AWS Glue ETL : transfer data to S3 Bucket - amazon-web-services

I wish to transfer data in a database like MySQL[RDS] to S3 using AWS Glue ETL.
I am having difficulty trying to do this the documentation is really not good.
I found this link here on stackoverflow:
Could we use AWS Glue just copy a file from one S3 folder to another S3 folder?
SO based on this link, it seems that Glue does not have an S3 bucket as a data Destination, it may have it as a data Source.
SO, i hope i am wrong on this.
BUT if one makes an ETL tool, one of the first basics on AWS is for it to tranfer data to and from an S3 bucket, the major form of storage on AWS.
So hope someone can help on this.

You can add a Glue connection to your RDS instance and then use the Spark ETL script to write the data to S3.
You'll have to first crawl the database table using Glue Crawler. This will create a table in the Data Catalog which can be used in the job to transfer the data to S3. If you do not wish to perform any transformation, you may directly use the UI steps for autogenerated ETL scripts.
I have also written a blog on how to Migrate Relational Databases to Amazon S3 using AWS Glue. Let me know if it addresses your query.
https://ujjwalbhardwaj.me/post/migrate-relational-databases-to-amazon-s3-using-aws-glue

Have you tried https://docs.aws.amazon.com/datapipeline/latest/DeveloperGuide/dp-template-copyrdstos3.html?
You can use AWS Data Pipeline - it has standard templates for full as well incrementation copy to s3 from RDS.

Related

AWS glue job (Pyspark) to AWS glue data catalog

We know that,
the procedure of writing from pyspark script (aws glue job) to AWS data catalog is to write in s3 bucket (eg.csv) use a crawler and schedule it.
Is there any other way of writing to aws glue data catalog?
I am looking for a direct way to do this.Eg. writing as a s3 file and sync to the aws glue data catalog.
You may manually specify the table. The crawler only discovers the schema. If you set the schema manually, you should be able to read your data when you run the AWS Glue Job.
We have had this same problem for one of our customers who had millions of small files within AWS S3. The crawler practically would stall and not proceed and continue to run infinitely. We came up with the following alternative approach :
A Custom Glue Python Shell job was written which leveraged AWS Wrangler to fire queries towards AWS Athena.
The Python Shell job would List the contents of folder s3:///event_date=<Put the Date Here from #2.1>
The queries fired :
alter table add partition (event_date='<event_date from above>',eventname=’List derived from above S3 List output’)
4. This was triggered to run post the main Ingestion Job via Glue Workflows.
If you are not expecting schema to change, use Glue job directly after creating manually tables using Glue Database and Table.

AWS ETL Job to write data to s3 bucket in csv format

I am completly new to AWS, and need your support to point me to right direction on my requirement.
Requirement:
I need to read multiple csv files from s3 bucket, union the data perform some transformation and load it to another s3 bucket.
Issue:
I understand that Lambda is one of the option to do the same, but the data is huge so i belive at somepoint 15min limitation will be a issue to me.
Also for Glue ETL, fom what i read i understand it does suport the output to be s3.
Ask
Could you suggest any other ELT services and the link to help me get started.

Build s3 Datalake Using Dynamo DB data source

i'am a data engineer using AWS, we want to build a data pipeline in order to visualise our Dynmaodb data on QuickSigth, as u know, it's not possible de connect directly dynamo to Quick...u have to pass by S3.
S3 Will be our datalake, the issue is that the date updates frequently (for exemple column named can change / costumer status can evolve..)
So i'am looking for a batch solution in order to always get the lastest data from dynamo on my s3 datalake and visualise it in quicksigth.
Thank u
You can access your tables at DynamoDB, in the console, and export data to S3 under the Streams and Exports tab. This blog post from AWS explains just what you need.
You could also try this approach with Athena instead of S3.

What is the most optimal way to automate data (csv file) transfer from s3 to Redshift without AWS Pipeline?

I am trying to take sql data stored in a csv file in an s3 bucket and transfer the data to AWS Redshift and automate that process. Would writing etl scripts with lambda/glue be the best way to approach this problem, and if so, how do I get the script/transfer to run periodically? If not, what would be the most optimal way to pipeline data from s3 to Redshift.
Tried using AWS Pipeline but that is not available in my region. I also tried to use the AWS documentation for Lambda and Glue but don't know where to find the exact solution to the problem
All systems (including AWS Data Pipeline) use the Amazon Redshift COPY command to load data from Amazon S3.
Therefore, you could write an AWS Lambda function that connects to Redshift and issues the COPY command. You'll need to include a compatible library (eg psycopg2) to be able to call Redshift.
You can use Amazon CloudWatch Events to call the Lambda function on a regular schedule. Or, you could get fancy and configure Amazon S3 Events so that, when a file is dropped in an S3 bucket, it automatically triggers the Lambda function.
If you don't want to write it yourself, you could search for existing code on the web, including:
The very simply Python-based christianhxc/aws-lambda-redshift-copy: AWS Lambda function that runs the copy command into Redshift
A more fully-featured node-based A Zero-Administration Amazon Redshift Database Loader | AWS Big Data Blog

Periodically moving query results from Redshift to S3 bucket

I have my data in a table in Redshift cluster. I want to periodically run a query against the Redshift table and store the results in a S3 bucket.
I will be running some data transformations on this data in the S3 bucket to feed into another system. As per AWS documentation I can use the UNLOAD command, but is there a way to schedule this periodically? I have searched a lot but I haven't found any relevant information around this.
You can use a scheduling tool like Airflow to accomplish this task. Airflow seem-lessly connects to Redshift and S3. You can have a DAG action, which polls Redshift periodically and unloads the data from Redshift onto S3.
I don't believe Redshift has the ability to schedule queries periodically. You would need to use another service for this. You could use a Lambda function, or you could schedule a cron job on an EC2 instance.
I believe you are looking for AWS data pipeline service.
You can copy data from redshift to s3 using the RedshiftCopyActivity (http://docs.aws.amazon.com/datapipeline/latest/DeveloperGuide/dp-object-redshiftcopyactivity.html).
I am copying the relevant content from the above URL for future purposes:
"You can also copy from Amazon Redshift to Amazon S3 using RedshiftCopyActivity. For more information, see S3DataNode.
You can use SqlActivity to perform SQL queries on the data that you've loaded into Amazon Redshift."
Let me know if this helped.
You should try AWS Data Pipelines. You can schedule them to run periodically or on demand. I am confident that it would solve your use case