echauchot commented on code in PR #19680:
URL: https://github.com/apache/flink/pull/19680#discussion_r888836440
##########
flink-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/batch/connectors/cassandra/CassandraOutputFormatBase.java:
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@@ -17,130 +17,160 @@
package org.apache.flink.batch.connectors.cassandra;
+import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.api.common.io.RichOutputFormat;
import org.apache.flink.configuration.Configuration;
+import org.apache.flink.connectors.cassandra.utils.SinkUtils;
import org.apache.flink.streaming.connectors.cassandra.ClusterBuilder;
import org.apache.flink.util.Preconditions;
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.base.Strings;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
+import java.time.Duration;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.atomic.AtomicReference;
/**
- * CassandraOutputFormatBase is the common abstract class for writing into
Apache Cassandra.
+ * CassandraOutputFormatBase is the common abstract class for writing into
Apache Cassandra using
+ * output formats.
*
* @param <OUT> Type of the elements to write.
*/
-public abstract class CassandraOutputFormatBase<OUT> extends
RichOutputFormat<OUT> {
+public abstract class CassandraOutputFormatBase<OUT, V> extends
RichOutputFormat<OUT> {
private static final Logger LOG =
LoggerFactory.getLogger(CassandraOutputFormatBase.class);
- private final String insertQuery;
private final ClusterBuilder builder;
+ private Semaphore semaphore;
+ private Duration maxConcurrentRequestsTimeout =
Duration.ofMillis(Long.MAX_VALUE);
+ private int maxConcurrentRequests = Integer.MAX_VALUE;
private transient Cluster cluster;
- private transient Session session;
- private transient PreparedStatement prepared;
- private transient FutureCallback<ResultSet> callback;
- private transient Throwable exception = null;
-
- public CassandraOutputFormatBase(String insertQuery, ClusterBuilder
builder) {
- Preconditions.checkArgument(
- !Strings.isNullOrEmpty(insertQuery), "Query cannot be null or
empty");
+ protected transient Session session;
+ private transient FutureCallback<V> callback;
+ private AtomicReference<Throwable> throwable;
+
+ public CassandraOutputFormatBase(
+ ClusterBuilder builder,
+ int maxConcurrentRequests,
+ Duration maxConcurrentRequestsTimeout) {
Preconditions.checkNotNull(builder, "Builder cannot be null");
-
- this.insertQuery = insertQuery;
this.builder = builder;
+ Preconditions.checkArgument(
+ maxConcurrentRequests > 0, "Max concurrent requests is
expected to be positive");
+ this.maxConcurrentRequests = maxConcurrentRequests;
+ Preconditions.checkNotNull(
+ maxConcurrentRequestsTimeout, "Max concurrent requests timeout
cannot be null");
+ Preconditions.checkArgument(
+ !maxConcurrentRequestsTimeout.isNegative(),
+ "Max concurrent requests timeout is expected to be positive");
+ this.maxConcurrentRequestsTimeout = maxConcurrentRequestsTimeout;
}
+ /** Configure the connection to Cassandra. */
@Override
public void configure(Configuration parameters) {
this.cluster = builder.getCluster();
}
- /**
- * Opens a Session to Cassandra and initializes the prepared statement.
- *
- * @param taskNumber The number of the parallel instance.
- * @throws IOException Thrown, if the output could not be opened due to an
I/O problem.
- */
+ /** Opens a Session to Cassandra . */
@Override
public void open(int taskNumber, int numTasks) throws IOException {
+ throwable = new AtomicReference<>();
+ this.semaphore = new Semaphore(maxConcurrentRequests);
this.session = cluster.connect();
Review Comment:
done.
I introduced `OutputFormatBase` that has no Cassandra dependencies and that
contains only flush and max concurrent requests features. This class is for now
in cassandra module waiting for the above promotion decision. The introduction
of this class is isolated in commit a3323a1b to ease a cherrypick in case we do
a separate PR to address https://issues.apache.org/jira/browse/FLINK-27884
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