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Kafka Streams Persistent Store cleanup


Kafka Streams Persistent Store cleanup

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Kafka Streams Persistent Store cleanup
Tag : apache-kafka , By : nhuser
Date : November 28 2020, 04:01 AM

around this issue We were having a similar issue, we simply scheduled a job for cleaning the store in our processor/transformer. Just implement your isDataOld(nextValue) and you are good to go.
@Override
public void init(ProcessorContext context) {
this.kvStore = (KeyValueStore<Key, Value>) this.context.getStateStore("KV_STORE_NAME");
this.context.schedule(60000, PunctuationType.STREAM_TIME, (timestamp) -> {
    KeyValueIterator<Key, Value> iterator = kvStore.all();
    while (iterator.hasNext()){
    KeyValue<Key,Value> nextValue = iterator.next();
    if isDataOld(nextValue)
       kvStore.delete(nextValue.key);
    }

});
}

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Is there any option of cold-bootstraping a persistent store in Kafka streams?


Tag : development , By : OllieDoodle
Date : March 29 2020, 07:55 AM
around this issue Changelog topics that are used to backup stores don't have a retention time but are configured with log-compaction enabled (cf. https://kafka.apache.org/documentation/#compaction). Thus, it's guaranteed that no data is lost no matter how long you run. The changelog topic will always contain the exact same data as your RocksDB stores.
Thus, for fail-over or scale-out, when a task migrates and a store need to be rebuild, it will be a complete copy of the original store.

In-memory vs persistent state stores in Kafka Streams?


Tag : development , By : Fenix Drakken
Date : March 29 2020, 07:55 AM
hop of those help? I've got a very limited understanding of the internals of Kafka Streams and the different use cases of state stores, esp. in-memory vs persistent, but what I managed to learn so far is that a persistent state store is one that is stored on disk (and hence the name persistent) for a StreamTask.
That does not give much as the names themselves in-memory vs persistent may have given the same understanding, but something that I found quite refreshing was when I learnt that Kafka Streams tries to assign partitions to the same Kafka Streams instances that had the partitions assigned before (a restart or a crash).

Kafka Streams persistent store error: the state store, may have migrated to another instance


Tag : apache-kafka , By : mdiezb
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The state store needs some time to be prepared usually. The simplest approach is like below. (code from the official document)
public static <T> T waitUntilStoreIsQueryable(final String storeName,
                                              final QueryableStoreType<T> queryableStoreType,
                                              final KafkaStreams streams) throws InterruptedException {
  while (true) {
    try {
      return streams.store(storeName, queryableStoreType);
    } catch (InvalidStateStoreException ignored) {
      // store not yet ready for querying
      Thread.sleep(100);
    }
  }
}

Kafka-streams: setting internal topics cleanup policy to delete doesn't work


Tag : apache-kafka , By : user186831
Date : March 29 2020, 07:55 AM
Hope that helps Guozhang for his answer in kafka mailing list:

Kafka Topic Retention and impact on the State store in Kafka streams


Tag : apache-kafka , By : esimran
Date : March 29 2020, 07:55 AM
I wish this help you
Can state-stores have unlimited key-value pairs, or they are governed by the rules of kafka topics based on the log.retention policies or log.segment.bytes?
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