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Posted to issues@nifi.apache.org by GitBox <gi...@apache.org> on 2019/02/19 12:23:12 UTC
[GitHub] MikeThomsen commented on a change in pull request #3317: NIFI-6047
Add DetectDuplicateRecord Processor
MikeThomsen commented on a change in pull request #3317: NIFI-6047 Add DetectDuplicateRecord Processor
URL: https://github.com/apache/nifi/pull/3317#discussion_r258015696
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File path: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/DetectDuplicateRecord.java
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@@ -0,0 +1,620 @@
+/*
+ * 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.*;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+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.*;
+import org.apache.nifi.distributed.cache.client.Deserializer;
+import org.apache.nifi.distributed.cache.client.DistributedMapCacheClient;
+import org.apache.nifi.distributed.cache.client.Serializer;
+import org.apache.nifi.distributed.cache.client.exception.DeserializationException;
+import org.apache.nifi.distributed.cache.client.exception.SerializationException;
+import org.apache.nifi.expression.AttributeExpression.ResultType;
+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.*;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+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.schema.access.SchemaNotFoundException;
+import org.apache.nifi.serialization.*;
+import org.apache.nifi.serialization.record.Record;
+import org.apache.nifi.serialization.record.RecordSchema;
+
+import java.io.*;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+import static java.util.stream.Collectors.toList;
+import static org.apache.commons.codec.binary.StringUtils.getBytesUtf8;
+import static org.apache.commons.lang3.StringUtils.*;
+
+@EventDriven
+@SupportsBatching
+@InputRequirement(Requirement.INPUT_REQUIRED)
+@SystemResourceConsideration(resource = SystemResource.MEMORY,
+ description = "Caches records from each incoming FlowFile and determines if the cached record has " +
+ "already been seen. The name of user-defined properties determines the RecordPath values used to " +
+ "determine if a record is unique. If no user-defined properties are present, the entire record is " +
+ "used as the input to determine uniqueness. All duplicate records are routed to 'duplicate'. " +
+ "If the record is not determined to be a duplicate, the Processor routes the record to 'non-duplicate'.")
+@Tags({"text", "record", "update", "change", "replace", "modify", "distinct", "unique",
+ "filter", "hash", "dupe", "duplicate", "dedupe"})
+@CapabilityDescription("Caches records from each incoming FlowFile and determines if the cached record has " +
+ "already been seen. The name of user-defined properties determines the RecordPath values used to " +
+ "determine if a record is unique. If no user-defined properties are present, the entire record is " +
+ "used as the input to determine uniqueness. All duplicate records are routed to 'duplicate'. " +
+ "If the record is not determined to be a duplicate, the Processor routes the record to 'non-duplicate'."
+)
+@ReadsAttributes({@ReadsAttribute(attribute="", description="")})
+@WritesAttributes({
+ @WritesAttribute(attribute = "record.count", description = "The number of records in the FlowFile")
+})
+@DynamicProperty(
+ name = "RecordPath",
+ value = "User-defined property values are ignored",
+ 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 DetectDuplicateRecord extends AbstractProcessor {
+
+ private volatile RecordPathCache recordPathCache;
+ private volatile List<String> recordPaths;
+
+ // VALUES
+
+ 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 ENTIRE_RECORD_VALUE = new AllowableValue("entire-record", "Entire Record",
+// "All field values of a record are used in the order they are listed in the incoming FlowFile to determine if two records are equal.");
+// static final AllowableValue RECORD_PATH_VALUE = new AllowableValue("entire-record", "Entire Record",
+// "The user-defined RecordPath properties are used in the specified order to determine whether two records are equal. " +
+// "If the value of a RecordPath is modified or the ordering of the user-defined RecordPath properties change " +
+// "after processing one or more FlowFiles, duplicate detection is effectively reset.");
+
+ static final AllowableValue HASH_SET_VALUE = new AllowableValue("hash-set", "HashSet",
+ "Exactly matches records seen before with 100% accuracy at the expense of more memory usage. " +
+ "This is not ideal for large files since a hash of each record is held in memory.");
+ static final AllowableValue BLOOM_FILTER_VALUE = new AllowableValue("bloom-filter", "BloomFilter",
+ "Space-efficient data structure ideal for large data sets uses probability to determine if a record was seen before. " +
+ "False positive matches are possible, but false negatives are not – in other words, a query returns either \"possibly in set\" or \"definitely not in set\". " +
+ "You should use this option if the FlowFile content is large and you can tolerate some duplication in the data.");
+
+
+ // 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 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 CACHE_IDENTIFIER = new PropertyDescriptor.Builder()
+ .name("Cache The Entry Identifier")
+ .description("When true this cause the processor to check for duplicates and cache the Entry Identifier. When false, "
+ + "the processor would only check for duplicates and not cache the Entry Identifier, requiring another "
+ + "processor to add identifiers to the distributed cache.")
