnormally
Trying to start up kafka server, after starting zookeeper, but getting ERROR Invalid config, exiting abnormally
To fix this issue Mistake is you are running zookeeper-server-start.bat with kafka server .properties,you need to try with kafka-server-start.bat 1) first go to folder where kafka was there and try this
TAG : apache-kafka
Date : January 02 2021, 06:36 AM , By : chintown
Kafka connect transformation isn't applied
Kafka connect transformation isn't applied
Does that help If you're running 0.10.1 then SMT don't exist yet :) Single Message Transform were added to Apache Kafka in version 0.10.2 with KIP-66, over 2.5 years ago. You might want to consider running a more up to date release of Kafka, the late
TAG : apache-kafka
Date : December 31 2020, 03:06 AM , By : dantino
How to create a Kafka topics on a SASL enabled Zookeeper?
How to create a Kafka topics on a SASL enabled Zookeeper?
With these it helps We have a kafka cluster and are in the process of locking down the specific nodes based on these standards: https://docs.hortonworks.com/HDPDocuments/HDP3/HDP-3.1.0/zookeeper-acls/content/zookeeper_acls_best_practices_kafka.html ,
TAG : apache-kafka
Date : December 30 2020, 04:10 PM , By : Chris Lomax
Spring Kafka Template send with retry based on different cases
Spring Kafka Template send with retry based on different cases
With these it helps The serialization exception will occur before the message is sent, so the retries property is irrelevant in that case; it only applies when the message is actually sent.
TAG : apache-kafka
Date : December 28 2020, 05:45 AM , By : user185949
What happens to existing topic's partitions when a new broker is added to the Kafka cluster?
What happens to existing topic's partitions when a new broker is added to the Kafka cluster?
Hope that helps Kafka does not automatically redistribute existing partitions when brokers are added to a a cluster.This is for a few reasons:
TAG : apache-kafka
Date : December 27 2020, 04:54 PM , By : Angelo Giannatos
what's the difference between kafka-preferred-replica-election.sh and auto.leader.rebalance.enable?
what's the difference between kafka-preferred-replica-election.sh and auto.leader.rebalance.enable?
I hope this helps . When running kafka-preferred-replica-election.sh, it forces the election of the preferred replica for all partitions. On the other hand, when you set auto.leader.rebalance.enable to true, the Controller will regularly check the im
TAG : apache-kafka
Date : December 27 2020, 04:53 PM , By : ck1
Is Kafka topic linked with zookeeper and If zookeeper changed will topic disappeare
Is Kafka topic linked with zookeeper and If zookeeper changed will topic disappeare
wish help you to fix your issue Check this documentation provided by confluent. According to this Apache Kafka® uses ZooKeeper to store persistent cluster metadata and is a critical component of the Confluent Platform deployment. For example, if you
TAG : apache-kafka
Date : December 26 2020, 01:01 AM , By : hyperNURb
java.lang.IllegalArgumentException: A KCQL error occurred.FIELD_ID is not a valid field name
java.lang.IllegalArgumentException: A KCQL error occurred.FIELD_ID is not a valid field name
around this issue I had a couple of similar issues with Kafka Connect and Attunity Replicate. Although I'd have to take a look at your original data stream, the following SMT did the trick for me:
TAG : apache-kafka
Date : December 25 2020, 01:01 PM , By : DicksGarage
Difference between executing StreamTasks in the same instance v/s multiple instances
Difference between executing StreamTasks in the same instance v/s multiple instances
this one helps. By default, a single KafkaStreams instance runs one thread, thus in "Method 1" all three tasks are executed by a single thread. In "Method 2" each task is executed by its own thread. Note, that you can also configure multiple thread p
TAG : apache-kafka
Date : December 25 2020, 12:31 PM , By : Lex Viatkine
Kafka CASE error fieldSchema for field cannot be null
Kafka CASE error fieldSchema for field cannot be null
I hope this helps . What version of KSQL are you using? I've just tried to recreate this in my environment running KSQL 5.3.0, and got an expected error (and better error message!):
TAG : apache-kafka
Date : December 25 2020, 09:30 AM , By : Eric
Send message to Kafka when SessionWindows was started and ended
Send message to Kafka when SessionWindows was started and ended
I wish this helpful for you I want to send a message to the Kafka topic when new SessionWindow was created and when was ended. I have the following code , You can write a custom window trigger.
