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https://issues.apache.org/jira/browse/FLINK-4500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16125541#comment-16125541
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Chesnay Schepler commented on FLINK-4500:
-----------------------------------------

[~mcfongtw] feel free to work on this issue, I have given you contributor 
permissions and you can now assign issues to yourself.

> Cassandra sink can lose messages
> --------------------------------
>
>                 Key: FLINK-4500
>                 URL: https://issues.apache.org/jira/browse/FLINK-4500
>             Project: Flink
>          Issue Type: Bug
>          Components: Cassandra Connector
>    Affects Versions: 1.1.0
>            Reporter: Elias Levy
>
> The problem is the same as I pointed out with the Kafka producer sink 
> (FLINK-4027).  The CassandraTupleSink's send() and CassandraPojoSink's send() 
> both send data asynchronously to Cassandra and record whether an error occurs 
> via a future callback.  But CassandraSinkBase does not implement 
> Checkpointed, so it can't stop checkpoint from happening even though the are 
> Cassandra queries in flight from the checkpoint that may fail.  If they do 
> fail, they would subsequently not be replayed when the job recovered, and 
> would thus be lost.
> In addition, 
> CassandraSinkBase's close should check whether there is a pending exception 
> and throw it, rather than silently close.  It should also wait for any 
> pending async queries to complete and check their status before closing.



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