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Posted to issues@nifi.apache.org by GitBox <gi...@apache.org> on 2019/06/21 17:03:10 UTC
[GitHub] [nifi] mattyb149 commented on a change in pull request #3317:
NIFI-6047 Add DetectDuplicateRecord Processor
mattyb149 commented on a change in pull request #3317: NIFI-6047 Add DetectDuplicateRecord Processor
URL: https://github.com/apache/nifi/pull/3317#discussion_r296306386
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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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+/*
+ * 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 org.apache.nifi.serialization.record.util.DataTypeUtils;
+
+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 = "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.")
+@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 record " +
+ "has already been seen. If so, routes the record to 'duplicate'. If the record is " +
+ "not determined to be a duplicate, it is routed to 'non-duplicate'."
+)
+@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 availble: ${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 DetectDuplicateRecord 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 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")
+ .displayName("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")
+ .displayName("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")
+ .displayName("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")
+ .displayName("Age Off Duration")
+ .description("Time interval to age off cached filter entries. When the cache expires, the entire filter and its values " +
+ "are destroyed. Leaving this value empty will cause the cached entries to never expire but may eventually be rotated " +
+ "out when the cache servers rotation policy automatically expires entries.")
+ .required(false)
+ .addValidator(StandardValidators.TIME_PERIOD_VALIDATOR)
+ .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(SHA1_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())
+ .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)
+ .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)
Review comment:
Any reason why we couldn't support Expression Language for this? You're creating the Bloom filter on each execution, so you could support EL with FlowFile attributes, you'd just have to duplicate the logic in `customValidate` into `onTrigger` as well. In `customValidate` you'd check to see `isExpressionLanguagePresent()` and if so, skip the validation (for now), it would happen again at runtime.
If instead you intended to have the value be more or less static, you could still support Expression Language for the Variable Registry, and save off this value (after EL evaluation) in `OnScheduled` for use in the Bloom filter later. I have the same comments about `Filter Capacity Hint`. One option (if you do the same there) is to create the Bloom filter ahead of time, unless each thread needs its own of course. Even in that case, you can evaluate the properties ahead of time (against the Variable Registry) and use them in `onTrigger` when you create the Bloom filter.
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