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	2056	25 May 2023
CMF 2.5.0 : FlinkApplication Arrays Are Overridden Instead of Merged with FlinkEnvironment Defaults Apache Flink®	0	14	6 November 2026
Issue after upgrading to CMF 2.4.2/CFK 3.3.0: FlinkApplication resolution fails cross-namespace FlinkEnvironment Stream Processing	9	201	6 November 2026
CMF Helm Deployment Is Not Idempotent Due to rollme Annotation Regeneration Apache Flink®	1	26	6 November 2026
CMF 2.4.2 and Restricted Pod Security Standard (PSS) Compliance Apache Flink®	1	24	6 November 2026
Slow native memory growth with Confluent.Kafka (.NET) in Kubernetes, fixed with MALLOC_ARENA_MAX=2 Kafka Streams	0	54	22 October 2026
CMF 2.4.2 Unable to Access Flink Web UI over TLS (HTTPS) / Redirected to Internal Kubernetes URL Apache Flink®	3	90	12 October 2026
CmfRestClass reconciliation fails with HTTP 400 when configuring TLS for CMF Stream Processing	3	116	5 October 2026
CFK 3.3.0 - FlinkEnvironment is never reconciled, operator logs cmfDay2OpsEnabled=false Stream Processing	1	714	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	699	17 May 2026
Kafka Streams EOS - Producer fenced Kafka Streams	4	1233	16 April 2026
Kafka Streams FK-join: force result timestamp to always come from main (left) flow Kafka Streams	5	1353	20 March 2026
KTable-KTable Foreign-Key LEFT JOIN: Discrepancy between documentation and behavior when FK is NULL Kafka Streams	1	896	20 March 2026
Unable to migrate metadata from zookeeper to KRaft Kafka Streams	0	690	13 March 2026
Kafka Streams and Schemaregistry interaction, multiple teams, languages Kafka Streams	2	570	6 March 2026
Kafka Streams - bizarre data loss Kafka Streams	8	920	5 March 2026
CompleteBatch Infinite Loop With BatchSize Greater Than 1 Kafka Streams	6	344	2 February 2026
Does a tombstone in toTable() propagate to downstream groupBy/aggregate if the key never existed? Kafka Streams	3	205	2 February 2026
Issue consuming Avro Apache Flink®	1	180	14 January 2026
Reading windowed topic into a global store Stream Processing	5	219	10 December 2025
Using ConsumerTimestampsInterceptor with kafka Streams Kafka Streams	1	198	12 November 2025
Messages processing more than once in a exactly_once kafka streams application Kafka Streams	7	3743	15 October 2025
Looking for feedback? What are your most common pain points in Apache Kafka? Stream Processing	0	165	17 October 2025
Kafka Streams main consumer fetch rate stays low after GlobalKTable (RocksDB) restore Kafka Streams	0	118	1 October 2025
KSQLDB Processing Time ksqlDB	0	132	13 September 2025
Using Json Value_format in KsqlDB I can see the topic messages null in stream ksqlDB	0	110	29 August 2025
Are records with a matching key from different inputs processed by the same node instances? Kafka Streams	1	188	20 August 2025
Problem with exactly-once semantics in kafka-streams Kafka Streams	4	422	11 August 2025
Sliding window aggregation not counting back down to zero Kafka Streams	5	268	6 August 2025
Avoiding RecordTooLargeException on Kafka Streams Kafka Streams	4	484	28 July 2025