Fully Distributed CIDACS-RL
The CIDACS-RL is a brazillian record linkage tool suitable to integrate large amount of data with high accuracy. However, its current implementation relies on a ElasticSearch Cluster to distribute the queries and a single node to perform them through Python Multiprocessing lib. This implementation of CIDACS-RL tool can be deployed in a Spark Cluster using all resources available by Jupyter Kernel still using the ElasticSearch cluster, becaming a fully distributed and cluster based solution. It can outperform the legacy version of CIDACS-RL either on multi-node or single node Spark Environment.
config.json
Almost all the aspects of the linkage can be manipulated by the config.json file.
| Section | Sub-section | Field (datatype) | Field description |
|---|---|---|---|
| General info | index_data (str<'yes', 'no'>) | This flag says if the linkage process includes the indexing of a data set into elastic search. Constraints: string, it can assume the values "yes" or "no". | |
| General info | es_index_name (str<ES_VALID_INDEX>) | The name of an existing elasticsearch index (if index_data is 'no') or a new one (if index_data is 'yes'). Constraints: string, elasticsearch valid. | |
| General info | es_connect_string (str<ES_URL:ES_PORT>) | Elasticsearch API address. Constraints: string, URL format. | |
| General info | query_size (int) | Number of candidates output for each Elasticsearch query. Constraints: int. | |
| General info | cutoff_exact_match (str<0:1 number>) | Cutoff point to determine wether a pair is an exact match or not. Constraints: str, number between 0 and 1. | |
| General info | null_value (str) | Value to replace missings on both data sets involved. Constraints: string. | |
| General info | temp_dir (str) | Directory used to write checkpoints for exact match and non-exact match phases. Constraints: string, fully qualified path. | |
| General info | debug (str<'true', 'false'>) | If it is set as "true", all records found on exact match will be queried again on non-exact match phase. | |
| Datasets info | Indexed dataset | path (str) | Path for csv or parquet folder of dataset to index. |
| Datasets info | Indexed dataset | extension (str<'csv', 'parquet'>) | String to determine the type of data reading on Spark. |
| Datasets info | Indexed dataset | columns (list) | Python list with column names involved on linkage. |
| Datasets info | Indexed dataset | id_column_name (str) | Name of id column. |
| Datasets info | Indexed dataset | storage_level (str<'MEMORY_AND_DISK', 'MEMORY_ONLY'>) | Directive for memory allocation on Spark. |
| Datasets info | Indexed dataset | default_paralelism (str<4*N_OF_AVAILABLE_CORES>) | Number of partitions of a given Spark dataframe. |
| Datasets info | tolink dataset | path (str) | Path for csv or parquet folder of dataset to index. |
| Datasets info | tolink dataset | extension (str<'csv', 'parquet'>) | String to determine the type of data reading on Spark. |
| Datasets info | tolink dataset | columns (list) | Python list with column names involved on linkage. |
| Datasets info | tolink dataset | id_column_name (str) | Name of id column. |
| Datasets info | tolink dataset | storage_level (str<'MEMORY_AND_DISK', 'MEMORY_ONLY'>) | Directive for memory allocation on Spark. |
| Datasets info | tolink dataset | default_paralelism (str<4*N_OF_AVAILABLE_CORES>) | Number of partitions of a given Spark dataframe. |
| Datasets info | result dataset | path (str) | Path for csv or parquet folder of dataset to index. |
| Comparisons | label1 | indexed_col (str) | Name of first column to be compared on indexed dataset |
| Comparisons | label1 | tolink_col (str) | Name of first column to be compared on tolink dataset |
| Comparisons | label1 | must_match (str<'true', 'false'>) | Set if this pair of columns are included on exact match phase |
| Comparisons | label1 | should_match (str<'true', 'false'>) | Set if this pair of columns are included on non-exact match phase |
| Comparisons | label1 | is_fuzzy (str<'true', 'false'>) | Set if this pair of columns are included on fuzzy queries for non-exact match phase |
| Comparisons | label1 | boost (str) | Set the boost/weight of this pair of columns on queries |
