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https://issues.apache.org/jira/browse/SPARK-26841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tomas updated SPARK-26841:
--------------------------
Description:
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 to Kafka in past x minutes
* What was inserted to 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 are 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
minor impact.
was:
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.
> 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: 2.4.0
> Reporter: Tomas
> Priority: Major
> Labels: Kafka, pushdown, timestamp
>
> 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 to Kafka in past x minutes
> * What was inserted to 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 are 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
> minor impact.
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