Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/419#discussion_r62906770
--- Diff:
nifi-nar-bundles/nifi-site-to-site-reporting-bundle/nifi-site-to-site-reporting-task/src/main/java/org/apache/nifi/reporting/SiteToSiteProvenanceReportingTask.java
---
@@ -0,0 +1,354 @@
+/*
+ * 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
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.nifi.reporting;
+
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.components.state.StateManager;
+import org.apache.nifi.controller.status.PortStatus;
+import org.apache.nifi.controller.status.ProcessGroupStatus;
+import org.apache.nifi.controller.status.ProcessorStatus;
+import org.apache.nifi.controller.status.RemoteProcessGroupStatus;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.provenance.ProvenanceEventRecord;
+import org.apache.nifi.remote.Transaction;
+import org.apache.nifi.remote.TransferDirection;
+
+import javax.json.Json;
+import javax.json.JsonArray;
+import javax.json.JsonArrayBuilder;
+import javax.json.JsonBuilderFactory;
+import javax.json.JsonObject;
+import javax.json.JsonObjectBuilder;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.TimeZone;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+
+@Tags({"provenance", "lineage", "tracking", "site", "site to site"})
+@CapabilityDescription("Publishes Provenance events using the Site To Site
protocol.")
+@Stateful(scopes = Scope.LOCAL, description = "Stores the Reporting Task's
last event Id so that on restart the task knows where it left off.")
+public class SiteToSiteProvenanceReportingTask extends
AbstractSiteToSiteReportingTask {
+
+ private static final String TIMESTAMP_FORMAT =
"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
+ private static final String LAST_EVENT_ID_KEY = "last_event_id";
+
+ static final PropertyDescriptor PLATFORM = new
PropertyDescriptor.Builder()
+ .name("Platform")
+ .description("The value to use for the platform field in each
provenance event.")
+ .required(true)
+ .expressionLanguageSupported(true)
+ .defaultValue("nifi")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ private volatile long firstEventId = -1L;
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ final List<PropertyDescriptor> properties = new
ArrayList<>(super.getSupportedPropertyDescriptors());
+ properties.add(PLATFORM);
+ return properties;
+ }
+
+ private String getComponentName(final ProcessGroupStatus status, final
ProvenanceEventRecord event) {
+ if (status == null) {
+ return null;
+ }
+
+ final String componentId = event.getComponentId();
+ if (status.getId().equals(componentId)) {
+ return status.getName();
+ }
+
+ for (final ProcessorStatus procStatus :
status.getProcessorStatus()) {
+ if (procStatus.getId().equals(componentId)) {
+ return procStatus.getName();
+ }
+ }
+
+ for (final PortStatus portStatus : status.getInputPortStatus()) {
+ if (portStatus.getId().equals(componentId)) {
+ return portStatus.getName();
+ }
+ }
+
+ for (final PortStatus portStatus : status.getOutputPortStatus()) {
+ if (portStatus.getId().equals(componentId)) {
+ return portStatus.getName();
+ }
+ }
+
+ for (final RemoteProcessGroupStatus rpgStatus :
status.getRemoteProcessGroupStatus()) {
+ if (rpgStatus.getId().equals(componentId)) {
+ return rpgStatus.getName();
+ }
+ }
+
+ for (final ProcessGroupStatus childGroup :
status.getProcessGroupStatus()) {
+ final String componentName = getComponentName(childGroup,
event);
+ if (componentName != null) {
+ return componentName;
+ }
+ }
+
+ return null;
+ }
+
+ @Override
+ public void onTrigger(final ReportingContext context) {
+ final ProcessGroupStatus procGroupStatus =
context.getEventAccess().getControllerStatus();
+ final String rootGroupName = procGroupStatus == null ? null :
procGroupStatus.getName();
+
+ Long currMaxId =
context.getEventAccess().getProvenanceRepository().getMaxEventId();
+
+ if(currMaxId == null) {
+ getLogger().debug("No events to send because no events have
been created yet.");
+ return;
+ }
+
+ if (firstEventId < 0) {
+ Map<String, String> state;
+ try {
+ state =
context.getStateManager().getState(Scope.LOCAL).toMap();
+ } catch (IOException e) {
+ getLogger().error("Failed to get state at start up due to
{}:"+e.getMessage(), e);
+ return;
+ }
+ if (state.containsKey(LAST_EVENT_ID_KEY)) {
+ firstEventId =
Long.parseLong(state.get(LAST_EVENT_ID_KEY)) + 1;
+ }
+
+ if(currMaxId < firstEventId){
+ getLogger().debug("Current provenance max id is {} which
is less than what was stored in state as the last queried event, which was {}.
