title: Druid Kafka ingestion with read-your-writes
body: <p>I'm learning Druid now. I read that ingestion via Kafka Indexing Service guarantees exactly-once semantics.</p>
  
  <p>However, I have a problem with determining consistency model of Druid. Typically streams are asynchronous, but I want to have read-your-writes semantics in application.</p>
  
  <p>Is there any possibility to check Druid's ingestion status? For example, I send event A and want to check if it was already saved in Druid. If yes, query to Druid should return result with this value.</p>
  
  <p>Maybe there is some other possibility to do real-time ingestion with exactly-once semantics and with read-your-writes?</p>