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https://issues.apache.org/jira/browse/SPARK-25466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maxim Gekk updated SPARK-25466:
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Summary: Documentation does not specify how to set Kafka consumer cache
capacity for SS (was: Documentation does not specify how to set fafka consumer
cache capacity for SS)
> Documentation does not specify how to set Kafka 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
> Priority: Major
> Labels: doc, ss
>
> 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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