TAG : apache-kafka
Date : December 25 2020, 06:47 AM , By : Chandra P Singh
Where does Zookeeper keep Kafka ACL list?
Where does Zookeeper keep Kafka ACL list?
I wish this help you You can access Zookeeper using the zookeeper-shell.sh script. There is a znode called kafka-acl where information about ACLs for group, topic, cluster and so on are stored. You can list for example information about ACLs on topic
TAG : apache-kafka
Date : December 25 2020, 06:45 AM , By : JSebok
How does Confluent's Schema Registry assign schema id's?
How does Confluent's Schema Registry assign schema id's?
it should still fix some issue Confluent Documentation explains how unique IDs are assigned to schemas:
TAG : apache-kafka
Date : December 25 2020, 03:01 AM , By : Ed.
Consumer Aware call on consumer thread safety
Consumer Aware call on consumer thread safety
I hope this helps you . Yes; it's safe there as long as you invoke it on the calling thread; this is NOT safe:
TAG : apache-kafka
Date : December 24 2020, 03:28 PM , By : ezzze
My producer can create a topic, but data doesn't seem to be stored inside the broker
My producer can create a topic, but data doesn't seem to be stored inside the broker
should help you out I finally figured out. If you experienced similar problem, there are things you can do. In your server.properties, uncomment these and put the ip and port. (There seems to be a problem with the port, so I changed it.)
TAG : apache-kafka
Date : December 24 2020, 12:01 PM , By : geo
How to notify user through kafka producer to consumer process
How to notify user through kafka producer to consumer process
fixed the issue. Will look into that further Apache Kafka is a message queue that decouples the producer side from the consumer side. It does not provide a mechanism for consumers to directly interact with producers.That said, you have a few options.
TAG : apache-kafka
Date : December 24 2020, 10:30 AM , By : Tony Siu
How to query a database from a Kafka processor?
How to query a database from a Kafka processor?
wish of those help I read that messages in a topic have a time to leave, after which they are deleted.
TAG : apache-kafka
Date : December 24 2020, 03:01 AM , By : TheMoo
In which config file i can put this "max.task.idle.ms"?
In which config file i can put this "max.task.idle.ms"?
will be helpful for those in need /etc/kafka/server.properties is a config file for the Kafka broker.I think you are looking for /etc/ksql/ksql-server.properties
TAG : apache-kafka
Date : December 23 2020, 05:30 PM , By : pdkent
Category projections using kafka and cassandra for event-sourcing
Category projections using kafka and cassandra for event-sourcing
seems to work fine With this kind of architecture, you have to choose between: Global event stream per type - simple Partitioned event stream per type - scalable
TAG : apache-kafka
Date : December 23 2020, 08:30 AM , By : lonehunter01
Kafka Connect Sink (GCS) only reading from latest offset, configure to read from earliest?
Kafka Connect Sink (GCS) only reading from latest offset, configure to read from earliest?
wish helps you When you create a connector for the first time it will take by default the earliest offset. You should see this in the Connect worker log:
TAG : apache-kafka
Date : December 23 2020, 07:01 AM , By : Manu
Kafka topics not created empty
Kafka topics not created empty
I hope this helps you . I found the problem. A consumer was consuming from the topic and the topic was never actually deleted. I used this tool to have a GUI that allowed me to see the topics easily https://github.com/tchiotludo/kafkahq. Anyway, the
TAG : apache-kafka
Date : December 23 2020, 01:30 AM , By : Nic Doye
KafkaConsumer position(TopicPartition) never ends
KafkaConsumer position(TopicPartition) never ends
To fix this issue since number of brokers is 1, replication factor must also be 1, right ?
