[GitHub] jparkie opened a new pull request #6782: [FLINK-9083][Cassandra Connector] Add async backpressure support to Cassandra Connector

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jparkie opened a new pull request #6782: [FLINK-9083][Cassandra Connector] Add async backpressure support to Cassandra Connector
URL: https://github.com/apache/flink/pull/6782
 
 
   ## What is the purpose of the change
   
   This pull requests rewrites `CassandraSinkBase` to use a `Phaser` and `Semaphore` to provide proper synchronization to support `maxConcurrentRequests` as a new configuration. This improves the reliability of the Cassandra Connector as it can currently overwhelm a weak Cassandra cluster if the upstream source has very high throughput.
   
   ## Brief change log
   
     - Rewrote `CassandraSinkBase` to use a `Phaser` and `Semaphore`.
     - Expose `public void setMaxConcurrentRequests(int maxConcurrentRequests, long timeout, TimeUnit unit)` on `CassandraSinkBase`.
     - Modify `CassandraSink` with the new configuration. It currently does not support the WAL.
     - Updated the documentation about the new configuration.
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as `CassandraSinkBaseTest` and `CassandraConnectorITCase`.
   
   This change added tests and can be verified as follows:
   
     - Added tests for acquiring permits from the `Semaphore` and releasing permits from the `Semaphore` when a write succeeds or fails.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? yes
     - If yes, how is the feature documented? docs / JavaDocs
   

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