Github user ijokarumawak commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2335#discussion_r157219892
--- Diff:
nifi-nar-bundles/nifi-atlas-bundle/nifi-atlas-reporting-task/src/main/java/org/apache/nifi/atlas/provenance/StandardAnalysisContext.java
---
@@ -0,0 +1,136 @@
+/*
+ * 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.atlas.provenance;
+
+import org.apache.nifi.atlas.NiFiFlow;
+import org.apache.nifi.atlas.resolver.ClusterResolver;
+import org.apache.nifi.authorization.user.NiFiUser;
+import org.apache.nifi.controller.status.ConnectionStatus;
+import org.apache.nifi.provenance.ProvenanceEventRecord;
+import org.apache.nifi.provenance.ProvenanceRepository;
+import org.apache.nifi.provenance.lineage.ComputeLineageResult;
+import org.apache.nifi.provenance.lineage.ComputeLineageSubmission;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+public class StandardAnalysisContext implements AnalysisContext {
+
+ private final Logger logger =
LoggerFactory.getLogger(StandardAnalysisContext.class);
+ private final NiFiFlow nifiFlow;
+ private final ClusterResolver clusterResolver;
+ private final ProvenanceRepository provenanceRepository;
+
+ public StandardAnalysisContext(NiFiFlow nifiFlow, ClusterResolver
clusterResolver,
+ ProvenanceRepository
provenanceRepository) {
+ this.nifiFlow = nifiFlow;
+ this.clusterResolver = clusterResolver;
+ this.provenanceRepository = provenanceRepository;
+ }
+
+ @Override
+ public List<ConnectionStatus> findConnectionTo(String componentId) {
+ return nifiFlow.getIncomingRelationShips(componentId);
+ }
+
+ @Override
+ public List<ConnectionStatus> findConnectionFrom(String componentId) {
+ return nifiFlow.getOutgoingRelationShips(componentId);
+ }
+
+ @Override
+ public String getNiFiClusterName() {
+ return nifiFlow.getClusterName();
+ }
+
+ @Override
+ public ClusterResolver getClusterResolver() {
+ return clusterResolver;
+ }
+
+ private ComputeLineageResult getLineageResult(long eventId,
ComputeLineageSubmission submission) {
+ final ComputeLineageResult result = submission.getResult();
+ try {
+ if (result.awaitCompletion(10, TimeUnit.SECONDS)) {
--- End diff --
I agree on that this can be a costly operation. The reason to query
provenance is to compute a lineage from a DROP provenance event. This is used
by 'Complete Path' strategy. I wrote documentation on performance impact. If
this does not work for a use-case, then user can choose another strategy,
'Simple Path'. Simple Path does not query provenance events this way. It
analyzes each individual event, so should be more lightweight.
---
