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emr-serverless-spark-delta-lake-2.0's Introduction

Delta Lake @ AWS EMR Serverless Spark Example

This is a quick minimum viable example for Delta Lake 2.0 running on AWS EMR Serverless Spark, as the Delta Lake project announces the availability of 2.0 open source release and adds fancy features like Z-Order and Change Data Feed.

The example also shows cross data analytics capabilities on AWS by using Athena and Redshift. And the example is use AWS EMR Serverless 6.7.0 where Spark is version 3.2.1.

Notes: Supposed you've already configured AWS EMR Serverless Application, please refer to Getting started with Amazon EMR Serverless for details.

Simple Demo

  1. First upload the script to your S3 bucket.
aws s3 cp ./spark-sql-delta-2-simple.py s3://<your-s3-bucket>/scripts/
  1. Follow Delta Lake Release Link to download delta-core_2.12 and delta-storage jar file, and upload to your S3 bucket.
aws s3 cp ./delta-core_2.12-2.0.0.jar s3://<your-s3-bucket>/
aws s3 cp ./delta-storage-2.0.0.jar s3://<your-s3-bucket>/

Notes: Please remember to download and add delta-storage jar file, otherwise you would encounter error like java.lang.NoClassDefFoundError: io/delta/storage/LogStore

  1. Run the command below to start the job.
aws emr-serverless start-job-run \
    --application-id <your-emr-serverless-application-id> \
    --execution-role-arn <your-emr-serverless-role-arn> \
    --job-driver '{
        "sparkSubmit": {
            "entryPoint": "s3://<your-s3-bucket>/scripts/spark-sql-delta-2-simple.py",
            "entryPointArguments": ["s3://<your-s3-bucket>/delta-lake/output"],
            "sparkSubmitParameters": "
            --conf spark.executor.cores=1 
            --conf spark.executor.memory=4g 
            --conf spark.driver.cores=1 
            --conf spark.driver.memory=4g 
            --conf spark.executor.instances=1 
            --conf spark.default.parallelism=1 
            --conf spark.jars=s3://<your-s3-bucket>/delta-core_2.12-2.0.0.jar,s3://<your-s3-bucket>/delta-storage-2.0.0.jar"
        }
    }' \
    --configuration-overrides '{
        "monitoringConfiguration": {
            "s3MonitoringConfiguration": {
                "logUri": "s3://<your-s3-bucket>/delta-lake-logs/"
            }
        }
    }'
  1. Check the result in S3 bucket.

The data file is written succeesfully: image

Use S3 select to have a quick look at the file: image

Create Table in Glue Catalog

  1. First upload the script to your S3 bucket.
aws s3 cp ./spark-sql-delta-2-create-table.py s3://<your-s3-bucket>/scripts/
  1. Run the command below to start the job.
aws emr-serverless start-job-run \
    --application-id <your-emr-serverless-application-id> \
    --execution-role-arn <your-emr-serverless-role-arn> \
    --job-driver '{
        "sparkSubmit": {
            "entryPoint": "s3://<your-s3-bucket>/scripts/spark-sql-delta-2-create-table.py",
            "entryPointArguments": ["s3://<your-s3-bucket>/delta-lake/deltatb/"],
            "sparkSubmitParameters": "
            --conf spark.executor.cores=1 
            --conf spark.executor.memory=4g 
            --conf spark.driver.cores=1 
            --conf spark.driver.memory=4g 
            --conf spark.executor.instances=1 
            --conf spark.default.parallelism=1 
            --conf spark.jars=s3://<your-s3-bucket>/delta-core_2.12-2.0.0.jar,s3://<your-s3-bucket>/delta-storage-2.0.0.jar"
        }
    }' \
    --configuration-overrides '{
        "monitoringConfiguration": {
            "s3MonitoringConfiguration": {
                "logUri": "s3://<your-s3-bucket>/delta-lake-logs/"
            }
        }
    }'
  1. Check the result in Glue Catalog.

image

Notes: To allow Athena to query the data, _symlink_format_manifest need to be generated. Please refer to Presto, Trino, and Athena to Delta Lake integration using manifests for details. To update manifest file automatically, you could set the table property delta.compatibility.symlinkFormatManifest.enabled=true, please refer to Step 3: Update manifests for details and use spark-sql-delta-2-alter-table.py.

