Stream Processing

ksqlDB ksqlDB is the event streaming database purpose-built for stream processing applications. It’s available both as a managed service in Confluent Cloud, or you can run it yourself. Kafka Streams Kafka Streams is a client library for building applications and microservices, where the input and output data are stored in an Apache Kafka® cluster. It combines the simplicity of writing and deploying standard Java and Scala applications on the client side with the benefits of Kafka’s server-side cluster technology. Apache Flink® Let’s talk about about Apache Flink®!

Topic	Replies	Views	Activity
About the Stream Processing category Stream Processing	0	2053	25 May 2023
Issue after upgrading to CMF 2.4.2/CFK 3.3.0: FlinkApplication resolution fails cross-namespace FlinkEnvironment Stream Processing	8	160	12 October 2026
CMF 2.4.2 Unable to Access Flink Web UI over TLS (HTTPS) / Redirected to Internal Kubernetes URL Apache Flink®	3	54	12 October 2026
CmfRestClass reconciliation fails with HTTP 400 when configuring TLS for CMF Stream Processing	3	80	5 October 2026
CFK 3.3.0 - FlinkEnvironment is never reconciled, operator logs cmfDay2OpsEnabled=false Stream Processing	1	683	28 September 2026
ksqlDB JSON_SR with existing KEY_SCHEMA_ID fails on structured key: Incompatible schema of type JSON / id.compatibility.strict ksqlDB	0	685	17 May 2026
Kafka Streams EOS - Producer fenced Kafka Streams	4	1213	16 April 2026
Kafka Streams FK-join: force result timestamp to always come from main (left) flow Kafka Streams	5	1337	20 March 2026
KTable-KTable Foreign-Key LEFT JOIN: Discrepancy between documentation and behavior when FK is NULL Kafka Streams	1	882	20 March 2026
Unable to migrate metadata from zookeeper to KRaft Kafka Streams	0	684	13 March 2026
Kafka Streams and Schemaregistry interaction, multiple teams, languages Kafka Streams	2	563	6 March 2026
Kafka Streams - bizarre data loss Kafka Streams	8	851	5 March 2026
CompleteBatch Infinite Loop With BatchSize Greater Than 1 Kafka Streams	6	331	2 February 2026
Does a tombstone in toTable() propagate to downstream groupBy/aggregate if the key never existed? Kafka Streams	3	184	2 February 2026
Issue consuming Avro Apache Flink®	1	174	14 January 2026
Reading windowed topic into a global store Stream Processing	5	195	10 December 2025
Using ConsumerTimestampsInterceptor with kafka Streams Kafka Streams	1	185	12 November 2025
Messages processing more than once in a exactly_once kafka streams application Kafka Streams	7	3708	15 October 2025
Looking for feedback? What are your most common pain points in Apache Kafka? Stream Processing	0	160	17 October 2025
Kafka Streams main consumer fetch rate stays low after GlobalKTable (RocksDB) restore Kafka Streams	0	113	1 October 2025
KSQLDB Processing Time ksqlDB	0	128	13 September 2025
Using Json Value_format in KsqlDB I can see the topic messages null in stream ksqlDB	0	106	29 August 2025
Are records with a matching key from different inputs processed by the same node instances? Kafka Streams	1	182	20 August 2025
Problem with exactly-once semantics in kafka-streams Kafka Streams	4	408	11 August 2025
Sliding window aggregation not counting back down to zero Kafka Streams	5	248	6 August 2025
Avoiding RecordTooLargeException on Kafka Streams Kafka Streams	4	446	28 July 2025
Why Term Consume? Kafka Streams	1	167	24 July 2025
Running a select query throwing error in control center console ksqlDB	0	131	16 July 2025
Kafka streams design question related to Global Ktable Kafka Streams	0	134	9 July 2025
Kafka Streams KTable Race Condition: Multiple Concurrent Updates See Same Stale State Kafka Streams	1	171	23 June 2025