Tomas created SPARK-26841: ----------------------------- Summary: Timestamp pushdown on Kafka table Key: SPARK-26841 URL: https://issues.apache.org/jira/browse/SPARK-26841 Project: Spark Issue Type: Improvement Components: Input/Output Affects Versions: 2.5.0 Reporter: Tomas
As a Spark user I'd like to have fast queries on Kafka table restricted by timestamp. I'd like to have quick answers on questions like "What was inserted in Kafka in past x minutes", "what was inserted in Kafka in specified time range", ... Example: {quote}select * from kafka_table where timestamp > from_unixtime(unix_timestamp() - 5 * 60, "YYYY-MM-dd HH:mm:ss") select * from kafka_table where timestamp > $from_time and timestamp < $end_time {quote} Currently timestamp restrictions is not pushdown to KafkaRelation and querying by timestamp on a large Kafka topic takes forever to complete. *Technical solution* Technically its possible to retrieve Kafka's offsets by provided timestamp with org.apache.kafka.clients.consumer.Consumer#offsetsForTimes(..) method. Afterwards we can query Kafka topic by retrieved timestamp ranges. Querying by timestamp range is already implemented so this change should have just a minor impact. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org