+ .required(true)
+ .allowableValues("true", "false")
+ .defaultValue("true")
+ .build();
+
+ static final PropertyDescriptor DISTRIBUTED_CACHE_SERVICE = new PropertyDescriptor.Builder()
+ .name("Distributed Cache Service")
+ .description("The Controller Service that is used to cache unique records, used to determine duplicates")
+ .required(false)
+ .identifiesControllerService(DistributedMapCacheClient.class)
+ .build();
+
+ static final PropertyDescriptor CACHE_ENTRY_IDENTIFIER = new PropertyDescriptor.Builder()
+ .name("Cache Entry Identifier")
+ .description(
+ "A FlowFile attribute, or the results of an Attribute Expression Language statement, which will be evaluated " +
+ "against a FlowFile in order to determine the cached filter type value used to identify duplicates.")
+ .required(false)
+ .addValidator(StandardValidators.createAttributeExpressionLanguageValidator(ResultType.STRING, true))
+ .defaultValue("${hash.value}")
+ .expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
+ .build();
+
+ static final PropertyDescriptor AGE_OFF_DURATION = new PropertyDescriptor.Builder()
+ .name("Age Off Duration")
+ .description("Time interval to age off cached filters. When the cache expires, the entire filter and its values " +
+ "are destroyed. Leaving this value empty will cause the cached entries to never expire.")
+ .required(false)
+ .addValidator(StandardValidators.TIME_PERIOD_VALIDATOR)
+ .build();
+
+ static final PropertyDescriptor RECORD_HASHING_ALGORITHM = new PropertyDescriptor.Builder()
+ .name("Record Hashing Algorithm")
+ .description("The algorithm used to hash the combined result of RecordPath values in the cache.")
+ .allowableValues(
+ MD5_ALGORITHM_VALUE,
+ SHA1_ALGORITHM_VALUE,
+ SHA256_ALGORITHM_VALUE,
+ SHA512_ALGORITHM_VALUE
+ )
+ .defaultValue(SHA1_ALGORITHM_VALUE.getValue())
+ .expressionLanguageSupported(ExpressionLanguageScope.NONE)
+ .required(true)
+ .build();
+
+ static final PropertyDescriptor FILTER_TYPE = new PropertyDescriptor.Builder()
+ .name("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())
+ .required(true)
+ .build();
+
+ static final PropertyDescriptor FILTER_CAPACITY_HINT = new PropertyDescriptor.Builder()
+ .name("Filter Capacity Hint")
+ .description("An estimation of the total number of unique records to be processed. " +
+ "The more accurate this number is leads to less resizing operations on a HashSet filter and fewer false negatives on a BloomFilter. " +
+ "Using the CountText processor block first and then using the ${text.line.count} attribute may be ideal for more dynamic estimates.")
+ .defaultValue("25000")
+ .expressionLanguageSupported(ExpressionLanguageScope.NONE)
+ .addValidator(StandardValidators.INTEGER_VALIDATOR)
+ .required(true)
+ .build();
+
+ static final PropertyDescriptor BLOOM_FILTER_FPP = new PropertyDescriptor.Builder()
+ .name("BloomFilter Probability")
+ .description("The desired false positive probability when using the BloomFilter filter type. " +
Review comment:
Also, on the documentation side you need to make it explicit to users that there is a possibility that there can be false positives if they choose this trade off.
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