Implementing Glue ETL job with Job Bookmarks

AWS Glue is a fully managed ETL service to load large amounts of datasets from various sources for analytics and data processing with Apache Spark ETL jobs. In this post I will discuss the use of AWS Glue Job Bookmarks feature in the following architecture. AWS Glue Job Bookmarks help Glue maintain state information of … Continue reading Implementing Glue ETL job with Job Bookmarks

Aurora MySQL – Export data to S3

Using SELECT INTO OUTFILE S3 you can query data from an Aurora MySQL DB cluster and save it directly into text files stored in S3 bucket. 1. Create an IAM policy for S3. { "Version": "2012-10-17", "Statement": [ { "Sid": "VisualEditor0", "Effect": "Allow", "Action": [ "s3:DeleteObject", "s3:GetBucketLocation", "s3:GetObject", "s3:ListBucket", "s3:ListBucketMultipartUploads", "s3:PutObject" ], "Resource": [ "arn:aws:s3:::bucket-name", … Continue reading Aurora MySQL – Export data to S3

Reading Parquet files with AWS Lambda

I had a use case to read data (few columns) from parquet file stored in S3, and write to DynamoDB table, every time a file was uploaded. Thinking to use AWS Lambda, I was looking at options of how to read parquet files within lambda until I stumbled upon AWS Data Wrangler. From the document … Continue reading Reading Parquet files with AWS Lambda

AWS Glue – Querying Nested JSON with Relationalize Transform

AWS Glue has transform Relationalize that can convert nested JSON into columns that you can then write to S3 or import into relational databases. As an example - Initial Schema: >>> df.printSchema() root |-- Id: string (nullable = true) |-- LastUpdated: long (nullable = true) |-- LastUpdatedBy: string (nullable = true) |-- Properties: struct (nullable … Continue reading AWS Glue – Querying Nested JSON with Relationalize Transform

Redshift: Convert TEXT to Timestamp

How do you convert TEXT to timestamp in redshift? If the score column has data in given format, how can you display the timestamp. {"Choices":null, "timestamp":"1579650266955", "scaledScore":null} select cast(json_extract_path_text(score, 'timestamp') as timestamp) from schema.table limit 10; This sql will fail with -- ERROR: Invalid data DETAIL: ----------------------------------------------- error: Invalid data code: 8001 context: Invalid format … Continue reading Redshift: Convert TEXT to Timestamp