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https://issues.apache.org/jira/browse/FLINK-9083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638763#comment-16638763
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ASF GitHub Bot commented on FLINK-9083:
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jparkie commented on issue #6782: [FLINK-9083][Cassandra Connector] Add async
backpressure support to Cassandra Connector
URL: https://github.com/apache/flink/pull/6782#issuecomment-427147368
I think post 3.0.4 the driver doesn’t block on executeAsync() when the
internal queues are full. It throws an exception instead that it is full. Thus,
as the latest driver version is 3.6.0, users can easily be using a newer
version of the driver that will fail fast instead of blocking for backpressure.
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> 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
> Assignee: Jacob Park
> Priority: Minor
> Labels: pull-request-available
>
> 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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