Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/2183#discussion_r69163543 --- Diff: flink-streaming-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/streaming/connectors/cassandra/CassandraTupleWriteAheadSink.java --- @@ -110,11 +92,25 @@ public void close() throws Exception { } @Override - protected void sendValues(Iterable<IN> values, long timestamp) throws Exception { - //verify that no query failed until now - if (exception != null) { - throw new Exception(exception); - } + protected boolean sendValues(Iterable<IN> values, long timestamp) throws Exception { + int updatesSent = 0; + final AtomicInteger updatesConfirmed = new AtomicInteger(0); + + final AtomicContainer<Throwable> exception = new AtomicContainer<>(); + + FutureCallback<ResultSet> callback = new FutureCallback<ResultSet>() { + @Override + public void onSuccess(ResultSet resultSet) { + updatesConfirmed.incrementAndGet(); + } + + @Override + public void onFailure(Throwable throwable) { + exception.set(throwable); --- End diff -- i don't think it matters too much, as long as _some_ exception is noticed. The first exception would probably be the most reasonable approach though.
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