Norikra

Schemaless stream processor querying JSON events in memory with Esper EPL.

Provider: default
Kind: Stream processor
Category: Messaging
Official docs: https://norikra.github.io/

Properties · 3 set by this component

property	type	values	required	kind default	this component
checkpointIntervalSeconds	integer	—	no	—	inherited
exactlyOnce	boolean	—	no	false	▸ false
instances	integer	—	no	—	inherited
lateDataPolicy	enum	drop \| shift \| sideline	no	—	inherited
managed	boolean	—	no	false	▸ false
persistsToDisk · component property	boolean	—	no	false	inherited
queryLanguage · component property	enum	esper-epl	no	esper-epl	inherited
schemaless · component property	boolean	—	no	true	inherited
stateBackend	enum	memory \| rocksdb \| external	no	memory	▸ memory
watermarkSeconds	integer	—	no	—	inherited
windowing	enum	none \| event-time \| processing-time	no	none	inherited

Rules that apply · 1

Every rule whose selector covers this component's kind or its category. Whether a rule fires depends on the design: its properties, its edges and its groups.

Event-time windows without watermarkwarning

windowed-aggregation-without-watermark

Event-time windows need a watermark to know when a window is complete. Without one the processor either waits forever or closes windows early and silently drops late events.

— all of these hold:
— the node's `windowing` is "event-time"
— the node's `watermarkSeconds` has no value

Use it in a design

nodes:
  - { id: "norikra", component: "norikra" }

Other Stream processor products · 33

Realtime Compute for Apache Flinkalibaba-flinkalibabacloudstream-processor Amazon EventBridge Pipesaws-eventbridge-pipesawsstream-processor Amazon Data Firehoseaws-firehoseawsstream-processor Amazon Managed Service for Apache Flinkaws-managed-flinkawsstream-processor Amazon OpenSearch Ingestionaws-opensearch-ingestionawsstream-processor Azure Stream Analyticsazure-stream-analyticsazurestream-processor Cloudflare Logpushcloudflare-logpushcloudflarestream-processor Cloudflare Pipelinescloudflare-pipelinescloudflarestream-processor Arroyoarroyostream-processor Apache Beambeamstream-processor Bytewaxbytewaxstream-processor Drasidrasistream-processor Apache Flinkflinkstream-processor Kafka Streamskafka-streamsstream-processor ksqlDBksqldbstream-processor Logstashlogstashstream-processor Materializematerializestream-processor Apache NiFinifistream-processor Redpanda Connectredpanda-connectstream-processor RisingWaverisingwavestream-processor Apache Samzasamzastream-processor Snowplowsnowplowstream-processor Spark Structured Streamingspark-streamingstream-processor Apache Stormstormstream-processor Generic stream processorstream-processorstream-processor Tremortremorstream-processor Google Cloud Dataflowgoogle-dataflowgcpstream-processor Manufacturing Data Enginegoogle-manufacturing-data-enginegcpstream-processor Activity Tracker Event Routingibm-activity-tracker-event-routingibmstream-processor IBM Cloud Logs Routingibm-logs-routingibmstream-processor IBM Cloud Metrics Routingibm-metrics-routingibmstream-processor OCI Connector Huboci-connector-hubocistream-processor OCI GoldenGate Stream Analyticsoci-goldengate-stream-analyticsocistream-processor

Source

1# yaml-language-server: $schema=../../schema/component.schema.json
2# Norikra: "Stream processing with SQL for everybody" - a JRuby/JVM server whose queries are "SQL with
3# window specifier support (It's actually Esper's EPL)", including joins and subqueries. Input and
4# output events are schemaless JSON, and state is memory only: "norikra stores query output events
5# into built-in memory pool" and "norikra does not use disks" ("Norikra: Stream processing with SQL
6# for everybody"). Windowing is per query, so none is claimed here.
7schemaVersion: "1"
8type: "component"
9id: "norikra"
10kind: "stream-processor"
11provider: "default"
12docs: "https://norikra.github.io/"
13defaults:
14  managed: false
15  stateBackend: "memory"
16  exactlyOnce: false
17properties:
18  schemaless:
19    type: "boolean"
20    default: true
21  persistsToDisk:
22    type: "boolean"
23    default: false
24  queryLanguage:
25    type: "enum"
26    values: ["esper-epl"]
27    default: "esper-epl"

The same page as markdown, for an agent: /catalogue/components/norikra.md