/**
* Called when new data arrives to the sink, and forwards it to Kafka.
*
* @param next The incoming data
*/
@Override
public void invoke(IN next) throws Exception {
// propagate asynchronous errors
checkErroneous();
byte[] serializedKey = schema.serializeKey(next);
byte[] serializedValue = schema.serializeValue(next);
String targetTopic = schema.getTargetTopic(next);
if (targetTopic == null) {
targetTopic = defaultTopicId;
}
ProducerRecord<byte[], byte[]> record;
if (partitioner == null) {
record = new ProducerRecord<>(targetTopic, serializedKey, serializedValue);
} else {
record =
new ProducerRecord<>(
targetTopic,
partitioner.partition(next, serializedKey, serializedValue, partitions.length),
serializedKey,
serializedValue);
}
if (flushOnCheckpoint) {
synchronized (pendingRecordsLock) {
pendingRecords++;
}
}
producer.send(record, callback);
}
/** Initializes the connection to Kafka. */
@Override
public void open(Configuration configuration) {
producer = getKafkaProducer(this.producerConfig);
RuntimeContext ctx = getRuntimeContext();
if (partitioner != null) {
partitioner.open(ctx.getIndexOfThisSubtask(), ctx.getNumberOfParallelSubtasks(), partitions);
}
LOG.info(
"Starting FlinkKafkaProducer ({}/{}) to produce into topic {}",
ctx.getIndexOfThisSubtask(),
ctx.getNumberOfParallelSubtasks(),
defaultTopicId);
// register Kafka metrics to Flink accumulators
if (!Boolean.valueOf(producerConfig.getProperty(KEY_DISABLE_METRICS, "false"))) {
Map<MetricName, ? extends Metric> metrics = this.producer.metrics();
if (metrics == null) {
// MapR's Kafka implementation returns null here.
LOG.info("Producer implementation does not support metrics");
} else {
for (Map.Entry<MetricName, ? extends Metric> metric : metrics.entrySet()) {
String name = producerId + "-producer-" + metric.getKey().name();
DefaultKafkaMetricAccumulator kafkaAccumulator =
DefaultKafkaMetricAccumulator.createFor(metric.getValue());
// best effort: we only add the accumulator if available.
if (kafkaAccumulator != null) {
getRuntimeContext().addAccumulator(name, kafkaAccumulator);
}
}
}
}
if (flushOnCheckpoint
&& !((StreamingRuntimeContext) this.getRuntimeContext()).isCheckpointingEnabled()) {
LOG.warn(
"Flushing on checkpoint is enabled, but checkpointing is not enabled. Disabling flushing.");
flushOnCheckpoint = false;
}
if (flushOnCheckpoint) {
pendingRecordsLock = new Object();
}
if (logFailuresOnly) {
callback =
new Callback() {
@Override
public void onCompletion(RecordMetadata metadata, Exception e) {
if (e != null) {
LOG.error("Error while sending record to Kafka: " + e.getMessage(), e);
}
acknowledgeMessage();
}
};
} else {
callback =
new Callback() {
@Override
public void onCompletion(RecordMetadata metadata, Exception exception) {
if (exception != null && asyncException == null) {
asyncException = exception;
}
acknowledgeMessage();
}
};
}
}
