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https://issues.apache.org/jira/browse/FLINK-9083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668054#comment-16668054
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ASF GitHub Bot commented on FLINK-9083:
---------------------------------------
jparkie commented on a change in pull request #6782: [FLINK-9083][Cassandra
Connector] Add async backpressure support to Cassandra Connector
URL: https://github.com/apache/flink/pull/6782#discussion_r229162559
##########
File path: docs/dev/connectors/cassandra.md
##########
@@ -72,10 +72,13 @@ The following configuration methods can be used:
4. _setMapperOptions(MapperOptions options)_
* Sets the mapper options that are used to configure the DataStax
ObjectMapper.
* Only applies when processing __POJO__ data types.
-5. _enableWriteAheadLog([CheckpointCommitter committer])_
+5. _setMaxConcurrentRequests(int maxConcurrentRequests, long timeout, TimeUnit
unit)_
+ * Sets the maximum allowed number of concurrent requests with a timeout
for acquiring permits to execute.
+ * Only applies when __enableWriteAheadLog()__ is not configured.
Review comment:
Yeah. It was just implementation effort. I was thinking of a follow up
ticket to implement it and verify it, since the WAL version is always the
tricky one.
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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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