Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/1771#discussion_r58561096
--- Diff:
flink-streaming-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/streaming/connectors/cassandra/CassandraSinkBase.java
---
@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.connectors.cassandra;
+
+import com.datastax.driver.core.Cluster;
+import com.datastax.driver.core.Session;
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import org.apache.flink.api.java.ClosureCleaner;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+
+/**
+ * CassandraSinkBase is the common abstract class of {@link
CassandraPojoSink} and {@link CassandraTupleSink}.
+ *
+ * @param <IN> Type of the elements emitted by this sink
+ */
+public abstract class CassandraSinkBase<IN, V> extends
RichSinkFunction<IN> {
+ protected static final Logger LOG =
LoggerFactory.getLogger(CassandraSinkBase.class);
+ protected transient Cluster cluster;
+ protected transient Session session;
+
+ protected transient Throwable exception = null;
+ protected transient FutureCallback<V> callback;
+
+ private final ClusterBuilder builder;
+
+ protected CassandraSinkBase(ClusterBuilder builder) {
+ this.builder = builder;
+ ClosureCleaner.clean(builder, true);
+ }
+
+ @Override
+ public void open(Configuration configuration) {
+ this.callback = new FutureCallback<V>() {
+ @Override
+ public void onSuccess(V ignored) {
+ }
+
+ @Override
+ public void onFailure(Throwable t) {
+ exception = t;
--- End diff --
Can you log the exception as well. Maybe invoke() is never called after the
failure and nobody knows what's going on
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