Piye cara producers lan consumers bisa makarya ing Kafka?

Question

Accepted Answer

**Producers** menerbitake (nulis) acara menyang topic Kafka, lan **consumers** subscribe menyang (maca) acara saka mangkene. Ngerti kepriye cara makarya — kalebu partisioning, offset, lan consumer group — iku dhasar kanggo nggunakake Kafka.

## Producers — nulis acara

```text
PRODUCERS publish events to TOPICS:
  → send a record (key, value) to a topic
  → the key determines the PARTITION (same key → same partition → ordering for that key);
    no key → distributed (round-robin)
  → can configure ACKNOWLEDGMENTS (acks) for durability (wait for replicas to confirm)
  → batching, compression for throughput
```

## Consumers — maca acara

```text
CONSUMERS subscribe to topics and read events:
  → read from partitions, tracking their OFFSET (position) → resume from where they left off
  → read at their OWN PACE (events are retained); can re-read (replay) from any offset
  → COMMIT offsets to record progress (so they don't reprocess on restart)
```

## Consumer group (kunci kanggo scaling)

```text
CONSUMER GROUP → consumers working together to consume a topic:
  → each partition is consumed by ONE consumer in the group → parallel processing
    (distribute partitions across the group's consumers)
  → add consumers (up to the partition count) to scale consumption
  → if a consumer fails, its partitions are REBALANCED to others (fault tolerance)
DIFFERENT GROUPS → each group reads ALL the events independently (pub/sub: many groups
  each get the full stream)
```

## Kepentingan kasebut

Ngerti kepriye producers lan consumers bisa makarya iku dhasar amarga iku **cara data mili mlebu lan metu saka Kafka**, dadi perlu kanggo nggunakake Kafka.

Producers nulis acara lan consumers maca iku — alur data dhasar.

Ngerti **producers** — menerbitake acara menyang topic, karo **key nemtokake partition** (key padha menyang partition padha kanggo urutan, tanpa key nandur round-robin), nata acknowledgment kanggo durability, lan batching kanggo throughput — tutup kepriye data mlebu Kafka.

Ngerti **consumers** — maca acara nalika nglacak **offset** (posisi) kanggo nerusake saka ngendi iku manggon, maca ing kacepetan dhewe amarga acara diandel, bisa **replay** saka offset napa wae, lan commit offset kanggo nyathet progress — tutup kepriye data dikaca, kalebu kemampuan replay khas Kafka.

Paling penting, ngerti **consumer group** iku perlu kanggo model scaling Kafka: consumers sing gumandeng-gandeng ngendi **saben partition dikanca dening siji consumer ing grup** (ngaktifake processing parallel, scaling kanthi nambah consumers nganti jumlah partition), karo automatic **rebalancing** yen consumer gagal (fault tolerance), nanging **grup consumer beda-beda bisa maca kabeh acara kanthi mandiri** (ngaktifake pub/sub ngendi plural grup masing-masing entuk alur lengkap).

Model consumer-group iki dhasar kepriye Kafka scaling consumption lan suportake pola kapindah (ing sajroning grup) lan pub/sub (mbubar grup).

Amarga producers lan consumers iku cara data mili mlebu lan metu saka Kafka, lan amarga ngerti kepriyane — partisioning, offset, replay, lan utamane consumer group (kunci kanggo scaling lan dualitas queue/pub-sub) — iku perlu kanggo nggunakake Kafka, ngerti kepriye producers lan consumers bisa makarya iku perlu, dhasar pengetahuan Kafka — dhasar kanggo alur data ing Kafka, karo consumer group dadi utama kanggo ngerti scaling lan model consumption Kafka, lan perlu kanggo sapa wae sing nggunakake Kafka.