README.md

Spark Streaming Kafka consumer vaquar khan

POC with Spark processing a stream from Kafka. Uses Log4j2 kafka appender.# Apache-kafka-spark-streaming-poc

https://stanford.edu/~rezab/sparkclass/slides/td_streaming.pdf

https://youtu.be/_adU0xpFpU8

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http://blog.cloudera.com/blog/2015/03/exactly-once-spark-streaming-from-apache-kafka/

http://www.slideshare.net/prakash573/spark-streaming-best-practices

https://databricks.gitbooks.io/databricks-spark-knowledge-base/content/best_practices/README.html

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https://github.com/beeva/beeva-best-practices/blob/master/big_data/spark/README.md

https://www.infoq.com/articles/apache-spark-introduction

http://hortonworks.com/hadoop-tutorial/introduction-spark-streaming/

https://databricks.com/blog/2015/07/30/diving-into-apache-spark-streamings-execution-model.html

http://davidssysadminnotes.blogspot.com/2016/09/running-spark-streaming-dcos.html

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FAQ:

https://docs.cloud.databricks.com/docs/latest/databricks_guide/07%20Spark%20Streaming/15%20Streaming%20FAQs.html

JIRA: https://issues.apache.org/jira/browse/SPARK-18124

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http://spark.apache.org/docs/latest/configuration.html

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http://aseigneurin.github.io/

Spark Streaming Backpressure.

Issue

The streaming part works fine but when we initially start the job, we have to deal with really huge Kafka message backlog, millions of messages, and that first batch runs for over 40 hours, and after 12 hours or so it becomes very very slow, it keeps crunching messages, but at a very low speed.

Solution

 spark.streaming.backpressure.enabled
 spark.streaming.receiver.maxRate
 
 spark.streaming.kafka.maxRatePerPartition
 spark.streaming.backpressure.enabled
 spark.streaming.receiver.maxRate

https://vanwilgenburg.wordpress.com/2015/10/06/spark-streaming-backpressure/