| Comparisons | label1 | query_type (str<'match', 'term'>) | Set the type of matching for this pair of columns on non-exact match phase |
| Comparisons | label1 | similarity (str<'jaro_winkler', 'overlap', 'hamming'> | Set the similarity to be calculated between the values of this pair of columns |
| Comparisons | label1 | weight (str) | Set the weight of this pair of columns. |
| Comparisons | label1 | penalty (str) | Set the penalty of the overall similarity in case of missing value(s). |
| Comparisons | label2 | ... | ... |
config.json example
{
'index_data': 'no',
'es_index_name': 'fd-cidacs-rl',
'es_connect_string': 'http://localhost:9200',
'query_size': 100,
'cutoff_exact_match': '0.95',
'null_value': '99',
'temp_dir': '../../../0_global_data/fd-cidacs-rl/temp_dataframe/',
'debug': 'false',
'datasets_info': {
'indexed_dataset': {
'path': '../../../0_global_data/fd-cidacs-rl/sinthetic-dataset-A.parquet',
'extension': 'parquet',
'columns': ['id_cidacs_a', 'nome_a', 'nome_mae_a', 'dt_nasc_a', 'sexo_a'],
'id_column_name': 'id_cidacs_a',
'storage_level': 'MEMORY_ONLY',
'default_paralelism': '16'},
'tolink_dataset': {
'path': '../../../0_global_data/fd-cidacs-rl/sinthetic-datasets-b/sinthetic-datasets-b-500000.parquet',
'extension': 'parquet',
'columns': ['id_cidacs_b', 'nome_b', 'nome_mae_b', 'dt_nasc_b', 'sexo_b'],
'id_column_name': 'id_cidacs_b',
'storage_level': 'MEMORY_ONLY',
'default_paralelism': '16'},
'result_dataset': {
'path': '../0_global_data/result/500000/'}},
'comparisons': {
'name': {
'indexed_col': 'nome_a',
'tolink_col': 'nome_b',
'must_match': 'true',
'should_match': 'true',
'is_fuzzy': 'true',
'boost': '3.0',
'query_type': 'match',
'similarity': 'jaro_winkler',
'weight': 5.0,
'penalty': 0.02},
'mothers_name': {
'indexed_col': 'nome_mae_a',
'tolink_col': 'nome_mae_b',
'must_match': 'true',
'should_match': 'true',
'is_fuzzy': 'true',
'boost': '2.0',
'query_type': 'match',
'similarity': 'jaro_winkler',
'weight': 5.0,
'penalty': 0.02},
'birthdate': {
'indexed_col': 'dt_nasc_a',
'tolink_col': 'dt_nasc_b',
'must_match': 'false',
'should_match': 'true',
'is_fuzzy': 'false',
'boost': '',
'query_type': 'term',
'similarity': 'hamming',
'weight': 1.0,
'penalty': 0.02},
'sex': {
'indexed_col': 'sexo_a',
'tolink_col': 'sexo_b',
'must_match': 'true',
'should_match': 'true',
'is_fuzzy': 'false',
'boost': '',
'query_type': 'term',
'similarity': 'overlap',
'weight': 3.0,
'penalty': 0.02}}}
Running in a Standalone Spark Cluster
Read more: https://github.com/elastic/elasticsearch-hadoop https://www.elastic.co/guide/en/elasticsearch/hadoop/current/spark.html https://search.maven.org/artifact/org.elasticsearch/elasticsearch-spark-30_2.12 If you intend to run this tool into a single node Spark environment, consider to include this in you spark-submit or spark-shell command line
pyspark --packages org.elasticsearch:elasticsearch-spark-30_2.12:7.14.0 --conf spark.es.nodes="localhost" --conf spark.es.port="9200"
If you are running into a Spark Cluster under JupyterHUB kernels, try to add this kernel or edit an existing one:
{
"display_name": "Spark3.3",
"language": "python",
"argv": [
"/opt/bigdata/anaconda3/bin/python",
"-m",
"ipykernel",
"-f",
"{connection_file}"
],
"env": {
"SPARK_HOME": "/opt/bigdata/spark",
"PYTHONPATH": "/opt/bigdata/spark/python:/opt/bigdata/spark/python/lib/py4j-0.10.9.2-src.zip",
"PYTHONSTARTUP": "/opt/bigdata/spark/python/pyspark/python/pyspark/shell.py",
"PYSPARK_PYTHON": "/opt/bigdata/anaconda3/bin/python",
"PYSPARK_SUBMIT_ARGS": "--master spark://node1.sparkcluster:7077 --packages org.elasticsearch:elasticsearch-spark-30_2.12:7.14.0 --conf spark.es.nodes=['node1','node2'] --conf spark.es.port='9200' pyspark-shell"
}
}
Some advices for indexed data and queries
- Every col should be casted as string (df.withColumn('column', F.col('column').cast(string')))
- Date type columns will not be proper indexed as string, except if some preprocessing step tranform it from yyyy-MM-dd to yyyyMMdd.
- All the nodes of elasticsearch cluster must be included on --packages configuration.
- Term queries are good to well structured variables, such as CPF, dates, CNPJ, etc.
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