mosermw commented on code in PR #9476: URL: https://github.com/apache/nifi/pull/9476#discussion_r1904622470
########## nifi-extension-bundles/nifi-standard-bundle/nifi-standard-rules/src/main/java/org/apache/nifi/flowanalysis/rules/RestrictBackpressureSettings.java: ########## @@ -0,0 +1,242 @@ +/* + * 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.flowanalysis.rules; + +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.ValidationContext; +import org.apache.nifi.components.ValidationResult; +import org.apache.nifi.flow.VersionedComponent; +import org.apache.nifi.flow.VersionedConnection; +import org.apache.nifi.flow.VersionedProcessGroup; +import org.apache.nifi.flow.VersionedProcessor; +import org.apache.nifi.flowanalysis.AbstractFlowAnalysisRule; +import org.apache.nifi.flowanalysis.FlowAnalysisRuleContext; +import org.apache.nifi.flowanalysis.GroupAnalysisResult; +import org.apache.nifi.processor.DataUnit; +import org.apache.nifi.processor.util.StandardValidators; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.function.Function; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +@Tags({"connection", "backpressure"}) +@CapabilityDescription("This rule will generate a violation if backpressure settings of a connection exceed configured thresholds. " + + "Improper configuration of backpressure settings can lead to decreased performances because of excessive swapping as well as " + + "to filled up content repository with too much in-flight data in NiFi.") +public class RestrictBackpressureSettings extends AbstractFlowAnalysisRule { + + public static final PropertyDescriptor COUNT_MIN = new PropertyDescriptor.Builder() + .name("Minimum Backpressure Object Count Threshold") + .description("This is the minimum value that should be set for the Object Count backpressure setting on connections. " + + "This can be used to prevent a user from setting a value of 0 which disables backpressure based on count.") + .required(true) + .addValidator(StandardValidators.POSITIVE_LONG_VALIDATOR) + .defaultValue("1") + .build(); + + public static final PropertyDescriptor COUNT_MAX = new PropertyDescriptor.Builder() + .name("Maximum Backpressure Object Count Threshold") + .description("This is the maximum value that should be set for the Object Count backpressure setting on connections. " + + "This can be used to prevent a user from setting a very high value that may be leading to a lot of swapping.") + .required(true) + .addValidator(StandardValidators.POSITIVE_LONG_VALIDATOR) + .defaultValue("10000") + .build(); + + public static final PropertyDescriptor SIZE_MIN = new PropertyDescriptor.Builder() + .name("Minimum Backpressure Data Size Threshold") + .description("This is the minimum value that should be set for the Data Size backpressure setting on connections. " + + "This can be used to prevent a user from setting a value of 0 which disables backpressure based on size.") + .required(true) + .addValidator(StandardValidators.DATA_SIZE_VALIDATOR) + .defaultValue("1 MB") + .build(); + + public static final PropertyDescriptor SIZE_MAX = new PropertyDescriptor.Builder() + .name("Maximum Backpressure Data Size Threshold") + .description("This is the maximum value that should be set for the Data Size backpressure setting on connections. " + + "This can be used to prevent a user from setting a very high value that may be filling up the content repo.") + .required(true) + .addValidator(StandardValidators.DATA_SIZE_VALIDATOR) + .defaultValue("1 GB") + .build(); + + private static final List<PropertyDescriptor> PROPERTIES = List.of( + COUNT_MIN, + COUNT_MAX, + SIZE_MIN, + SIZE_MAX + ); + + @Override + protected Collection<ValidationResult> customValidate(ValidationContext validationContext) { + final List<ValidationResult> results = new ArrayList<ValidationResult>(); + + final long minCount = validationContext.getProperty(COUNT_MIN).asLong(); + final long maxCount = validationContext.getProperty(COUNT_MAX).asLong(); + final double minSize = validationContext.getProperty(SIZE_MIN).asDataSize(DataUnit.B); + final double maxSize = validationContext.getProperty(SIZE_MAX).asDataSize(DataUnit.B); + + if (minCount > maxCount) { + results.add( + new ValidationResult.Builder() + .subject(COUNT_MIN.getName()) + .valid(false) + .explanation("Value of '" + COUNT_MIN.getName() + "' cannot be strictly greater than '" + COUNT_MAX.getName() + "'") + .build()); + } + if (Double.compare(minSize, maxSize) > 0) { + results.add( + new ValidationResult.Builder() + .subject(SIZE_MIN.getName()) + .valid(false) + .explanation("Value of '" + SIZE_MIN.getName() + "' cannot be strictly greater than '" + SIZE_MAX.getName() + "'") + .build()); + } + + return results; + } + + @Override + protected List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return PROPERTIES; + } + + @Override + public Collection<GroupAnalysisResult> analyzeProcessGroup(VersionedProcessGroup pg, FlowAnalysisRuleContext context) { + final Collection<GroupAnalysisResult> results = new HashSet<GroupAnalysisResult>(); + + final long minCount = context.getProperty(COUNT_MIN).asLong(); + final long maxCount = context.getProperty(COUNT_MAX).asLong(); + final double minSize = context.getProperty(SIZE_MIN).asDataSize(DataUnit.B); + final double maxSize = context.getProperty(SIZE_MAX).asDataSize(DataUnit.B); + + // Map of all id/components to generate more human readable violations + final Map<String, VersionedComponent> idComponent = Stream.of( + pg.getFunnels().stream(), + pg.getProcessors().stream(), + pg.getInputPorts().stream(), + pg.getOutputPorts().stream() + ).flatMap(c -> c) + .collect(Collectors.toMap(c -> c.getIdentifier(), Function.identity())); + + pg.getConnections().stream().forEach( + connection -> { + if (connection.getBackPressureObjectThreshold() < minCount) { + results.add(buildViolation(connection, + idComponent.get(connection.getSource().getId()), + idComponent.get(connection.getDestination().getId()), + BackpressureViolationType.BP_COUNT_THRESHOLD_BELOW_LIMIT, + getViolationMessage(BackpressureViolationType.BP_COUNT_THRESHOLD_BELOW_LIMIT, connection.getBackPressureObjectThreshold().toString(), Long.toString(minCount)))); + } + if (connection.getBackPressureObjectThreshold() > maxCount) { + results.add(buildViolation(connection, + idComponent.get(connection.getSource().getId()), + idComponent.get(connection.getDestination().getId()), + BackpressureViolationType.BP_COUNT_THRESHOLD_ABOVE_LIMIT, + getViolationMessage(BackpressureViolationType.BP_COUNT_THRESHOLD_ABOVE_LIMIT, connection.getBackPressureObjectThreshold().toString(), Long.toString(maxCount)))); + } + final double sizeThreshold = DataUnit.parseDataSize(connection.getBackPressureDataSizeThreshold(), DataUnit.B); + if (Double.compare(sizeThreshold, minSize) < 0) { + results.add(buildViolation(connection, + idComponent.get(connection.getSource().getId()), + idComponent.get(connection.getDestination().getId()), + BackpressureViolationType.BP_SIZE_THRESHOLD_BELOW_LIMIT, + getViolationMessage(BackpressureViolationType.BP_SIZE_THRESHOLD_BELOW_LIMIT, connection.getBackPressureDataSizeThreshold(), context.getProperty(SIZE_MIN).getValue()))); + } + if (Double.compare(sizeThreshold, maxSize) > 0) { + results.add(buildViolation(connection, + idComponent.get(connection.getSource().getId()), + idComponent.get(connection.getDestination().getId()), + BackpressureViolationType.BP_SIZE_THRESHOLD_ABOVE_LIMIT, + getViolationMessage(BackpressureViolationType.BP_SIZE_THRESHOLD_ABOVE_LIMIT, connection.getBackPressureDataSizeThreshold(), context.getProperty(SIZE_MAX).getValue()))); + } + } + ); + + return results; + } + + private GroupAnalysisResult buildViolation(final VersionedConnection connection, final VersionedComponent source, + final VersionedComponent destination, final BackpressureViolationType backpressureViolationType, final String violationMessage) { + if (!(source instanceof VersionedProcessor) && !(destination instanceof VersionedProcessor)) { + // connection between two components that are not processors and cannot be invalid, setting violation on connection + return GroupAnalysisResult.forComponent(connection, + connection.getIdentifier() + "_" + backpressureViolationType.getId(), + getLocationMessage(connection, source, destination) + violationMessage).build(); + } else if (source instanceof VersionedProcessor) { + // defining violation on source processor + return GroupAnalysisResult.forComponent(source, + connection.getIdentifier() + "_" + backpressureViolationType.getId(), + getLocationMessage(connection, source, destination) + violationMessage).build(); + } else { + // defining violation on destination processor + return GroupAnalysisResult.forComponent(destination, + connection.getIdentifier() + "_" + backpressureViolationType.getId(), + getLocationMessage(connection, source, destination) + violationMessage).build(); + } + } + + private String getLocationMessage(final VersionedConnection connection, final VersionedComponent source, final VersionedComponent destination) { + if (source == null || destination == null) { + return "The connection [" + connection.getIdentifier() + "] is violating the rule for backpressure settings. "; + } + return "The connection [" + connection.getIdentifier() + "] connecting " + source.getName() + " [" + source.getIdentifier() + "] to " + + destination.getName() + " [" + destination.getIdentifier() + "] is violating the rule for backpressure settings. "; + } + + private String getViolationMessage(final BackpressureViolationType backpressureViolationType, final String configured, final String limit) { + switch (backpressureViolationType) { Review Comment: This switch statement looks like a candidate for using enhanced switch and removing the default case that isn't needed for switching over an Enum. ``` return switch (backpressureViolationType) { case BP_COUNT_THRESHOLD_ABOVE_LIMIT -> "blah"; case BP_COUNT_THRESHOLD_BELOW_LIMIT -> "blah"; case BP_SIZE_THRESHOLD_ABOVE_LIMIT -> "blah"; case BP_SIZE_THRESHOLD_BELOW_LIMIT -> "blah"; }; ``` -- This is an automated message from the Apache Git Service. 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