MikeThomsen commented on a change in pull request #4646: URL: https://github.com/apache/nifi/pull/4646#discussion_r817134950
########## File path: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/DeduplicateRecords.java ########## @@ -0,0 +1,690 @@ +/* + * 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.processors.standard; + +import com.google.common.base.Joiner; +import com.google.common.hash.BloomFilter; +import com.google.common.hash.Funnels; +import org.apache.commons.codec.binary.Hex; +import org.apache.commons.codec.digest.DigestUtils; +import org.apache.commons.codec.digest.MessageDigestAlgorithms; +import org.apache.nifi.annotation.behavior.DynamicProperty; +import org.apache.nifi.annotation.behavior.EventDriven; +import org.apache.nifi.annotation.behavior.InputRequirement; +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement; +import org.apache.nifi.annotation.behavior.SupportsBatching; +import org.apache.nifi.annotation.behavior.SystemResource; +import org.apache.nifi.annotation.behavior.SystemResourceConsideration; +import org.apache.nifi.annotation.behavior.WritesAttribute; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.SeeAlso; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnScheduled; +import org.apache.nifi.components.AllowableValue; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.PropertyValue; +import org.apache.nifi.components.ValidationContext; +import org.apache.nifi.components.ValidationResult; +import org.apache.nifi.components.Validator; +import org.apache.nifi.distributed.cache.client.DistributedMapCacheClient; +import org.apache.nifi.distributed.cache.client.Serializer; +import org.apache.nifi.expression.ExpressionLanguageScope; +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.flowfile.attributes.CoreAttributes; +import org.apache.nifi.logging.ComponentLog; +import org.apache.nifi.processor.AbstractProcessor; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.ProcessorInitializationContext; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.processor.util.StandardValidators; +import org.apache.nifi.record.path.FieldValue; +import org.apache.nifi.record.path.RecordPath; +import org.apache.nifi.record.path.RecordPathResult; +import org.apache.nifi.record.path.util.RecordPathCache; +import org.apache.nifi.record.path.validation.RecordPathPropertyNameValidator; +import org.apache.nifi.record.path.validation.RecordPathValidator; +import org.apache.nifi.serialization.RecordReader; +import org.apache.nifi.serialization.RecordReaderFactory; +import org.apache.nifi.serialization.RecordSetWriter; +import org.apache.nifi.serialization.RecordSetWriterFactory; +import org.apache.nifi.serialization.WriteResult; +import org.apache.nifi.serialization.record.Record; +import org.apache.nifi.serialization.record.RecordSchema; +import org.apache.nifi.serialization.record.util.DataTypeUtils; + +import java.io.IOException; +import java.io.InputStream; +import java.io.OutputStream; +import java.io.Serializable; +import java.nio.charset.Charset; +import java.nio.charset.StandardCharsets; +import java.security.MessageDigest; +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.stream.Collectors; + +import static java.util.stream.Collectors.toList; +import static org.apache.commons.codec.binary.StringUtils.getBytesUtf8; + +@EventDriven +@SupportsBatching +@InputRequirement(Requirement.INPUT_REQUIRED) +@SystemResourceConsideration(resource = SystemResource.MEMORY, + description = "The HashSet filter type will grow memory space proportionate to the number of unique records processed. " + + "The BloomFilter type will use constant memory regardless of the number of records processed.") +@SystemResourceConsideration(resource = SystemResource.CPU, + description = "If a more advanced hash algorithm is chosen, the amount of time required to hash any particular " + + "record could increase substantially." +) +@Tags({"text", "record", "update", "change", "replace", "modify", "distinct", "unique", + "filter", "hash", "dupe", "duplicate", "dedupe"}) +@CapabilityDescription("This processor attempts to deduplicate a