This means the provenance restarted its " +
+ "ids. Restarting querying from the beginning.",
new Object[]{currMaxId, firstEventId});
+ firstEventId = -1;
+ }
+ }
+
+ if (currMaxId == (firstEventId - 1)) {
+ getLogger().debug("No events to send due to the current max id
being equal to the last id that was queried.");
+ return;
+ }
+
+ List<ProvenanceEventRecord> events;
+ try {
+ events =
context.getEventAccess().getProvenanceEvents(firstEventId,
context.getProperty(BATCH_SIZE).asInteger());
+ } catch (final IOException ioe) {
+ getLogger().error("Failed to retrieve Provenance Events from
repository due to: " + ioe.getMessage(), ioe);
+ return;
+ }
+
+ if (events == null || events.isEmpty()) {
+ getLogger().debug("No events to send due to 'events' being
null or empty.");
+ return;
+ }
+
+ final String nifiUrl =
context.getProperty(INSTANCE_URL).evaluateAttributeExpressions().getValue();
+ URL url;
+ try {
+ url = new URL(nifiUrl);
+ } catch (final MalformedURLException e1) {
+ // already validated
+ throw new AssertionError();
+ }
+
+ final String hostname = url.getHost();
+ final String platform =
context.getProperty(PLATFORM).evaluateAttributeExpressions().getValue();
+
+ final Map<String, ?> config = Collections.emptyMap();
+ final JsonBuilderFactory factory =
Json.createBuilderFactory(config);
+ final JsonObjectBuilder builder = factory.createObjectBuilder();
+
+ while (events != null && !events.isEmpty()) {
+ final long start = System.nanoTime();
+
+ // Create a JSON array of all the events in the current batch
+ final JsonArrayBuilder arrayBuilder =
factory.createArrayBuilder();
+ for (final ProvenanceEventRecord event : events) {
+ arrayBuilder.add(serialize(factory, builder, event,
getComponentName(procGroupStatus, event), hostname, url, rootGroupName,
platform));
+ }
+ final JsonArray jsonArray = arrayBuilder.build();
+
+ // Send the JSON document for the current batch
+ try {
+ final Transaction transaction =
getClient().createTransaction(TransferDirection.SEND);
+ if (transaction == null) {
+ getLogger().debug("All destination nodes are
penalized; will attempt to send data later");
+ return;
+ }
+
+ final Map<String, String> attributes = new HashMap<>();
+ final String transactionId = UUID.randomUUID().toString();
+ attributes.put("reporting.task.transaction.id",
transactionId);
+
+ final byte[] data =
jsonArray.toString().getBytes(StandardCharsets.UTF_8);
+ transaction.send(data, attributes);
+ transaction.confirm();
+ transaction.complete();
+
+ final long transferMillis =
TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start);
+ getLogger().info("Successfully sent {} Provenance Events
to destination in {} ms; Transaction ID = {}; First Event ID = {}",
--- End diff --
@jvwing you are correct that deleting the prov repo is what would trigger
this to occur. In that event, we don't want to stop sending data until we
generate that many events again. I'm not sure what level that log message
should be though. I could see using WARN in that case.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