Insert Data into Table in Glue Catalog

  1. First upload the script to your S3 bucket.
aws s3 cp ./spark-sql-delta-2-insert-table.py s3://<your-s3-bucket>/scripts/
  1. Run the command below to start the job.
aws emr-serverless start-job-run \
    --application-id <your-emr-serverless-application-id> \
    --execution-role-arn <your-emr-serverless-role-arn> \
    --job-driver '{
        "sparkSubmit": {
            "entryPoint": "s3://<your-s3-bucket>/scripts/spark-sql-delta-2-insert-table.py",
            "sparkSubmitParameters": "
            --conf spark.executor.cores=1 
            --conf spark.executor.memory=4g 
            --conf spark.driver.cores=1 
            --conf spark.driver.memory=4g 
            --conf spark.executor.instances=1 
            --conf spark.default.parallelism=1 
            --conf spark.jars=s3://<your-s3-bucket>/delta-core_2.12-2.0.0.jar,s3://<your-s3-bucket>/delta-storage-2.0.0.jar"
        }
    }' \
    --configuration-overrides '{
        "monitoringConfiguration": {
            "s3MonitoringConfiguration": {
                "logUri": "s3://<your-s3-bucket>/delta-lake-logs/"
            }
        }
    }'
  1. Check the result in S3 bucket.

image

  1. Query the data via AWS Athena.

First create table for Athena:

CREATE EXTERNAL TABLE "default"."deltatb_athena"(
  `id` int, 
  `name` string, 
  `loc` string)
ROW FORMAT SERDE 
  'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe' 
STORED AS INPUTFORMAT 
  'org.apache.hadoop.hive.ql.io.SymlinkTextInputFormat' 
OUTPUTFORMAT 
  'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
LOCATION
  's3://<your-s3-bucket>/delta-lake/deltatb/_symlink_format_manifest'

Then query the data.

SELECT * FROM "default"."deltatb_athena";

image

Notes: To allow Athena to query the data, _symlink_format_manifest need to be generated and updated. Please refer to Presto, Trino, and Athena to Delta Lake integration using manifests for details.

Upsert Data into Table in Glue Catalog

  1. First upload the script to your S3 bucket.
aws s3 cp ./spark-sql-delta-2-upsert-table.py s3://<your-s3-bucket>/scripts/
  1. Run the command below to start the job.
aws emr-serverless start-job-run \
    --application-id <your-emr-serverless-application-id> \
    --execution-role-arn <your-emr-serverless-role-arn> \
    --job-driver '{
        "sparkSubmit": {
            "entryPoint": "s3://<your-s3-bucket>/scripts/spark-sql-delta-2-upsert-table.py",
            "sparkSubmitParameters": "
            --conf spark.executor.cores=1 
            --conf spark.executor.memory=4g 
            --conf spark.driver.cores=1 
            --conf spark.driver.memory=4g 
            --conf spark.executor.instances=1 
            --conf spark.default.parallelism=1 
            --conf spark.jars=s3://<your-s3-bucket>/delta-core_2.12-2.0.0.jar,s3://<your-s3-bucket>/delta-storage-2.0.0.jar"
        }
    }' \
    --configuration-overrides '{
        "monitoringConfiguration": {
            "s3MonitoringConfiguration": {
                "logUri": "s3://<your-s3-bucket>/delta-lake-logs/"
            }
        }
    }'
  1. Check the result in S3 bucket.

image

  1. Query the data via AWS Athena.
SELECT * FROM "default"."deltatb_athena";

image

Z-ORDER Data into Table in Glue Catalog

  1. First upload the script to your S3 bucket.
aws s3 cp ./spark-sql-delta-2-zorder-table.py s3://<your-s3-bucket>/scripts/
  1. Run the command below to start the job.
aws emr-serverless start-job-run \
    --application-id <your-emr-serverless-application-id> \
    --execution-role-arn <your-emr-serverless-role-arn> \
    --job-driver '{
        "sparkSubmit": {
            "entryPoint": "s3://<your-s3-bucket>/scripts/spark-sql-delta-2-zorder-table.py",
            "sparkSubmitParameters": "
            --conf spark.executor.cores=1 
            --conf spark.executor.memory=4g 
            --conf spark.driver.cores=1 
            --conf spark.driver.memory=4g 
            --conf spark.executor.instances=1 
            --conf spark.default.parallelism=1 
            --conf spark.jars=s3://<your-s3-bucket>/delta-core_2.12-2.0.0.jar,s3://<your-s3-bucket>/delta-storage-2.0.0.jar"
        }
    }' \
    --configuration-overrides '{
        "monitoringConfiguration": {
            "s3MonitoringConfiguration": {
                "logUri": "s3://<your-s3-bucket>/delta-lake-logs/"
            }
        }
    }'
  1. Check the result in S3 bucket.