TAG : apache-kafka
Date : December 23 2020, 01:30 AM , By : Kuer
how do i upgrade apache kafka in linux
how do i upgrade apache kafka in linux
To fix the issue you can do it's fairly simple to upgrade Kafka. It would have been easier for you to separate config files from binary directories, as a result, from what I understand, your config file remains with the untar package folder. You can
TAG : apache-kafka
Date : December 23 2020, 12:30 AM , By : PatrickSimonHenk
Kafka multiple producer writing to same topic?
Kafka multiple producer writing to same topic?
seems to work fine Leader is not dependent on the producers or consumers, so p1 will be always returned as a leader. Offsets are not important for producers, they are defined per consumer group. Offset determines, which messages were read and committ
TAG : apache-kafka
Date : December 22 2020, 04:01 AM , By : Jody Bannon
Kafka topic creation command
Kafka topic creation command
To fix the issue you can do No, it must be a typo. If you want to create a topic with two partitions and two replicas, the command should be as follows:
TAG : apache-kafka
Date : December 22 2020, 12:30 AM , By : micaleel
KSQL websocket endpoints
KSQL websocket endpoints
hope this fix your issue Websockets is not a supported API, and not documented. I guess you could run Confluent Control Center yourself and sniff its behaviour, but there'd be no guarantee that the API wouldn't change.
TAG : apache-kafka
Date : December 20 2020, 04:46 AM , By : Liy
Kafka Producer Idempotence - Exactly Once or Just Producer Transaction is Enough?
Kafka Producer Idempotence - Exactly Once or Just Producer Transaction is Enough?
With these it helps The idempotent producer only guarantees Exactly once semantics at a per partition level and within the lifetime of the producer.So it is able to cover scenario 1).
TAG : apache-kafka
Date : December 10 2020, 07:16 AM , By : Dave
Is ProcessorContext.schedule thread-safe?
Is ProcessorContext.schedule thread-safe?
I wish did fix the issue. Registering a punctuation will not spawn a new thread. The number of used threads in determined by num.stream.threads configuration only. Hence, if you register a punctuation, it's executed on the same thread as the topology
TAG : apache-kafka
Date : December 09 2020, 05:02 PM , By : Alex Bartzas
No File writen down to HDFS in flink
No File writen down to HDFS in flink
Hope that helps Off the top of my head, there could be two things to look into: Is the HDFS namenode properly configured so that Flink knows it tries to write to HDFS instead of local disk? What do the nodemanger and taskmanager logs say? it could fa
TAG : apache-kafka
Date : December 05 2020, 12:14 PM , By : Janne Laine
Can Kafka brokers store data not only in binary format but also Avro, JSON, and strings?
Can Kafka brokers store data not only in binary format but also Avro, JSON, and strings?
I hope this helps you . When data is shipped to Kafka Brokers, it is serialized from different data types i.e avro/json/string/other data types into bytearray format before writing into log files. Kafka topic log files will always have data stored in
TAG : apache-kafka
Date : December 05 2020, 12:06 PM , By : redha
Reactor Kafka: Exactly Once Processing Sample
Reactor Kafka: Exactly Once Processing Sample
help you fix your problem I've read many articles where there are many different configurations to achieve exactly once processing. , See the javadocs for receiveExactlyOnce
TAG : apache-kafka
Date : December 05 2020, 12:06 PM , By : Sebastian Gift
How Does Prometheus Scrape a Kafka Topic?
How Does Prometheus Scrape a Kafka Topic?
it helps some times When you add that argument from the Kafka container, it scrapes the MBeans of the JMX metrics, not any actual topic data, since Prometheus isn't a Kafka consumer From that JMX information, you'd see metrics such as message rate an
TAG : apache-kafka
Date : December 05 2020, 06:54 AM , By : user96271
How can I test a Spring Cloud Stream Kafka Streams application that uses Avro and the Confluent Schema Registry?
How can I test a Spring Cloud Stream Kafka Streams application that uses Avro and the Confluent Schema Registry?
To fix the issue you can do Sorting this out has been a real pain, but finally I managed to make it work using fluent-kafka-streams-tests:Extra dependencies:
TAG : apache-kafka
Date : December 05 2020, 06:48 AM , By : TheDave1022

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