[jira] [Created] (SPARK-25466) Documentation does not specify how to set fafka consumer cache capacity for SS

["Patrick McGloin (JIRA)" <ji...@apache.org>]

Patrick McGloin created SPARK-25466:
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             Summary: Documentation does not specify how to set fafka consumer cache capacity for SS
                 Key: SPARK-25466
                 URL: https://issues.apache.org/jira/browse/SPARK-25466
             Project: Spark
          Issue Type: Bug
          Components: Structured Streaming
    Affects Versions: 2.3.0
            Reporter: Patrick McGloin


When hitting this warning with SS:

19-09-2018 12:05:27 WARN  CachedKafkaConsumer:66 - KafkaConsumer cache hitting max capacity of 64, removing consumer for CacheKey(spark-kafka-source-e06c9676-32c6-49c4-80a9-2d0ac4590609--694285871-executor,MyKafkaTopic-30)

If you Google you get to this page:

https://spark.apache.org/docs/latest/streaming-kafka-0-10-integration.html

Which is for Spark Streaming and says to use this config item to adjust the capacity: "spark.streaming.kafka.consumer.cache.maxCapacity".

This is a bit confusing as SS uses a different config item: "spark.sql.kafkaConsumerCache.capacity"

Perhaps the SS Kafka documentation should talk about the consumer cache capacity?  Perhaps here?

https://spark.apache.org/docs/2.2.0/structured-streaming-kafka-integration.html

Or perhaps the warning message should reference the config item.  E.g

19-09-2018 12:05:27 WARN  CachedKafkaConsumer:66 - KafkaConsumer cache hitting max capacity of 64, removing consumer for CacheKey(spark-kafka-source-e06c9676-32c6-49c4-80a9-2d0ac4590609--694285871-executor,MyKafkaTopic-30).  *The cache size can be adjusted with the setting "spark.sql.kafkaConsumerCache.capacity".*





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