record set in memory using either a hashset or a bloom filter. " + + "It operates on a per-file basis rather than across an entire data set that spans multiple files.") +@WritesAttribute(attribute = "record.count", description = "The number of records processed.") +@DynamicProperty( + name = "RecordPath", + value = "An expression language statement used to determine how the RecordPath is resolved. " + + "The following variables are availible: ${field.name}, ${field.value}, ${field.type}", + description = "The name of each user-defined property must be a valid RecordPath.") +@SeeAlso(classNames = { + "org.apache.nifi.distributed.cache.client.DistributedMapCacheClientService", + "org.apache.nifi.distributed.cache.server.map.DistributedMapCacheServer", + "org.apache.nifi.processors.standard.DetectDuplicate" +}) +public class DeduplicateRecords extends AbstractProcessor { + + private static final String FIELD_NAME = "field.name"; + private static final String FIELD_VALUE = "field.value"; + private static final String FIELD_TYPE = "field.type"; + + private volatile RecordPathCache recordPathCache; + private volatile List<String> recordPaths; + + // VALUES + + static final AllowableValue NONE_ALGORITHM_VALUE = new AllowableValue("none", "None", + "Do not use a hashing algorithm. The value of resolved RecordPaths will be combined with tildes (~) to form the unique record key. " + + "This may use significantly more storage depending on the size and shape or your data."); + static final AllowableValue MD5_ALGORITHM_VALUE = new AllowableValue(MessageDigestAlgorithms.MD5, "MD5", + "The MD5 message-digest algorithm."); + static final AllowableValue SHA1_ALGORITHM_VALUE = new AllowableValue(MessageDigestAlgorithms.SHA_1, "SHA-1", + "The SHA-1 cryptographic hash algorithm."); + static final AllowableValue SHA256_ALGORITHM_VALUE = new AllowableValue(MessageDigestAlgorithms.SHA3_256, "SHA-256", + "The SHA-256 cryptographic hash algorithm."); + static final AllowableValue SHA512_ALGORITHM_VALUE = new AllowableValue(MessageDigestAlgorithms.SHA3_512, "SHA-512", + "The SHA-512 cryptographic hash algorithm."); + + static final AllowableValue HASH_SET_VALUE = new AllowableValue("hash-set", "HashSet", + "Exactly matches records seen before with 100% accuracy at the expense of more storage usage. " + + "Stores the filter data in a single cache entry in the distributed cache, and is loaded entirely into memory during duplicate detection. " + + "This filter is preferred for small to medium data sets and offers high performance loaded into memory when this processor is running."); + static final AllowableValue BLOOM_FILTER_VALUE = new AllowableValue("bloom-filter", "BloomFilter", + "Space-efficient data structure ideal for large data sets using probability to determine if a record was seen previously. " + + "False positive matches are possible, but false negatives are not – in other words, a query returns either \"possibly in the set\" or \"definitely not in the set\". " + + "You should use this option if the FlowFile content is large and you can tolerate some duplication in the data. Uses constant storage space regardless of the record set size."); + + // PROPERTIES + + static final PropertyDescriptor RECORD_READER = new PropertyDescriptor.Builder() + .name("record-reader") + .displayName("Record Reader") + .description("Specifies the Controller Service to use for reading incoming data") + .identifiesControllerService(RecordReaderFactory.class) + .required(true) + .build(); + + static final PropertyDescriptor RECORD_WRITER = new PropertyDescriptor.Builder() + .name("record-writer") + .displayName("Record Writer") + .description("Specifies the Controller Service to use for writing out the records") + .identifiesControllerService(RecordSetWriterFactory.class) + .required(true) + .build(); + + static final AllowableValue OPTION_SINGLE_FILE = new AllowableValue("single", "Single File"); + static final AllowableValue OPTION_MULTIPLE_FILES = new AllowableValue("multiple", "Multiple Files"); + + static final PropertyDescriptor DEDUPLICATION_STRATEGY = new