The files have been optimized and z-ordered, the final file number is optimized to 1 as the test data is quite small. But you can still check the delta log shown as below:

{
  "add": {
    "path": "part-00000-0e8b2e53-360b-4dd1-9b76-e74461999ac7-c000.snappy.parquet",
    "partitionValues": {},
    "size": 1020,
    "modificationTime": 1660391657000,
    "dataChange": false,
    "stats": "{\"numRecords\":8,\"minValues\":{\"id\":1,\"name\":\"alice\",\"loc\":\"bj\"},\"maxValues\":{\"id\":8,\"name\":\"tom\",\"loc\":\"sz\"},\"nullCount\":{\"id\":0,\"name\":0,\"loc\":0}}"
  }
}
{
  "remove": {
    "path": "part-00000-63e08eef-d894-46de-beb4-6d92647c6e05-c000.snappy.parquet",
    "deletionTimestamp": 1660391638300,
    "dataChange": false,
    "extendedFileMetadata": true,
    "partitionValues": {},
    "size": 952
  }
}
{
  "remove": {
    "path": "part-00000-07aa290f-d937-45fc-920b-b2e1ad8e8d0a-c000.snappy.parquet",
    "deletionTimestamp": 1660391638300,
    "dataChange": false,
    "extendedFileMetadata": true,
    "partitionValues": {},
    "size": 981
  }
}
{
  "commitInfo": {
    "timestamp": 1660391659684,
    "operation": "OPTIMIZE",
    "operationParameters": {
      "predicate": "[]",
      "zOrderBy": "[\"loc\"]"
    },
    "readVersion": 4,
    "isolationLevel": "SnapshotIsolation",
    "isBlindAppend": false,
    "operationMetrics": {
      "numRemovedFiles": "2",
      "numRemovedBytes": "1933",
      "p25FileSize": "1020",
      "minFileSize": "1020",
      "numAddedFiles": "1",
      "maxFileSize": "1020",
      "p75FileSize": "1020",
      "p50FileSize": "1020",
      "numAddedBytes": "1020"
    },
    "engineInfo": "Apache-Spark/3.2.1-amzn-0 Delta-Lake/2.0.0",
    "txnId": "1847b6c9-3cf1-4918-b726-968ab91b28aa"
  }
}

The operation is commitInfo is "OPTIMIZE" and its parameter shows "zOrderBy": "["loc"]".

Query Data using Redshift Serverless Spectrum (all cool serverless stuff)

  1. Create external schema which maps to the database created before in Athena.
create external schema athena_schema from data catalog 
database 'default'
iam_role '<your-redshift-role-arn>'
region '<your-region>'
  1. Run the SQL to query the data.
SELECT * FROM "athena_schema"."deltatb_athena" ORDER BY id;

image

Commit Checkpoints

By default, the reference implementation creates a checkpoint every 10 commits. image

CDC Data Handling - Batch (to be updated)

Delta-Lake-CDC-Batch

Sample DMS files to be handled:

I,101,Smith,Bob,4-Jun-14,New York
U,101,Smith,Bob,8-Oct-15,Los Angeles
U,101,Smith,Bob,13-Mar-17,Dallas
D,101,Smith,Bob,13-Mar-17,Dallas

CDC Data Handling - Streaming (to be updated)

Delta-Lake-CDC-Streaming

Sample Debezium stream event to be handled:

{
  "schema": { 
    "type": "struct",
    "fields": [
    ...(omitted)
  },
  "payload": { 
    "op": "c", 
    "ts_ms": 1465491411815, 
    "before": null, 
    "after": { 
      "id": 1004,
      "first_name": "Anne",
      "last_name": "Kretchmar",
      "email": "[email protected]"
    },
    "source": { 
      "version": "1.9.5.Final",
      "connector": "mysql",
      "name": "mysql-server-1",
      "ts_ms": 0,
      "snapshot": false,
      "db": "inventory",
      "table": "customers",
      "server_id": 0,
      "gtid": null,
      "file": "mysql-bin.000003",
      "pos": 154,
      "row": 0,
      "thread": 7,
      "query": "INSERT INTO customers (first_name, last_name, email) VALUES ('Anne', 'Kretchmar', '[email protected]')"
    }
  }
}

CDC Data Handling - All in one (to be updated)

Use EMR for both batch and streaming processing jobs:

Delta-Lake-CDC-All

CDF Change Data Feed (to be updated)

Delta Lake 2.0+ allows users to capture the delta changes after delta.enableChangeDataFeed is enabled. Please refer to the blog How to Simplify CDC With Delta Lake’s Change Data Feed for more details.

cdf_df = spark.read.format("delta") \
         .option("readChangeFeed", "true") \
         .option("startingVersion", 10) \
         .table("default.deltatb")

And spark-sql-delta-2-cdf-table.py is an example for handling the changed part:

{
  "id": 17,
  "name": "opq",
  "loc": "bj",
  "_change_type": "insert",
  "_commit_version": 11,
  "_commit_timestamp": 4.5375430199729815031898112e+25
}
{
  "id": 18,
  "name": "rst",
  "loc": "sz",
  "_change_type": "insert",
  "_commit_version": 11,
  "_commit_timestamp": 4.5375430199729815031898112e+25
}
{
  "id": 19,
  "name": "uvw",
  "loc": "sh",
  "_change_type": "insert",
  "_commit_version": 11,
  "_commit_timestamp": 4.5375430199729815031898112e+25
}

Note: Remember to inlude parameter enableHiveSupport() in spark session~

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