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NIFI-8631: 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 #5102.

Signed-off-by: Peter Turcsanyi <turcsanyi@apache.org>
This commit is contained in:
Mark Payne 2021-05-26 11:34:51 -04:00 committed by Peter Turcsanyi
parent 1e6161c0aa
commit 46b1f6755c
1 changed files with 20 additions and 14 deletions
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34
nifi-nar-bundles/nifi-gcp-bundle/nifi-gcp-processors/src/main/java/org/apache/nifi/processors/gcp/pubsub/ConsumeGCPubSub.java
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@ -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);
}
}
if (!ackIds.isEmpty()) {
AcknowledgeRequest acknowledgeRequest = AcknowledgeRequest.newBuilder()
.addAllAckIds(ackIds)
.setSubscription(getSubscriptionName(context))
.build();
subscriber.acknowledgeCallable().call(acknowledgeRequest);
}
session.commitAsync(() -> acknowledgeAcks(ackIds, subscriptionName));
}
private String getSubscriptionName(ProcessContext context) {
private void acknowledgeAcks(final Collection<String> ackIds, final String subscriptionName) {
if (ackIds == null || ackIds.isEmpty()) {
return;
}
AcknowledgeRequest acknowledgeRequest = AcknowledgeRequest.newBuilder()
.addAllAckIds(ackIds)
.setSubscription(subscriptionName)
.build();
subscriber.acknowledgeCallable().call(acknowledgeRequest);
}
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();