PropertyDescriptor.Builder() + .name("deduplication-strategy") + .displayName("Deduplication Strategy") + .description("The strategy to use for detecting and isolating duplicate records. The option for doing it " + + "across a single data file will operate in memory, whereas the one for going across the enter repository " + + "will require a distributed map cache.") + .allowableValues(OPTION_SINGLE_FILE, OPTION_MULTIPLE_FILES) + .defaultValue(OPTION_SINGLE_FILE.getValue()) + .required(true) + .build(); + + static final PropertyDescriptor DISTRIBUTED_MAP_CACHE = new PropertyDescriptor.Builder() + .name("distributed-map-cache") + .displayName("Distributed Map Cache client") + .description("This configuration is required when the deduplication strategy is set to 'multiple files.' The map " + + "cache will be used to check a data source such as HBase or Redis for entries indicating that a record has " + + "been processed before. This option requires a downstream process that uses PutDistributedMapCache to write " + + "an entry to the cache data source once the record has been processed to indicate that it has been handled before.") + .identifiesControllerService(DistributedMapCacheClient.class) + .required(false) + .addValidator(Validator.VALID) + .dependsOn(DEDUPLICATION_STRATEGY, OPTION_MULTIPLE_FILES) + .build(); + + static final PropertyDescriptor CACHE_IDENTIFIER = new PropertyDescriptor.Builder() + .name("cache-identifier") + .displayName("Cache Identifier") + .description("This option defines a record path operation to use for defining the cache identifier. It can be used " + + "in addition to the hash settings. This field will have the expression language attribute \"record.hash.value\" " + + "available to it to use with it to generate the record path operation.") + .expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES) + .required(false) + .addValidator(Validator.VALID) + .dependsOn(DEDUPLICATION_STRATEGY, OPTION_MULTIPLE_FILES) + .build(); + + static final PropertyDescriptor INCLUDE_ZERO_RECORD_FLOWFILES = new PropertyDescriptor.Builder() + .name("include-zero-record-flowfiles") + .displayName("Include Zero Record FlowFiles") + .description("When converting an incoming FlowFile, if the conversion results in no data, " + + "this property specifies whether or not a FlowFile will be sent to the corresponding relationship") + .expressionLanguageSupported(ExpressionLanguageScope.NONE) + .allowableValues("true", "false") + .defaultValue("true") + .required(true) + .build(); + + static final PropertyDescriptor RECORD_HASHING_ALGORITHM = new PropertyDescriptor.Builder() + .name("record-hashing-algorithm") + .displayName("Record Hashing Algorithm") + .description("The algorithm used to hash the combined set of resolved RecordPath values for cache storage.") + .allowableValues( + NONE_ALGORITHM_VALUE, + MD5_ALGORITHM_VALUE, + SHA1_ALGORITHM_VALUE, + SHA256_ALGORITHM_VALUE, + SHA512_ALGORITHM_VALUE + ) + .defaultValue(SHA256_ALGORITHM_VALUE.getValue()) + .expressionLanguageSupported(ExpressionLanguageScope.NONE) + .required(true) + .build(); + + static final PropertyDescriptor FILTER_TYPE = new PropertyDescriptor.Builder() + .name("filter-type") + .displayName("Filter Type") + .description("The filter used to determine whether a record has been seen before based on the matching RecordPath criteria.") + .allowableValues( + HASH_SET_VALUE, + BLOOM_FILTER_VALUE + ) + .defaultValue(HASH_SET_VALUE.getValue()) + .dependsOn(DEDUPLICATION_STRATEGY, OPTION_SINGLE_FILE) + .required(true) + .build(); + + static final PropertyDescriptor FILTER_CAPACITY_HINT = new PropertyDescriptor.Builder() + .name("filter-capacity-hint") + .displayName("Filter Capacity Hint") + .description("An estimation of the total number of unique records to be processed. " + + "The more accurate this number is will lead to fewer false negatives on a BloomFilter.") + .defaultValue("25000") + .expressionLanguageSupported(ExpressionLanguageScope.NONE) + .addValidator(StandardValidators.INTEGER_VALIDATOR) + .dependsOn(FILTER_TYPE, BLOOM_FILTER_VALUE) + .required(true) + .build(); + + static final PropertyDescriptor