Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/1771#discussion_r58561402
--- Diff:
flink-streaming-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/streaming/connectors/cassandra/CassandraTupleWriteAheadSink.java
---
@@ -0,0 +1,136 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.BoundStatement;
+import com.datastax.driver.core.Cluster;
+import com.datastax.driver.core.PreparedStatement;
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.ResultSetFuture;
+import com.datastax.driver.core.Session;
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.java.ClosureCleaner;
+import org.apache.flink.api.java.tuple.Tuple;
+import org.apache.flink.api.java.typeutils.runtime.TupleSerializer;
+import org.apache.flink.streaming.runtime.operators.CheckpointCommitter;
+import org.apache.flink.streaming.runtime.operators.GenericAtLeastOnceSink;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Sink that emits its input elements into a Cassandra database. This sink
stores incoming records within a
+ * {@link org.apache.flink.runtime.state.AbstractStateBackend}, and only
commits them to cassandra
+ * if a checkpoint is completed.
+ *
+ * @param <IN> Type of the elements emitted by this sink
+ */
+public class CassandraTupleWriteAheadSink<IN extends Tuple> extends
GenericAtLeastOnceSink<IN> {
+ protected transient Cluster cluster;
+ protected transient Session session;
+
+ private final String insertQuery;
+ private transient PreparedStatement preparedStatement;
+
+ private transient Throwable exception = null;
+ private transient FutureCallback<ResultSet> callback;
+
+ private ClusterBuilder builder;
+
+ private int updatesSent = 0;
+ private AtomicInteger updatesConfirmed = new AtomicInteger(0);
+
+ private transient Object[] fields;
+
+ protected CassandraTupleWriteAheadSink(String insertQuery,
TypeSerializer<IN> serializer, ClusterBuilder builder, String jobID,
CheckpointCommitter committer) throws Exception {
+ super(committer, serializer, jobID);
+ this.insertQuery = insertQuery;
+ this.builder = builder;
+ ClosureCleaner.clean(builder, true);
+ }
+
+ public void open() throws Exception {
+ super.open();
+ if (!getRuntimeContext().isCheckpointingEnabled()) {
+ throw new IllegalStateException("The write-ahead log
requires checkpointing to be enabled.");
+ }
+ this.callback = new FutureCallback<ResultSet>() {
+ @Override
+ public void onSuccess(ResultSet resultSet) {
+ updatesConfirmed.incrementAndGet();
+ }
+
+ @Override
+ public void onFailure(Throwable throwable) {
+ exception = throwable;
--- End diff --
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