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Posted to issues@flink.apache.org by "Jacob Park (JIRA)" <ji...@apache.org> on 2018/03/26 18:20:00 UTC

[jira] [Created] (FLINK-9083) Add async backpressure support to Cassandra Connector

Jacob Park created FLINK-9083:
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             Summary: Add async backpressure support to Cassandra Connector
                 Key: FLINK-9083
                 URL: https://issues.apache.org/jira/browse/FLINK-9083
             Project: Flink
          Issue Type: Improvement
          Components: Cassandra Connector
            Reporter: Jacob Park


As the CassandraSinkBase derivatives utilize async writes, they do not block the task to introduce any backpressure.

I am currently using a semaphore to provide backpressure support by blocking at a maximum concurrent requests limit like how DataStax's Spark Cassandra Connector functions: [https://github.com/datastax/spark-cassandra-connector/blob/v2.0.7/spark-cassandra-connector/src/main/scala/com/datastax/spark/connector/writer/AsyncExecutor.scala#L18]

This improvement has greatly improved the fault-tolerance of our Cassandra Sink Connector implementation on Apache Flink in production. I would like to contribute this feature back upstream.



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