BLOOM_FILTER_FPP = new PropertyDescriptor.Builder() + .name("bloom-filter-certainty") + .displayName("Bloom Filter Certainty") + .description("The desired false positive probability when using the BloomFilter type. " + + "Using a value of .05 for example, guarantees a five-percent probability that the result is a false positive. " + + "The closer to 1 this value is set, the more precise the result at the expense of more storage space utilization.") + .defaultValue("0.10") + .expressionLanguageSupported(ExpressionLanguageScope.NONE) + .addValidator(StandardValidators.NUMBER_VALIDATOR) + .required(false) + .build(); + + + // RELATIONSHIPS + + static final Relationship REL_DUPLICATE = new Relationship.Builder() + .name("duplicate") + .description("Records detected as duplicates in the FlowFile content will be routed to this relationship") + .build(); + + static final Relationship REL_NON_DUPLICATE = new Relationship.Builder() + .name("non-duplicate") + .description("If the record was not found in the cache, it will be routed to this relationship") + .build(); + + static final Relationship REL_ORIGINAL = new Relationship.Builder() + .name("original") + .description("The original input FlowFile is sent to this relationship unless there is a fatal error in the processing.") + .build(); + + static final Relationship REL_FAILURE = new Relationship.Builder() + .name("failure") + .description("If unable to communicate with the cache, the FlowFile will be penalized and routed to this relationship") + .build(); + + private List<PropertyDescriptor> descriptors; + + private Set<Relationship> relationships; + + @Override + protected void init(final ProcessorInitializationContext context) { + final List<PropertyDescriptor> descriptors = new ArrayList<>(); + descriptors.add(DEDUPLICATION_STRATEGY); + descriptors.add(DISTRIBUTED_MAP_CACHE); + descriptors.add(CACHE_IDENTIFIER); + descriptors.add(RECORD_READER); + descriptors.add(RECORD_WRITER); + descriptors.add(INCLUDE_ZERO_RECORD_FLOWFILES); + descriptors.add(RECORD_HASHING_ALGORITHM); + descriptors.add(FILTER_TYPE); + descriptors.add(FILTER_CAPACITY_HINT); + descriptors.add(BLOOM_FILTER_FPP); + this.descriptors = Collections.unmodifiableList(descriptors); + + final Set<Relationship> relationships = new HashSet<>(); + relationships.add(REL_DUPLICATE); + relationships.add(REL_NON_DUPLICATE); + relationships.add(REL_ORIGINAL); + relationships.add(REL_FAILURE); + this.relationships = Collections.unmodifiableSet(relationships); + } + + @Override + public Set<Relationship> getRelationships() { + return this.relationships; + } + + @Override + public final List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return descriptors; + } + + @Override + protected PropertyDescriptor getSupportedDynamicPropertyDescriptor(final String propertyDescriptorName) { + return new PropertyDescriptor.Builder() + .name(propertyDescriptorName) + .description("Specifies a value to use from the record that matches the RecordPath: '" + + propertyDescriptorName + "' which is used together with other specified " + + "record path values to determine the uniqueness of a record. " + + "Expression Language may reference variables 'field.name', 'field.type', and 'field.value' " + + "to access information about the field and the value of the field being evaluated.") Review comment: You brought up a good point about the EL stuff there. I think that's something I missed when merging @adamfisher's PR with mine. Now that I think about it, I think the better way to do this property stuff would be to do it like this: <human_readable> => record path Ex. `firstName => /firstName` That would make it easier to say "hey, we didn't find firstName" instead of throwing a record path statement (which could be long) into the error logs. EL should only be supported on the cache identifier. I can't honestly think of a good use case to give users the flexibility to dynamic define property values on this part with EL. Thoughts? @exceptionfactory what do you think? -- This is an automated message from the Apache Git Service. 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