Ensure that GCP Pub/Sub messages are not acknowledged until session has been committed, in order ot ensure that we don't have data loss
This closes
@@ -45,6 +45,7 @@ import org.apache.nifi.processor.util.StandardValidators;
import java.io.IOException;
import java.util.ArrayList;
+import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
@@ -130,11 +131,10 @@ public class ConsumeGCPubSub extends AbstractGCPubSubProcessor {
}
@Override
- public void onTrigger(ProcessContext context, ProcessSession session) throws ProcessException {
+ public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException {
if (subscriber == null) {
-
if (storedException.get() != null) {
- getLogger().error("Failed to create Google Cloud PubSub subscriber due to {}", new Object[]{storedException.get()});
+ getLogger().error("Failed to create Google Cloud PubSub subscriber due to {}", storedException.get());
} else {
getLogger().error("Google Cloud PubSub Subscriber was not properly created. Yielding the processor...");
}
@@ -145,6 +145,7 @@ public class ConsumeGCPubSub extends AbstractGCPubSubProcessor {
final PullResponse pullResponse = subscriber.pullCallable().call(pullRequest);
final List<String> ackIds = new ArrayList<>();
+ final String subscriptionName = getSubscriptionName(context);
for (ReceivedMessage message : pullResponse.getReceivedMessagesList()) {
if (message.hasMessage()) {
@@ -164,20 +165,26 @@ public class ConsumeGCPubSub extends AbstractGCPubSubProcessor {
flowFile = session.write(flowFile, out -> out.write(message.getMessage().getData().toByteArray()));
session.transfer(flowFile, REL_SUCCESS);
- session.getProvenanceReporter().receive(flowFile, getSubscriptionName(context));
+ session.getProvenanceReporter().receive(flowFile, subscriptionName);
+ }
}
+
+ session.commitAsync(() -> acknowledgeAcks(ackIds, subscriptionName));
+ }
+
+ private void acknowledgeAcks(final Collection<String> ackIds, final String subscriptionName) {
+ if (ackIds == null || ackIds.isEmpty()) {
+ return;
}
- if (!ackIds.isEmpty()) {
AcknowledgeRequest acknowledgeRequest = AcknowledgeRequest.newBuilder()
.addAllAckIds(ackIds)
- .setSubscription(getSubscriptionName(context))
+ .setSubscription(subscriptionName)
.build();
subscriber.acknowledgeCallable().call(acknowledgeRequest);
}
- }
- private String getSubscriptionName(ProcessContext context) {
+ private String getSubscriptionName(final ProcessContext context) {
final String subscriptionName = context.getProperty(SUBSCRIPTION).evaluateAttributeExpressions().getValue();
final String projectId = context.getProperty(PROJECT_ID).evaluateAttributeExpressions().getValue();
@@ -189,8 +196,7 @@ public class ConsumeGCPubSub extends AbstractGCPubSubProcessor {
}
- private SubscriberStub getSubscriber(ProcessContext context) throws IOException {
-
+ private SubscriberStub getSubscriber(final ProcessContext context) throws IOException {
final SubscriberStubSettings subscriberStubSettings = SubscriberStubSettings.newBuilder()
.setCredentialsProvider(FixedCredentialsProvider.create(getGoogleCredentials(context)))
.build();
